Articles de revues : « Mie modes »

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Bulgakov, Evgeny, Konstantin Pichugin et Almas Sadreev. « Mie Resonance Engineering in Two Disks ». Photonics 8, n^o 2 (13 février 2021) : 49. http://dx.doi.org/10.3390/photonics8020049.

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Recently the recipes to achieve the high-Q subwavelength resonances in an isolated dielectric disk have been reported based on avoided crossing (anticrossing) of the TE resonances under variation of the aspect ratio of the disk. In a silicon disk that recipe gives an enhancement of the Q factor by one order of magnitude. In the present paper we present the approach based on engineering of the spherical Mie resonances with high orbital index in two coaxial disks by two-fold avoided crossing of the resonant modes of the disks. At the first step we select the resonant modes of single disk which are degenerate because of the opposite symmetry. Approaching of the second disk removes this degeneracy because of interaction between the disks. As a result at certain distances we realize the hybridized anti-bonding resonant modes whose morphology becomes close to the spherical Mie resonant mode with high orbital index. Respectively the Q factor of the anti-bonding resonant mode can be enhanced by three orders of magnitude compared to the case of single disk.

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Gao, Ju, Kuang Zhang, Guohui Yang, Sungtek Kahng et Qun Wu. « Tunable Control of Mie Resonances Based on Hybrid VO2 and Dielectric Metamaterial ». Symmetry 10, n^o 10 (20 septembre 2018) : 423. http://dx.doi.org/10.3390/sym10100423.

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In this paper, a tunable dielectric metamaterial absorber with temperature-based vanadium dioxide (VO2) is proposed. In contrast to previous studies, both the metal phase of VO2 and the semiconductor phase are applied to manipulate the Mie resonant modes in the dielectric cubes. By embedding VO2 in the main resonant structure, the control over Mie resonant modes in dielectric metamaterials is realized. Each resonant mode is analyzed through field distribution and explains why the phase switch of VO2 could affect the absorbance spectrum. This use of tunable materials could create another new methodology for the manipulation of the Mie resonance-based dielectric cubes and make them closer in essence to isotropic metamaterials.

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Toftul, Ivan, Kristina Frizyuk et Mihail Petrov. « Total angular momenta quantization of dielectric sphere modes ». Journal of Physics : Conference Series 2015, n^o 1 (1 novembre 2021) : 012152. http://dx.doi.org/10.1088/1742-6596/2015/1/012152.

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Abstract Spherical particles both dielectric and metallic are essential building blocks in nanophotonics. During the recent rapid development of Mie-tronic — nanophotonics devices heavily using various features of the Mie-resonances — the deep fundamental investigation of the eigenmodes of such particles by using the novel tools is still relevant and currently important. Moreover, eigenmodes of a sphere are closely related to the Vector Spherical Harmonics (VSH) which are widely used in the multipolar decomposition to analyze less symmetric structures. In this work, we study in detail the canonical spin and angular momenta (AM), helicity, and other properties of the eigenmodes of dielectric (nondispersive) and metallic (dispersive) spheres. We show that the canonical momentum density of the AM is quantized and has a close relation to the quantum picture of a single photon. Our work provides a solid platform for future studies and applications of the AM transfer from near fields of spherical particles to the matter in its vicinity.

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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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Berestennikov, A. S., Y. Li, I. V. Iorsh, A. A. Zakhidov, A. L. Rogach et S. V. Makarov. « Beyond quantum confinement : excitonic nonlocality in halide perovskite nanoparticles with Mie resonances ». Nanoscale 11, n^o 14 (2019) : 6747–54. http://dx.doi.org/10.1039/c8nr09837a.

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Mcphedran, R. C., et B. Stout. « ‘Killing Mie Softly’ : Analytic Integrals for Complex Resonant States ». Quarterly Journal of Mechanics and Applied Mathematics 73, n^o 2 (20 mars 2020) : 119–39. http://dx.doi.org/10.1093/qjmam/hbaa004.

