Articles de revues : « Mie resonator »

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Lubatsch, Andreas, et Regine Frank. « Quantum Many-Body Theory for Exciton-Polaritons in Semiconductor Mie Resonators in the Non-Equilibrium ». Applied Sciences 10, n^o 5 (6 mars 2020) : 1836. http://dx.doi.org/10.3390/app10051836.

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We implement externally excited ZnO Mie resonators in a framework of a generalized Hubbard Hamiltonian to investigate the lifetimes of excitons and exciton-polaritons out of thermodynamical equilibrium. Our results are derived by a Floquet-Keldysh-Green’s formalism with Dynamical Mean Field Theory (DMFT) and a second order iterative perturbation theory solver (IPT). We find that the Fano resonance which originates from coupling of the continuum of electronic density of states to the semiconductor Mie resonator yields polaritons with lifetimes between 0.6 ps and 1.45 ps. These results are compared to ZnO polariton lasers and to ZnO random lasers. We interpret the peaks of the exciton-polariton lifetimes in our results as a sign of gain narrowing which may lead to stable polariton lasing modes in the single excited ZnO Mie resonator. This form of gain may lead to polariton random lasing in an ensemble of ZnO Mie resonators in the non-equilibrium.

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Lan, Jun, Yunpeng Liu, Tao Wang, Yifeng Li et Xiaozhou Liu. « Acoustic coding metamaterial based on non-uniform Mie resonators ». Applied Physics Letters 120, n^o 16 (18 avril 2022) : 163501. http://dx.doi.org/10.1063/5.0071897.

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Acoustic coding metamaterials have important applications in simplifying design procedure and providing a flexible approach to realize complicated functions. Here, we design a 1-bit coding metamaterial for flexibly manipulating the sound propagation path. The capability of subwavelength acoustic propagation control on coding metamaterial is attributed to the dipole-like characteristic of the Mie resonator. The Mie resonator with a subwavelength scale is constructed with a non-uniform structure, which can generate Mie resonance with dipole-like characteristic. Two kinds of coding elements are introduced by horizontally or vertically reversing the Mie resonator in each element. To verify the performance of the designed coding metamaterials, three specific metamaterial patterns are fabricated to give different trajectories of sound propagation. Our finding may open an avenue for designing acoustic metamaterials and is expected to design intelligent acoustic devices with exciting reconfigurable and programmable applications.

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Koshelev, Kirill, Sergey Kruk, Elizaveta Melik-Gaykazyan, Jae-Hyuck Choi, Andrey Bogdanov, Hong-Gyu Park et Yuri Kivshar. « Subwavelength dielectric resonators for nonlinear nanophotonics ». Science 367, n^o 6475 (16 janvier 2020) : 288–92. http://dx.doi.org/10.1126/science.aaz3985.

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Subwavelength optical resonators made of high-index dielectric materials provide efficient ways to manipulate light at the nanoscale through mode interferences and enhancement of both electric and magnetic fields. Such Mie-resonant dielectric structures have low absorption, and their functionalities are limited predominantly by radiative losses. We implement a new physical mechanism for suppressing radiative losses of individual nanoscale resonators to engineer special modes with high quality factors: optical bound states in the continuum (BICs). We demonstrate that an individual subwavelength dielectric resonator hosting a BIC mode can boost nonlinear effects increasing second-harmonic generation efficiency. Our work suggests a route to use subwavelength high-index dielectric resonators for a strong enhancement of light–matter interactions with applications to nonlinear optics, nanoscale lasers, quantum photonics, and sensors.

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Yan, Jiahao, Churong Ma, Yingcong Huang et Guowei Yang. « Single silicon nanostripe gated suspended monolayer and bilayer WS2 to realize abnormal electro-optical modulation ». Materials Horizons 6, n^o 2 (2019) : 334–42. http://dx.doi.org/10.1039/c8mh01009a.

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Zeng, Lizhen, Yuting Yang et Gongli Xiao. « An All-Dielectric Color Filter, with a Wider Color Gamut ». Photonics 9, n^o 10 (21 septembre 2022) : 680. http://dx.doi.org/10.3390/photonics9100680.

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Due to their extraordinary abilities to manipulate light propagation at the nanoscale, dielectric resonators that generate electric and magnetic Mie resonances for minimal optical loss have recently attracted great interest. Based on an all-dielectric metasurface, made of H-type silicon nanoarrays, this study proposed and constructed a visible-wavelength-range color filter, with high-quality Mie resonance and the ability to synthesize new colors. Using the finite-difference time-domain (FDTD) approach, we can create a larger color gamut by modifying the H-type array’s structural properties. The all-dielectric color filter suggested has a high color saturation and narrow bandwidth. The Mie resonance can be adjusted by manipulating the structural characteristics. By translating the reflectance spectrum into color coordinates and using the CIE1931 chromaticity diagram, a wide range of colors can be generated. This color filter offers a larger color range and saturation than other color filters. We produced color passband filters that span the visible spectrum using Mie resonator arrays, based on an H-type nanoresonator. This technology could have many applications, including high-resolution color printing, color-tunable switches, and sensing systems.

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Roy, Arijit Bardhan, Sonali Das, Avra Kundu, Chandan Banerjee et Nillohit Mukherjee. « c-Si/n-ZnO-based flexible solar cells with silica nanoparticles as a light trapping metamaterial ». Physical Chemistry Chemical Physics 19, n^o 20 (2017) : 12838–44. http://dx.doi.org/10.1039/c7cp01128h.

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Kang, Jiwon, Young Jin Yoo, Joo Hwan Ko, Abdullah Al Mahmud et Young Min Song. « Trilayered Gires–Tournois Resonator with Ultrasensitive Slow-Light Condition for Colorimetric Detection of Bioparticles ». Nanomaterials 13, n^o 2 (12 janvier 2023) : 319. http://dx.doi.org/10.3390/nano13020319.

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Over the past few decades, advances in various nanophotonic structures to enhance light–matter interactions have opened numerous opportunities for biosensing applications. Beyond the successful development of label-free nanophotonic biosensors that utilize plasmon resonances in metals and Mie resonances in dielectrics, simpler structures are required to achieve improved sensor performance and multifunctionality, while enabling cost-effective fabrication. Here, we present a simple and effectual approach to colorimetric biosensing utilizing a trilayered Gires–Tournois (GT) resonator, which provides a sensitive slow-light effect in response to low refractive index (RI) substances and thus enables to distinguish low RI bioparticles from the background with spatially distinct color differences. For low RI sensitivity, by impedance matching based on the transmission line model, trilayer configuration enables the derivation of optimal designs to achieve the unity absorption condition in a low RI medium, which is difficult to obtain with the conventional GT configuration. Compared to conventional bilayered GT resonators, the trilayered GT resonator shows significant sensing performance with linear sensitivity in various situations with low RI substances. For extended applications, several proposed designs of trilayered GT resonators are presented in various material combinations by impedance matching using equivalent transmission line models. Further, comparing the color change of different substrates with low RI NPs using finite-difference time-domain (FDTD) simulations, the proposed GT structure shows surpassing colorimetric detection.

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Lewi, Tomer, Nikita A. Butakov et Jon A. Schuller. « Thermal tuning capabilities of semiconductor metasurface resonators ». Nanophotonics 8, n^o 2 (28 novembre 2018) : 331–38. http://dx.doi.org/10.1515/nanoph-2018-0178.

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AbstractMetasurfaces exploit optical phase, amplitude, and polarization engineering at subwavelength dimensions to achieve unprecedented control of light. The realization of all dielectric metasurfaces has led to low-loss flat optical elements with functionalities that cannot be achieved with metal elements. However, to reach their ultimate potential, metasurfaces must move beyond static operation and incorporate active tunability and reconfigurable functions. The central challenge is achieving large tunability in subwavelength resonator elements, which requires large optical effects in response to external stimuli. Here we study the thermal tunability of high-index silicon and germanium semiconductor resonators over a large temperature range. We demonstrate thermal tuning of Mie resonances due to the normal positive thermo-optic effect (dn/dT>0) over a wide infrared range. We show that at higher temperatures and longer wavelengths, the sign of the thermo-optic coefficient is reversed, culminating in a negative induced index due to thermal excitation of free carriers. We also demonstrate the tuning of high-order Mie resonances by several linewidths with a temperature swing of ΔT<100 K. Finally, we exploit the large near-infrared thermo-optic coefficient in Si metasurfaces to realize optical switching and tunable metafilters.

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Wood, Thomas, Meher Naffouti, Johann Berthelot, Thomas David, Jean-Benoît Claude, Léo Métayer, Anne Delobbe et al. « All-Dielectric Color Filters Using SiGe-Based Mie Resonator Arrays ». ACS Photonics 4, n^o 4 (27 mars 2017) : 873–83. http://dx.doi.org/10.1021/acsphotonics.6b00944.

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Jacobsen, Rasmus E., Andrei V. Lavrinenko et Samel Arslanagić. « Reconfigurable dielectric resonators with imbedded impedance surfaces—From enhanced and directional to suppressed scattering ». Applied Physics Letters 122, n^o 8 (20 février 2023) : 081701. http://dx.doi.org/10.1063/5.0139695.

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Resonant elements play a vital role in tailoring of the radiation and scattering properties of devices, such as antennas and functional material platforms. We presently demonstrate a simple resonator that supports a multitude of scattering states. The resonator is a hybrid structure consisting of a finite-height dielectric cylinder integrated with a concentric impedance surface. Given its simple configuration, we apply the classical Lorentz–Mie theory to analyze its scattering properties analytically. Through a careful tuning of its geometry, the resonator is found to support enhanced and directive scattering states as well as the suppressed scattering states also known as anapole states. A prototype of the resonator has been built and tested at microwave frequencies. It utilizes water as the dielectric and a metallic tube with periodic slits as the impedance surface. Exploiting the flexibility of water, the design is easily reconfigured for different scattering responses: fully filled, the resonator is found to scatter predominantly in the forward direction, whereas an anapole state emerges with significant reduction of scattering when the resonator is partially filled with water. Consequently, the proposed resonator may be of great interest within the broad area of antenna design and functional material platforms, encompassing not only the obvious microwave frequencies but also the THz- and optical domain using high-permittivity dielectrics and graphene/nano-particle surfaces.

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Liu, Chuanbao, Changxin Wang, Junhong Chen, Yanjing Su, Lijie Qiao, Ji Zhou et Yang Bai. « Ultrasensitive Frequency Shifting of Dielectric Mie Resonance near Metallic Substrate ». Research 2022 (9 mai 2022) : 1–9. http://dx.doi.org/10.34133/2022/9862974.

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Dielectric resonators on metallic surface can enhance far-field scattering and boost near-field response having promising applications in nonlinear optics and reflection-type devices. However, the dependence of gap size between dielectric resonator and metallic surface on Mie resonant frequency is complex and desires a comprehensive physical interpretation. Here, we systematically study the effect of metallic substrate on the magnetic dipole (MD) resonant frequency at X-band by placing a high permittivity CaTiO3 ceramic block on metallic substrate and regulating their gap size. The simulated and experimental results show that there are two physical mechanisms to codetermine the metallic substrate-induced MD frequency. The greatly enhanced electric field pair in the gap and the coupling of MD resonance with its mirror image are decisive for small and large gaps, respectively, making the MD resonant frequency present an exponential blue shift first and then a slight red shift with increasing gap size. Further, we use the two mechanisms to explain different frequency shifting properties of ceramic sphere near metallic substrate. Finally, taking advantage of the sharp frequency shifting to small gaps, the ceramic block is demonstrated to accurately estimate the thickness or permittivity of thin film on metallic substrate through a governing equation derived from the method of symbolic regression. We believe that our study will help to understand the resonant frequency shifting for dielectric particle near metallic substrate and give some prototypes of ultrasensitive detectors.

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Raya, Andrés M., David Fuster et José M. Llorens. « Numerical Study on Mie Resonances in Single GaAs Nanomembranes ». Nanomaterials 9, n^o 6 (5 juin 2019) : 856. http://dx.doi.org/10.3390/nano9060856.

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GaAs nanomembranes grown by selective area epitaxy are novel structures. The high refractive index of GaAs makes them good candidates for nanoantennas. We numerically studied the optical modal structure of the resonator. The nanomembrane geometry introduces a strong light-polarization dependence. The scattering is dominated by an electric dipole contribution for polarization along the nanomembrane long dimension and by a magnetic dipole contribution in the orthogonal direction. The dependence on the geometry of the resonances close to the GaAs band gap was modeled by a single coefficient. It describes the resonance shifts against up-to 40% changes in length, height, and width. We showed that the nanomembranes exhibited field enhancement, far-field directionality, and tunability with the GaAs band gap. All these elements confirm their great potential as nanoantennas.

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Wang, Xiaobo, et Ji Zhou. « Fano resonance in a subwavelength Mie-based metamolecule with split ring resonator ». Applied Physics Letters 110, n^o 25 (19 juin 2017) : 254101. http://dx.doi.org/10.1063/1.4989527.