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Summary We consider integrals of products of Bessel functions and of spherical Bessel functions, combined with a Gaussian factor guaranteeing convergence at infinity. These integrals arise in wave and quantum mechanical scattering problems of open systems containing cylindrical or spherical scatterers, particularly when those problems are considered in the framework of complex resonant modes. Explicit representations are obtained for the integrals, building on those in the 1992 paper by McPhedran, Dawes and Scott. Attention is paid to those sums with a distributive part arising as the Gaussian tends towards the unit function. In this limit, orthogonality and normalisability of complex modes are investigated.

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Huston, A. L., H. B. Lin, J. D. Eversole et A. J. Campillo. « Nonlinear Mie scattering : electrostrictive coupling of light to droplet acoustic modes ». Optics Letters 15, n^o 21 (1 novembre 1990) : 1176. http://dx.doi.org/10.1364/ol.15.001176.

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Akmansoy, Eric, et Simon Marcellin. « Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies ». EPJ Applied Metamaterials 5 (2018) : 10. http://dx.doi.org/10.1051/epjam/2018006.

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We elucidate the role of the mode coupling of the Mie resonances in all-dielectric metamaterials to ensure a negative effective index at terahertz frequencies. We perform a study as a function of the lattice period and of the frequency overlapping of the modes of resonance. We show that negative effective refractive index requires sufficiently strong mode coupling and that for even more strong mode coupling, the first two modes of Mie resonances are degenerate; the effective refractive index is then undetermined. We also show that it is possible to obtain near-zero, or even null, effective index with a judicious adjustment of the mode coupling. Further, we discuss the mode coupling effect with hybridization in metamaterials.

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Bulgakov, E., K. Pichugin et A. Sadreev. « Interaction between dielectric particles enhances the Q-factor ». Advanced Electromagnetics 8, n^o 4 (17 décembre 2019) : 108–17. http://dx.doi.org/10.7716/aem.v8i4.1292.

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We study behavior of resonant modes with a distance between two identical dielectric cylinders and disks. We reveal two basic scenarios of evolution of resonances with the distance between the cylinders. For larger distances and respectively weaker interaction of particles the resonances are bound around the Mie resonances and evolve by spiral way. For shorter distances and respectively stronger interaction the resonances bypass the Mie resonances. Both scenarios demonstrate considerable enhancement of the Q factor compared to the case of isolated particle.

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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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Kroychuk, Maria K., Alexander S. Shorokhov, Damir F. Yagudin, Maxim V. Rakhlin, Grigorii V. Klimko, Alexey A. Toropov, Tatiana V. Shubina et Andrey A. Fedyanin. « Quantum Dot Photoluminescence Enhancement in GaAs Nanopillar Oligomers Driven by Collective Magnetic Modes ». Nanomaterials 13, n^o 3 (27 janvier 2023) : 507. http://dx.doi.org/10.3390/nano13030507.

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Single photon sources based on semiconductor quantum dots are one of the most prospective elements for optical quantum computing and cryptography. Such systems are often based on Bragg resonators, which provide several ways to control the emission of quantum dots. However, the fabrication of periodic structures with many thin layers is difficult. On the other hand, the coupling of single-photon sources with resonant nanoclusters made of high-index dielectric materials is known as a promising way for emission control. Our experiments and calculations show that the excitation of magnetic Mie-type resonance by linearly polarized light in a GaAs nanopillar oligomer with embedded InAs quantum dots leads to quantum emitters absorption efficiency enhancement. Moreover, the nanoresonator at the wavelength of magnetic dipole resonance also acts as a nanoantenna for a generated signal, allowing control over its radiation spatial profile. We experimentally demonstrated an order of magnitude emission enhancement and numerically reached forty times gain in comparison with unstructured film. These findings highlight the potential of quantum dots coupling with Mie-resonant oligomers collective modes for nanoscale single-photon sources development.

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Veeken, Tom, Benjamin Daiber, Harshal Agrawal, Mark Aarts, Esther Alarcón-Lladó, Erik C. Garnett, Bruno Ehrler, Jorik van de Groep et Albert Polman. « Directional quantum dot emission by soft-stamping on silicon Mie resonators ». Nanoscale Advances 4, n^o 4 (2022) : 1088–97. http://dx.doi.org/10.1039/d1na00630d.