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Sugimoto, Hiroshi, Takuma Okazaki et Minoru Fujii. « Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles ». Advanced Optical Materials 8, n^o 12 (20 avril 2020) : 2000033. http://dx.doi.org/10.1002/adom.202000033.

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Long, Houyou, Shuxiang Gao, Ying Cheng et Xiaojun Liu. « Multiband quasi-perfect low-frequency sound absorber based on double-channel Mie resonator ». Applied Physics Letters 112, n^o 3 (15 janvier 2018) : 033507. http://dx.doi.org/10.1063/1.5013225.

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Zeng, Jinwei, Mahsa Darvishzadeh-Varcheie, Mohammad Albooyeh, Mohsen Rajaei, Mohammad Kamandi, Mehdi Veysi, Eric O. Potma, Filippo Capolino et H. K. Wickramasinghe. « Exclusive Magnetic Excitation Enabled by Structured Light Illumination in a Nanoscale Mie Resonator ». ACS Nano 12, n^o 12 (5 décembre 2018) : 12159–68. http://dx.doi.org/10.1021/acsnano.8b05778.

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Zhang, Ting, Eun Bok, Motonobu Tomoda, Osamu Matsuda, Jianzhong Guo, Xiaojun Liu et Oliver B. Wright. « Compact acoustic metamaterial based on the 3D Mie resonance of a maze ball with an octahedral structure ». Applied Physics Letters 120, n^o 16 (18 avril 2022) : 161701. http://dx.doi.org/10.1063/5.0084030.

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Acoustic metamaterials (AMs) offer ever-expanding possibilities for manipulating sound waves. Potential applications include diagnostic medical imaging, super-absorption, acoustic sensing, and acoustic stealth. In spite of recent progress, the investigation of AMs with a three-dimensional (3D) response is lagging behind, in particular for those that exhibit an isotropic response. Here, we demonstrate a highly compact subwavelength maze-like multi-shell plastic sphere, which generates Mie resonances with isotropic monopolar and anisotropic dipole, quadrupole, and octupole modes at low frequencies for airborne sound, based on an octahedral structure. Eigenmode analysis shows that the proposed maze ball exhibits a negative bulk modulus at the monopole Mie resonance frequency in the absence of viscous losses, which is a signature of strong transmission blocking. With a diameter of 0.17 λ and a volume filling factor of 13.5%, a constructed single 3D maze ball reduces the experimentally-measured transmitted acoustic energy by 67%, limited mainly by viscous losses. With optimized fabrication, the proposed 3D Mie resonator should provide a versatile approach for the manipulation of sound waves on a subwavelength scale, and lead to the realization of practical 3D metamaterial devices.

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Lee, Kyung Hoon, Kunhao Yu, Hasan Al Ba’ba’a, An Xin, Zhangzhengrong Feng et Qiming Wang. « Sharkskin-Inspired Magnetoactive Reconfigurable Acoustic Metamaterials ». Research 2020 (5 février 2020) : 1–13. http://dx.doi.org/10.34133/2020/4825185.

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Most of the existing acoustic metamaterials rely on architected structures with fixed configurations, and thus, their properties cannot be modulated once the structures are fabricated. Emerging active acoustic metamaterials highlight a promising opportunity to on-demand switch property states; however, they typically require tethered loads, such as mechanical compression or pneumatic actuation. Using untethered physical stimuli to actively switch property states of acoustic metamaterials remains largely unexplored. Here, inspired by the sharkskin denticles, we present a class of active acoustic metamaterials whose configurations can be on-demand switched via untethered magnetic fields, thus enabling active switching of acoustic transmission, wave guiding, logic operation, and reciprocity. The key mechanism relies on magnetically deformable Mie resonator pillar (MRP) arrays that can be tuned between vertical and bent states corresponding to the acoustic forbidding and conducting, respectively. The MRPs are made of a magnetoactive elastomer and feature wavy air channels to enable an artificial Mie resonance within a designed frequency regime. The Mie resonance induces an acoustic bandgap, which is closed when pillars are selectively bent by a sufficiently large magnetic field. These magnetoactive MRPs are further harnessed to design stimuli-controlled reconfigurable acoustic switches, logic gates, and diodes. Capable of creating the first generation of untethered-stimuli-induced active acoustic metadevices, the present paradigm may find broad engineering applications, ranging from noise control and audio modulation to sonic camouflage.

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Fujii, Minoru, et Hiroshi Sugimoto. « (Invited, Digital Presentation) Enhancement of Magnetic Dipole Transition of Molecules By Silicon Nanoparticle Nanoantenna ». ECS Meeting Abstracts MA2022-01, n^o 20 (7 juillet 2022) : 1081. http://dx.doi.org/10.1149/ma2022-01201081mtgabs.

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A nanoantenna is a nanodevice that manipulates light propagation and enhances light-matter interaction at the nanoscale. Integration of an emitter into a nanoantenna capable of increasing local density of photonic states at the emission wavelength results in the enhanced spontaneous emission rate (Purcell effect). The most widely studied nanoantennas for the Purcell enhancement are plasmonic nanoantennas made from gold or silver nanostructures supporting surface plasmon resonances. In most cases, nanoantennas have been used for the enhancement of electric dipole-allowed transition of a molecule. In addition, recently, nanoantennas capable of enhancing magnetic dipole transition of a molecule are attracting attention. For the magnetic Purcell enhancement, nanoantennas have to have magnetic resonances at the optical frequency. Although it is possible to achieve magnetic resonances at the optical frequency by plasmonic nanostructures, the inherent absorption loss of noble metals limits the magnetic Purcell enhancement. On the other hand, nanoparticles of high refractive index dielectrics inherently have low-loss magnetic-type Mie resonances at the optical frequency, and thus are potentially more attractive as a material to realize large magnetic Purcell enhancement. We have developed spherical nanoparticles of crystalline silicon (Si) having the magnetic dipole (MD) and quadrupole (MQ) Mie resonances at the optical frequency [1]. In this work, to demonstrate the potential of a Si nanoparticle as a nanoantenna for the magnetic Purcell enhancement, we develop a composite nanoparticle, that is, a Si nanosphere decorated with europium ion (Eu3+) complexes, in which magnetic dipole emission of Eu3+ is efficiently coupled to the magnetic Mie modes of the nanosphere [2]. We systematically investigate the light scattering and photoluminescence spectra of the coupled system by means of single particle spectroscopy. The results are shown in Figure 1. By tuning the MQ Mie resonance of a Si nanosphere to the 5D0-7F1 magnetic dipole transition of Eu3+, the branching ratio between the magnetic and electric dipole (5D0-7F2) transitions is enhanced up to 7 times. The observed large magnetic Purcell enhancement offers an opportunity to develop novel fluorophores with enhanced magnetic dipole emission. Furthermore, the enhanced magnetic field of dielectric Mie resonators enhances otherwise very weak absorption due to magnetic dipole transition, and makes direct excitation of triplet states of a molecule possible [3]. Direct excitation of triplet states reduces photon energy necessary for energy conversion and chemical reactions utilizing a triplet state compared to a conventional process involving singlet-singlet excitation and singlet-triplet intersystem crossing. [1] H. Sugimoto, et. al., "Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles" Advanced Optical Materials, 8 (2020) 2000033. [2] H. Sugimoto, and Minoru Fujii, "Magnetic Purcell Enhancement by Magnetic Quadrupole Resonance of Dielectric Nanosphere Antenna", ACS Photonics, 8 (2021) 1794. [3] H. Sugimoto, et. al., "Direct Excitation of Triplet State of Molecule by Enhanced Magnetic Field of Dielectric Metasurfaces", Small, 2021, DOI: 10.1002/smll.202104458. Figure 1: Photoluminescence (red curves) and scattering (black curves) spectra of single Si naosphere-Eu3+ complex composite nanoparticles with different Si nanosphere diameters. The diameters are shown at the right end of the figure. Figure 1

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Fenollosa, Roberto, et Moises Garín. « Multilayer porous silicon spherical Mie resonator photodiodes with comb-like spectral response in the near infrared region ». Materials Science in Semiconductor Processing 150 (novembre 2022) : 106972. http://dx.doi.org/10.1016/j.mssp.2022.106972.

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Aalizadeh, Majid, Andriy E. Serebryannikov, Ekmel Ozbay et Guy A. E. Vandenbosch. « A simple Mie-resonator based meta-array with diverse deflection scenarios enabling multifunctional operation at near-infrared ». Nanophotonics 9, n^o 15 (29 septembre 2020) : 4589–600. http://dx.doi.org/10.1515/nanoph-2020-0386.

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AbstractDeflection, a basic functionality of wavefront manipulation is usually associated with the phase-gradient metasurfaces and the classical blazed gratings. We numerically and experimentally demonstrate an unusually wideband and simultaneously wide-angle deflection achieved at near-infrared in reflection mode for a periodic (nongradient), ultrathin meta-array comprising only one silicon nanorod (Mie resonator) per period. It occurs in the range where only the first negative diffraction order and zero order may propagate. Deflection serves as the enabler for multifunctional operation. Being designed with the main goal to obtain ultra-wideband and wide-angle deflection, the proposed meta-array is also capable in spatial filtering and wide-angle splitting. Spatial filtering of various types can be obtained in one structure by exploiting either deflection in nonzero diffraction orders, or the specular-reflection (zero-order) regime. Thus, the role of different diffraction orders is clarified. Moreover, on–off switching of deflection and related functionalities is possible by changing polarization state of the incident wave. The suggested device is simple to fabricate and only requires cost-effective materials, so it is particularly appropriate for the large-area fabrication using nanoprint lithography. Ultra-wideband wide-angle and other deflection scenarios, along with the other functionalities, are promising for applications in optical communications, laser optics, sensing, detection, and imaging.

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Ma, Ho Jin, Joonkyo Jung, Jung Hoon Kong, Jin Woo Park, Seung Jun Lee, Jonghwa Shin et Do Kyung Kim. « Mie resonator method for reliable permittivity measurement of loss-less ceramics in microwave frequency at high temperature ». Journal of Applied Physics 126, n^o 9 (7 septembre 2019) : 094101. http://dx.doi.org/10.1063/1.5093394.

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Krasnok, Alex. « Coherently Driven and Superdirective Antennas ». Electronics 8, n^o 8 (29 juillet 2019) : 845. http://dx.doi.org/10.3390/electronics8080845.

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Antennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power transfer (WPT) and superdirective dielectric antennas. We show that the concept of coherently enhanced WPT allows improvement of the antenna receiving efficiency by coherent excitation of the outcoupling waveguide with a backward propagating guided mode with a specific amplitude and phase. Antennas with the superdirectivity effect can increase the WPT system’s performance in another way, through tailoring of radiation diagram via engineering antenna multipoles excitation and interference of their radiation. We demonstrate a way to achieve the superdirectivity effect via higher-order multipoles excitation in a subwavelength high-index spherical dielectric resonator supporting electric and magnetic Mie multipoles. Thus, both types of antenna discussed here possess a coherent nature and can be used in modern intelligent antenna systems.

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Lei, Yunzhong, Jiu Hui Wu, Zhen Huang et Shaokun Yang. « Enhanced broadband monopole emission and acoustic energy harvesting via a dual anisotropic metamaterial ». Journal of Physics D : Applied Physics 55, n^o 6 (29 octobre 2021) : 065301. http://dx.doi.org/10.1088/1361-6463/ac30fd.

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Abstract Broadband sound energy enhancement is essential in practical scenarios, such as acoustic positioning and acoustic communication. In this paper, a dual anisotropic metamaterial composed of an inner Mie resonator and an outer acoustic grating is proposed, aiming to achieve enhanced broadband monopole emission and acoustic energy harvesting (AEH) via the coupling of the first and second monopole resonances. Considering thermo-viscous dissipation, numerical simulations and experimental results demonstrate that the dual anisotropic metamaterial can realize omnidirectional enhanced broadband monopole emission at 795 Hz–1511 Hz, the maximum sound pressure level (SPL) gain is 16.4 dB and the SPL gain fluctuation is 3 dB. Furthermore, simulation results reveal that the broadband AEH can be achieved by the dual anisotropic metamaterial, the fluctuation of the SPL gain at 794 Hz–1537 Hz is 3 dB and the maximum is 14.7 dB. Based on the results, the dual anisotropic metamaterial is expected to show significant potentials in acoustic positioning and acoustic communication.

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Wang, Jun, Shaobo Qu, Liyang Li, Jiafu Wang, Mingde Feng, Hua Ma, Hongliang Du et Zhuo Xu. « All-dielectric metamaterial frequency selective surface ». Journal of Advanced Dielectrics 07, n^o 05 (octobre 2017) : 1730002. http://dx.doi.org/10.1142/s2010135x1730002x.