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We present a soft-stamping method to selectively print a homogenous layer of CdSeTe/ZnS core–shell quantum dots (QDs) on top of Si nanocylinders with Mie-type resonant modes. Depending on the cylinder shape, we direct the QD emission up or down.

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Izzati, Nurul. « Tindak Tutur Ilokusi pada Poster Iklan Mie Indomie Periode 2019-2020 (Studi Analisis Pragmatik) ». Diwan : Jurnal Bahasa dan Sastra Arab 13, n^o 2 (25 avril 2022) : 116–31. http://dx.doi.org/10.15548/diwan.v13i2.713.

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This paper discusses the illocutionary speech acts of the Mie Indomie advertisement poster for the 2019-2020 period which was published on the Indomie Egypt - facebook account. This study focuses on discussing the communicative forms and functions of illocutionary speech acts contained in the Mie Indomie advertising poster for the 2019-2020 period, as well as what speech modes are used when marketing the product. All of the focus of this research will be dissected by using the theory of illocutionary speech acts proposed by Searle. The results showed that during the 2019-2020 period, the Mie Indomie company launched 18 advertising posters. Where out of these 18 advertisement posters, 12 Mie Indomie advertisement posters use declarative speech mode, 4 advertisement posters use imperative speech mode, and 2 posters use interrogative speech mode. As for the speech function, there are 7 MieIndomie advertising posters that use assertive speech functions, 7 advertising posters that use directive speech functions, and 4 advertising posters that use commissive speech functions with each communicative function.

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Granchi, Nicoletta, Michele Montanari, Andrea Ristori, Mario Khoury, Mohammed Bouabdellaoui, Chiara Barri, Luca Fagiani et al. « Near-field hyper-spectral imaging of resonant Mie modes in a dielectric island ». APL Photonics 6, n^o 12 (1 décembre 2021) : 126102. http://dx.doi.org/10.1063/5.0070626.

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Weiss, D. S., V. Sandoghdar, J. Hare, V. Lefèvre-Seguin, J. M. Raimond et S. Haroche. « Splitting of high-Q Mie modes induced by light backscattering in silica microspheres ». Optics Letters 20, n^o 18 (15 septembre 1995) : 1835. http://dx.doi.org/10.1364/ol.20.001835.

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Lukens, Katherine E., Kayo Ide, Kevin Garrett, Hui Liu, David Santek, Brett Hoover et Ross N. Hoffman. « Exploiting Aeolus level-2b winds to better characterize atmospheric motion vector bias and uncertainty ». Atmospheric Measurement Techniques 15, n^o 9 (6 mai 2022) : 2719–43. http://dx.doi.org/10.5194/amt-15-2719-2022.

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Abstract. The need for highly accurate atmospheric wind observations is a high priority in the science community, particularly for numerical weather prediction (NWP). To address this need, this study leverages Aeolus wind lidar level-2B data provided by the European Space Agency (ESA) as a potential comparison standard to better characterize atmospheric motion vector (AMV) bias and uncertainty. AMV products from geostationary (GEO) and low Earth orbiting (LEO) satellites are compared with reprocessed Aeolus horizontal line-of-sight (HLOS) global winds observed in August–September 2019. Winds from two Aeolus observing modes are compared with AMVs, namely Rayleigh-clear (RAY; derived from the molecular scattering signal) and Mie-cloudy (MIE; derived from the particle scattering signal). Quality-controlled (QC'd) Aeolus winds are co-located with QC'd AMVs in space and time, and the AMVs are projected onto the Aeolus HLOS direction. Mean co-location differences (MCDs) and the standard deviation (SD) of those differences (SDCDs) are determined and analyzed. As shown in other comparison studies, the level of agreement between AMV and Aeolus wind velocities (HLOSVs) varies with the AMV type, geographic region, and height of the co-located winds, as well as with the Aeolus observing mode. In terms of global statistics, QC'd AMVs and QC'd Aeolus HLOSVs are highly correlated for both observing modes. Aeolus MIE winds are shown to have great potential value as a comparison standard to characterize AMVs, as MIE co-locations generally exhibit smaller biases and uncertainties compared to RAY co-locations. Aeolus RAY winds contribute a substantial fraction of the total SDCDs in the presence of clouds where co-location/representativeness errors are also large. Stratified comparisons with Aeolus HLOSVs are consistent with known AMV bias and uncertainty in the tropics, NH extratropics, the Arctic, and at mid- to upper-levels in clear and cloudy scenes. AMVs in the SH/Antarctic generally exhibit larger-than-expected MCDs and SDCDs, most probably due to larger AMV height assignment errors and co-location/representativeness errors in the presence of high wind speeds and strong vertical wind shear, particularly for RAY comparisons.