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Frequency selective surface (FSS) has been extensively studied due to its potential applications in radomes, antenna reflectors, high-impedance surfaces and absorbers. Recently, a new principle of designing FSS has been proposed and mainly studied in two levels. In the level of materials, dielectric materials instead of metallic patterns are capable of achieving more functional performance in FSS design. Moreover, FSSs made of dielectric materials can be used in different extreme environments, depending on their electrical, thermal or mechanical properties. In the level of design principle, the theory of metamaterial can be used to design FSS in a convenient and concise way. In this review paper, we provide a brief summary about the recent progress in all-dielectric metamaterial frequency selective surface (ADM-FSS). The basic principle of designing ADM-FSS is summarized. As significant tools, Mie theory and dielectric resonator (DR) theory are given which illustrate clearly how they are used in the FSS design. Then, several design cases including dielectric particle-based ADM-FSS and dielectric network-based ADM-FSS are introduced and reviewed. After a discussion of these two types of ADM-FSSs, we reviewed the existing fabrication techniques that are used in building the experiment samples. Finally, issues and challenges regarding the rapid fabrication techniques and further development aspects are discussed.

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Liao, X., W. Zhou, Z. Y. Guo et Bei Peng. « The Size Effect on the Voltage-Dependent Frequency of Fixed-Fixed Carbon Nanotubes Resonator ». Applied Mechanics and Materials 66-68 (juillet 2011) : 1245–50. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1245.

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This work studies the size effect on voltage-dependent resonant frequency of fixed-fixed carbon nanotubes (CNTs) resonator. Specifically, the effect of resonator length, diameter, and gap distance on the variation of the natural frequency under the DC bias voltage is investigated. The resonator is modeled as a cylindrical beam whose ends are ideally fixed on the substrate. Under the condition of neglecting the impact of van der force (gap larger than 100nm), both elastic forces and the electrostatic forces are considered in this study. The variation of frequency with the DC bias voltage is usually decreasing, because the mechanical stiffness is larger than the electrostatic stiffness. But in some case, the effect of the mid-plane stretching dominates that of the electrostatic forcing, and the variation is increasing. Our results shows that the trend of variation is much depend on the size effect of device, especially the size of CNTs diameter. This fact is useful for designers to optimal design of CNTs resonators, either for tunable or stable resonators within a certain range of DC bias voltage.

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Zhang, Jialuo, Jun Chen, Meng Wang, Mingxu Su, Wu Zhou, Ravi Varma et Shengrong Lou. « Intercomparison of photoacoustic and cavity attenuated phase shift instruments : laboratory calibration and field measurements ». Geoscientific Instrumentation, Methods and Data Systems 10, n^o 2 (28 octobre 2021) : 245–55. http://dx.doi.org/10.5194/gi-10-245-2021.

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Abstract. The study of aerosol optical properties is essential to understand its impact on the global climate. In our recent field measurement carried out in the Gehu area of southwest Changzhou City, a photoacoustic extinctiometer (PAX) and a cavity attenuated phase shift albedo monitor (CAPS-ALB) were used for online aerosol optical properties measurement. Laboratory calibration with gas and particle samples were carried out to correct disagreements of field measurements. During particle calibration, we adopted ammonium sulfate (AS) samples for scattering calibration of nephelometer parts of both the instruments, then combined these with number-size distribution measurements in the MIE model for calculating the value of the total scattering (extinction) coefficient. During gas calibration, we employed high concentrations of NO2 for absorption calibration of the PAX resonator and then further intercompared the extinction coefficient of CAPS-ALB with a cavity-enhanced spectrometer. The correction coefficient obtained from the laboratory calibration experiments was employed on the optical properties observed in the field measurements correspondingly and showed good results in comparison with reconstructed extinction from the IMPROVE model. The intercomparison of the calibrated optical properties of PAX and CAPS-ALB in field measurements was in good agreement with slopes of 1.052, 1.024 and 1.046 for extinction, scattering and absorption respectively, which shows the reliability of measurement results and verifies the correlation between the photoacoustic and the cavity attenuated phase shift instruments.

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Ma, Wei, Yong Zheng Wen, Rui Zhao et Xiao Mei Yu. « Constructing Dual Band Metamaterial Absorbers at Mid-Infrared by Employing Multi-Resonant Structures ». Key Engineering Materials 645-646 (mai 2015) : 1059–63. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.1059.

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In this paper, we present two metamaterial absorbers (MMA) at mid-infrared using multi-resonant structures. The dual band MMAs employ the typical metal/dielectric/metal structure with 80 nm gold ground plane at the bottom, 190 nm SiO2 dielectric spacer in the middle and periodic gold patterns on top. The top resonant structure in MMA1 consists of a gold cross resonator ringed by four gold split-ring resonators (SRR) at the ends of the cross, while in the unit cell of MMA2, gold SRRs are placed at the four quadrants of the cross resonator. MMA1 shows two absorption peaks of 90.3% and 88.4% at 4.17μm and 4.86μm respectively, and the absorption peaks of MMA2 are observed to be 72.4% at 3.90μm and 48.0% at 5.66μm.

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Knöfel, Björn, Paula van Brummelen, Tobias Behrens et Hartmut Schirmer. « Does the wall sound different ? Variable acoustics in rehearsal rooms using small resonator structures in an acoustic panel. » INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, n^o 5 (1 août 2021) : 1867–78. http://dx.doi.org/10.3397/in-2021-1972.

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As the name already states, multipurpose rooms are often used from various people for different intentions like meetings or musical practicing. One example are musical rehearsal rooms, where the acoustic specifications have to meet the requirements of musicians playing different instrument groups. To meet the desire for variable acoustics in a rehearsal room, musicians often like to adjust the room to there personal preferences, what is mostly done by adjusting the frequency dependent room decay curve (T60). Hence, a variable acoustic panel has been developed which consists of several small adjustable resonator structures. In a closed state, the structure acts like a resonator. Although Helmholtz resonators are mostly used at low frequencies, the acoustic panel can address acoustic resonance absorption in the mid-frequency range between 500 Hz and 1.500 Hz. The paper highlights especially the dimensioning of the resonators and its measurements in an impedance tube, a reverberation cabin and a reverberation room. Finally, the prototype of the acoustic panel has been analysed in different rehearsal rooms where musicians examine the panel and T60 differences between the open and closed state of the panel were measured.

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Hou, Zhanyong, Chengguo Liu, Bin Zhang, Rongguo Song, Zhipeng Wu, Jingwei Zhang et Daping He. « Dual-/Tri-Wideband Bandpass Filter with High Selectivity and Adjustable Passband for 5G Mid-Band Mobile Communications ». Electronics 9, n^o 2 (22 janvier 2020) : 205. http://dx.doi.org/10.3390/electronics9020205.

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The design and implementation of the filters for the fifth-generation (5G) mobile communication systems are challengeable due to the demands of high integration, low-cost, and high-speed data transmission. In this paper, a dual-wideband bandpass filter (BPF) and a tri-wideband BPF for 5G mobile communications are proposed. The dual-wideband BPF consists of two folded open-loop stepped-impedance resonators (FOLSIRs), and the tri-wideband BPF is designed by placing a pair of folded uniform impedance resonator inside the dual-wideband BPF with little increase in the physical size of the filter. By employing a novel structural deformation of a stepped-impedance resonator, the FOLSIR is achieved with a more compact structure, a controllable transmission zero, and an adjustable resonant frequency. The measurement results show that the working bands of the two filters are 1.98–2.28/3.27–3.66 GHz and 2.035–2.305/3.31–3.71/4.54–5.18 GHz, respectively, which are consistent with the full-wave EM simulation results. The implemented filters have a compact size and the results show low loss, good out-of-band rejection, and wide passbands covering sub-6 GHz bands of 5G mobile communications and a commonly used spectrum.

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Li, Jingru, Peng Yang et Sheng Li. « Reduction of Sound Transmission Through Finite Clamped Metamaterial-Based Double-Wall Sandwich Plates with Poroelastic Cores ». Acta Acustica united with Acustica 105, n^o 5 (1 juillet 2019) : 850–68. http://dx.doi.org/10.3813/aaa.919365.

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Finite structures play a more realistic role in applications designed for sound and vibration isolation. Doublepanel structure with poroelastic cores is able to exhibit a superior sound insulation performance in mid-high frequency range, while is relatively inferior to isolate waves at low frequencies. In order to further reduce sound transmission at low frequencies and cater for the actual situation, this paper decides to introduce the metamaterial concept into finite double-wall sandwich plates and presents an analytical model to calculate the sound transmission loss through the metamaterial-based double-panel with fully clamped boundary conditions. The metamaterial-based double-wall sandwich plates are constructed by replacing the bare panel with the metamaterial plate, consisting of a homogeneous plate and periodically attached local resonators. Biot's theory is used to examine the wave propagation in the poroelastic medium. The vibro-acoustic problem of the proposed sandwich plate is solved by employing the modal superposition theory and the Galerkin method. Numerical results show that the sound transmission is significantly reduced at low frequencies. Unique phenomena caused by attached local resonators are explained and the eff ects of resonator inerter, incident angles and damping on the sound insulation properties are also studied.

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Triana, Johan F., Mauricio Arias, Jun Nishida, Eric A. Muller, Roland Wilcken, Samuel C. Johnson, Aldo Delgado, Markus B. Raschke et Felipe Herrera. « Semi-empirical quantum optics for mid-infrared molecular nanophotonics ». Journal of Chemical Physics 156, n^o 12 (28 mars 2022) : 124110. http://dx.doi.org/10.1063/5.0075894.

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Nanoscale infrared (IR) resonators with sub-diffraction limited mode volumes and open geometries have emerged as new platforms for implementing cavity quantum electrodynamics at room temperature. The use of IR nanoantennas and tip nanoprobes to study strong light–matter coupling of molecular vibrations with the vacuum field can be exploited for IR quantum control with nanometer spatial and femtosecond temporal resolution. In order to advance the development of molecule-based quantum nanophotonics in the mid-IR, we propose a generally applicable semi-empirical methodology based on quantum optics to describe light–matter interaction in systems driven by mid-IR femtosecond laser pulses. The theory is shown to reproduce recent experiments on the acceleration of the vibrational relaxation rate in infrared nanostructures. It also provides physical insights on the implementation of coherent phase rotations of the near-field using broadband nanotips. We then apply the quantum framework to develop general tip-design rules for the experimental manipulation of vibrational strong coupling and Fano interference effects in open infrared resonators. We finally propose the possibility of transferring the natural anharmonicity of molecular vibrational levels to the resonator near-field in the weak coupling regime to implement intensity-dependent phase shifts of the coupled system response with strong pulses and develop a vibrational chirping model to understand the effect. The semi-empirical quantum theory is equivalent to first-principles techniques based on Maxwell’s equations, but its lower computational cost suggests its use as a rapid design tool for the development of strongly coupled infrared nanophotonic hardware for applications ranging from quantum control of materials to quantum information processing.

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Xu, Rongyang, et Junichi Takahara. « Highly sensitive and robust refractometric sensing by magnetic dipole of Si nanodisks ». Applied Physics Letters 120, n^o 20 (16 mai 2022) : 201104. http://dx.doi.org/10.1063/5.0091862.

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Silicon metasurfaces have been attracting interest in the sensing field because of their ability to support magnetic Mie resonance, low optical heating, and CMOS-compatible fabrication processes. Herein, we demonstrate that the sensitivity of the magnetic dipole (MD) mode for nanodisk Mie resonators (as high as 385 nm/RIU) is similar to the sensitivity of plasmonic metasurfaces and greater than that of the electric dipole (ED) mode of nanodisk Mie resonators. We also engineer the thickness of Mie resonators to achieve an MD-mode linewidth as small as 0.56 nm and a figure of merit greater than 160 RIU−1. The measured sensitivity of the MD mode is more accurate than that of the ED mode, which is more prone than the MD mode to measurement errors arising from the partial filling of the liquid. Our study paves the way for the development of MD-mode-based dielectric biosensors for use in personal healthcare and medical diagnosis.

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Syubaev, Sergey, Eugeny Mitsai, Sergey Starikov et Aleksandr Kuchmizhak. « Laser-printed hemispherical silicon Mie resonators ». Optics Letters 46, n^o 10 (10 mai 2021) : 2304. http://dx.doi.org/10.1364/ol.425809.

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Ding, Lu, Ye Feng Yu, Dmitry Morits, Mingbin Yu, Thomas Y. L. Ang, Hong-Son Chu, Soon Thor Lim, Ching Eng Png, Ramon Paniagua-Dominguez et Arseniy I. Kuznetsov. « Low loss waveguiding and slow light modes in coupled subwavelength silicon Mie resonators ». Nanoscale 12, n^o 42 (2020) : 21713–18. http://dx.doi.org/10.1039/d0nr05248e.

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Naffouti, Meher, Thomas David, Abdelmalek Benkouider, Luc Favre, Antoine Ronda, Isabelle Berbezier, Sebastien Bidault, Nicolas Bonod et Marco Abbarchi. « Fabrication of poly-crystalline Si-based Mie resonators via amorphous Si on SiO2dewetting ». Nanoscale 8, n^o 5 (2016) : 2844–49. http://dx.doi.org/10.1039/c5nr07597a.

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Alpatov, V. V., M. G. Deminov, D. S. Faermark, I. A. Grebnev et M. J. Kosch. « Dynamics of Alfvén waves in the night-side ionospheric Alfvén resonator at mid-latitudes ». Annales Geophysicae 23, n^o 2 (28 février 2005) : 499–507. http://dx.doi.org/10.5194/angeo-23-499-2005.

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Abstract. A numerical solution of the problem on dynamics of shear-mode Alfvén waves in the ionospheric Alfvén resonator (IAR) region at middle latitudes at nighttime is presented for a case when a source emits a single pulse of duration τ into the resonator region. It is obtained that a part of the pulse energy is trapped by the IAR. As a result, there occur Alfvén waves trapped by the resonator which are being damped. It is established that the amplitude of the trapped waves depends essentially on the emitted pulse duration τ and it is maximum at τ=(3/4)T, where T is the IAR fundamental period. The maximum amplitude of these waves does not exceed 30% of the initial pulse even under optimum conditions. Relatively low efficiency of trapping the shear-mode Alfvén waves is caused by a difference between the optimum duration of the pulse and the fundamental period of the resonator. The period of oscillations of the trapped waves is approximately equal to T, irrespective of the pulse duration τ. The characteristic time of damping of the trapped waves τdec is proportional to T, therefore the resonator Q-factor for such waves is independent of T. For a periodic source the amplitude-frequency characteristic of the IAR has a local minimum at the frequency π/ω=(3/4)T, and the waves of such frequency do not accumulate energy in the resonator region. At the fundamental frequency ω=2π/T the amplitude of the waves coming from the periodic source can be amplified in the resonator region by more than 50%. This alone is a basic difference between efficiencies of pulse and periodic sources of Alfvén waves. Explicit dependences of the IAR characteristics (T, τdec, Q-factor and eigenfrequencies) on the altitudinal distribution of Alfvén velocity are presented which are analytical approximations of numerical results.

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Garín, M., M. Solà, A. Julian et P. Ortega. « Enabling silicon-on-silicon photonics with pedestalled Mie resonators ». Nanoscale 10, n^o 30 (2018) : 14406–13. http://dx.doi.org/10.1039/c8nr02259c.

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Chen, Shengqiong, Longjie Li, Feng Jin, Cheng Lu, Shengjie Zhao, Jiebin Niu et Lina Shi. « Low threshold lasing from silicon Mie resonators ». Optics & ; Laser Technology 148 (avril 2022) : 107762. http://dx.doi.org/10.1016/j.optlastec.2021.107762.

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Xu, Zuying, Tailin Li, Chaotan Sima, Yanhong Long, Xiaohang Zhang, Yan Ai, Minzhi Hong et al. « Mid-Infrared Hollow-Core Fiber Based Flexible Longitudinal Photoacoustic Resonator for Photoacoustic Spectroscopy Gas Sensing ». Photonics 9, n^o 12 (23 novembre 2022) : 895. http://dx.doi.org/10.3390/photonics9120895.

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Photoacoustic spectroscopy (PAS) has received extensive attention in optical gas sensing due to the advantages of high sensitivity, gas selectivity, and online detection. Here, a mid-infrared hollow-core fiber (HCF) based flexible longitudinal photoacoustic resonator for PAS-based gas sensing is proposed and theoretically demonstrated. A mid-infrared anti-resonant HCF is designed to innovatively replace the traditional metallic acoustic resonator and obtain a flexible photoacoustic cell in PAS. Optical transmission characteristics of the HCF are analyzed and discussed, achieving single mode operation with below 1 dB/m confinement loss between 3 and 8 μm and covering strong absorptions of some hydrocarbons and carbon oxides. With varied bending radii from 10 mm to 200 mm, the optical mode could be maintained in the hollow core. Based on the photoacoustic effect, generated acoustic mode distributions in the HCF-based flexible photoacoustic resonator are analyzed and compared. Results show that the PAS-based sensor has a stable and converged acoustic profile at the resonant frequency of around 16,787 Hz and a favorable linear response to light source power and gas concentration. The proposed novel photoacoustic resonator using HCF presents bring potential for advanced flexible PAS-based gas detection.

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Zhou, H., T. W. Wu, P. Wang et J. P. Engel. « A simple four-pole solution with FEM/BEM validation to estimate the effectiveness of compact resonators in large silencers ». INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, n^o 1 (24 juin 2022) : 393–99. http://dx.doi.org/10.3397/nc-2022-747.

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Large absorptive silencers are used in the power generation industry to abate intake or exhaust noise. They are very effective at mid to high frequencies; however, low-frequency performance is an area of concern for absorptive silencers. Hybrid baffles and bars with empty space reserved for a quarter wavelength duct design have been used to target low-frequency tonal noise with some success. Although, at times the hybrid baffles or bars themselves are not enough to reduce the low-frequency noise to an acceptable level. Synonymously, the overall high-frequency performance may suffer due to the loss of space that could be used for more dissipative elements such as absorptive baffles or bars. Compact resonators with a tapering neck may then be considered as an add-on to improve the low-frequency performance. In this paper, a simple four-pole solution is utilized to estimate the first natural frequency of a compact resonator. The end correction factor is then empirically correlated to the finite element method (FEM) or boundary element method (BEM) solution. The small compact devices have a potential application to provide engineers with a very flexible design add-on strategy without significantly altering the installed silencer design, and their target frequencies can also be adjusted depending on the situation.

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Sun, Zhenci, Xiaoguang Zhao, Lingyun Zhang, Ziqi Mei, Han Zhong, Rui You, Wenshuai Lu, Zheng You et Jiahao Zhao. « WiFi Energy-Harvesting Antenna Inspired by the Resonant Magnetic Dipole Metamaterial ». Sensors 22, n^o 17 (30 août 2022) : 6523. http://dx.doi.org/10.3390/s22176523.

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WiFi energy harvesting is a promising solution for powering microsensors and microsystems through collecting electromagnetic (EM) energies that exist everywhere in modern daily lives. In order to harvest EM energy, we proposed a metamaterial-inspired antenna (MIA) based on the resonant magnetic dipole operating in the WiFi bands. The MIA consists of two metallic split-ring resonators (SRRs), separated by an FR4 dielectric layer, in the broadside coupled configuration. The incident EM waves excite surface currents in the coupled SRRs, and the energy is oscillating between them due to near-field coupling. By varying the vertical distance of the two SRRs, we may achieve impedance matching without complicated matching networks. Collected EM energy can be converted to DC voltages via a rectifier circuit at the output of the coupling coil. Measured results demonstrate that the designed MIA may resonate at 2.4 GHz with a deep-subwavelength form factor (14 mm×14 mm×1.6 mm). The WiFi energy-harvesting capability of the proposed MIA with an embedded one-stage Dickson voltage multiplier has also been evaluated. A rectified DC voltage is approximately 500 mV when the MIA is placed at a distance of 2 cm from the WiFi transmit antenna with a 9 dBm transmitting power. The proposed compact MIA in this paper is of great importance for powering future distributed microsystems.

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Jie Huang, Jie Huang, Junbo Yang Junbo Yang, Hailiang Zhang Hailiang Zhang, Hongqing Wang Hongqing Wang, Wenjun Wu Wenjun Wu, DingBo Chen DingBo Chen et and Shengli Chang and Shengli Chang. « Analysis of an integrated tunable spectrometer for the short to mid-infrared range based on a ring resonator ». Chinese Optics Letters 14, n^o 10 (2016) : 101301–4. http://dx.doi.org/10.3788/col201614.101301.

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Shamkhi, H. K., et A. Canós Valero. « Multifrequency superscattering driven by symmetry-reduced resonators ». Journal of Physics : Conference Series 2172, n^o 1 (1 février 2022) : 012002. http://dx.doi.org/10.1088/1742-6596/2172/1/012002.

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Abstract We unveil novel mechanisms to achieve superscattering by investigating the resonances’ profile of non-Hermitian Hamiltonian structures lacking spherical symmetry. We show that superscattering can be obtained within a single scattering channel due to a contribution of a single strongly-coupled mode. Such phenomenon can’t be observed in Mie-based resonators. We then spatially and spectrally engineer modes of multi-resonators in a cluster to realize broadband superscattering with ultra-strong resonances at several frequency points.

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Asgari, Somayyeh, et Tapio Fabritius. « Tunable Mid-Infrared Graphene Plasmonic Cross-Shaped Resonator for Demultiplexing Application ». Applied Sciences 10, n^o 3 (10 février 2020) : 1193. http://dx.doi.org/10.3390/app10031193.

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In this study, a tunable graphene plasmonic filter and a two-channel demultiplexer are proposed, simulated, and analyzed in the mid-infrared (MIR) region. We discuss the optical transmission spectra of the proposed cross-shaped resonator and the two-channel demultiplexer. The transmission spectra of the proposed MIR resonator are tunable by change of its dimensional parameters and the Fermi energy of the graphene. Our proposed structures have a single mode in the wavelength range of 5–12 µm. The minimum full width at half maximum (FWHM) and the maximum transmission ratio of the proposed resonator respectively reached 220 nm and 55%. Simulations are performed by use of three-dimensional finite-difference time-domain (3D-FDTD) method. Coupled mode theory (CMT) is used to investigate the structure theoretically. The numerical and the theoretical results are in good agreement. The performance of the proposed two-channel demultiplexer is investigated based on its crosstalk. The minimum value of crosstalk reaches −48.30 dB. Our proposed structures are capable of providing sub-wavelength confinement of light waves, useful in applications in MIR region.

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Kurganov, Georgiy, Dmitry Dobrykh, Ekaterina Puhtina, Ildar Yusupov, Alexey Slobozhanyuk, Yuri S. Kivshar et Dmitry Zhirihin. « Temperature control of electromagnetic topological edge states ». Applied Physics Letters 120, n^o 23 (6 juin 2022) : 233105. http://dx.doi.org/10.1063/5.0096841.

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Topological photonics provides exceptional opportunities to control electromagnetic waves with a great potential for applications. Most of the proposed photonic systems support topological edge states with fixed parameters, thus hindering their practical applications. The study of nonlinear and tunable effects in topological systems enlarges applications of topological phenomena. Here, we propose an approach for the manipulation of photonic topological edge states based on temperature tuning. We design and demonstrate experimentally topological zigzag arrays composed of high-index resonators. The resonators are fabricated from ferroelectrics that brings an opportunity to dynamically change their permittivity by heating. We study the emergence of topological edge states in zigzag arrays of ferroelectric particles supporting the Mie resonances and demonstrate the topological transition induced by heating individual resonators in the array.

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Proust, Julien, Frédéric Bedu, Bruno Gallas, Igor Ozerov et Nicolas Bonod. « All-Dielectric Colored Metasurfaces with Silicon Mie Resonators ». ACS Nano 10, n^o 8 (8 août 2016) : 7761–67. http://dx.doi.org/10.1021/acsnano.6b03207.

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Liang, Wei, Yong Xu, Yanyi Huang, Amnon Yariv, J. G. Fleming et Shawn-Yu Lin. « Mie scattering analysis of spherical Bragg "onion" resonators ». Optics Express 12, n^o 4 (2004) : 657. http://dx.doi.org/10.1364/opex.12.000657.

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Pittella, Erika, Leopoldo Angrisani, Andrea Cataldo, Emanuele Piuzzi et Francesco Fabbrocino. « Embedded Split Ring Resonator Network for Health Monitoring in Concrete Structures ». IEEE Instrumentation & ; Measurement Magazine 23, n^o 9 (décembre 2020) : 14–20. http://dx.doi.org/10.1109/mim.2020.9289070.

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Alnahwi, Falih M., Yasir I. A. Al-Yasir, Abdulghafor A. Abdulhameed, Abdulkareem S. Abdullah et Raed A. Abd-Alhameed. « A Low-Cost Microwave Filter with Improved Passband and Stopband Characteristics Using Stub Loaded Multiple Mode Resonator for 5G Mid-Band Applications ». Electronics 10, n^o 4 (11 février 2021) : 450. http://dx.doi.org/10.3390/electronics10040450.

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This paper presents the design and implementation of a printed circuit microwave band-pass filter for 5G mid-band applications, using a Stub Loaded Multiple Mode Resonator (SL-MMR) technique. The objective of this article is to introduce a low-cost microstrip filter with improved passband and stopband characteristics, based on a mathematical analysis of stub loaded resonators. The filter cost is reduced by selecting the low-cost FR4 dielectric material as a substrate for the proposed filter. Based on the transmission line model of the filter, mathematical expressions are derived to predict the odd-mode and the even-mode resonant frequencies of the SL-MMR. The mathematical model also highlights the capability of controlling the position of the SL-MMR resonant frequencies, so that the 5G sub-band that extends along the range (3.7–4.2 GHz) can perfectly be covered with almost a flat passband. At the resonance frequency, a fractional bandwidth of 12.8% (500 MHz impedance bandwidth) has been obtained with a return loss of more than 18 dB and an insertion loss of less than 2.5 dB over the targeted bandwidth. Furthermore, a pair of parasitic elements is attached to the proposed filter to create an additional transmission zero in the lower stopband of the filter to enhance the suppression of the filter stopband. The measured and simulation results are well agreed, and both reveal the acceptable performance of the stopband and passband characteristics of the filter.

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