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TEIXEIRA RABELO, J. N., E. S. CARDOSO et V. I. ZUBOV. « EFFECT OF TEMPERATURE ON INTRINSIC LOCALIZED MODES IN ANHARMONIC LATTICES ». Modern Physics Letters B 14, n^o 27n28 (10 décembre 2000) : 1001–7. http://dx.doi.org/10.1142/s0217984900001233.

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We study the effect of temperature on Intrinsic Localized Modes (ILM) in anharmonic lattices. An approach is proposed based on the Method of the Unsymmetrized Self-Consistent Field (USF). The special case of an odd-parity mode in an anharmonic linear chain with Mie–Lennard–Jones potential is investigated in more detail. We find that in the weak anharmonic approximation, an increasing of temperature does not change the pattern of the mode, leading to a very small decreasing of the displacement amplitudes and a decreasing of the mode frequency. The frequency of the mode increases with increasing of both the repulsion and attraction indexes. This effect is more sensitive to the repulsion index.

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de Ceglia, Domenico, Luca Carletti, Maria Antonietta Vincenti, Costantino De Angelis et Michael Scalora. « Second-Harmonic Generation in Mie-Resonant GaAs Nanowires ». Applied Sciences 9, n^o 16 (16 août 2019) : 3381. http://dx.doi.org/10.3390/app9163381.

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We investigate the enhancement of second-harmonic generation in cylindrical GaAs nanowires. Although these nanostructures confine light in two dimensions, power conversion efficiencies on the order of 10 − 5 with a pump peak intensity of ~ 1 GW / cm 2 are possible if the pump and the second-harmonic fields are coupled to the Mie-type resonances of the nanowire. We identify a large range of nanowire radii in which a double-resonance condition, i.e., both the pump and the second-harmonic fields excite normal modes of the nanowire, induces a high-quality-factor peak of conversion efficiency. We show that second-harmonic light can be scattered with large efficiency even if the second-harmonic photon energy is larger than 1.42 eV, i.e., the electronic bandgap of GaAs, above which the material is considered opaque. Finally, we evaluate the efficiency of one-photon absorption of second-harmonic light and find that resonant GaAs nanowires absorb second-harmonic light in the near-field region almost at the same rate at which they radiate second-harmonic light in the far-field region.

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Diaz-Valencia, B. F., J. R. Mejía-Salazar et N. Porras-Montenegro. « Absorption effects on the Mie plasmon-polariton modes in two-dimensional plasmonic photonic crystals ». Superlattices and Microstructures 85 (septembre 2015) : 608–14. http://dx.doi.org/10.1016/j.spmi.2015.05.046.

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Wang, Xiaowei, Leonard C. Kogos et Roberto Paiella. « Giant distributed optical-field enhancements from Mie-resonant lattice surface modes in dielectric metasurfaces ». OSA Continuum 2, n^o 1 (17 décembre 2018) : 32. http://dx.doi.org/10.1364/osac.2.000032.

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Ignatyeva, Daria O., et Vladimir I. Belotelov. « Magneto-Optical Spectroscopy of Short Spin Waves by All-Dielectric Metasurface ». Nanomaterials 12, n^o 23 (25 novembre 2022) : 4180. http://dx.doi.org/10.3390/nano12234180.

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The optical method of spin dynamics measurements via the detection of various magneto-optical effects is widely used nowadays. Besides it being a convenient method to achieve time-resolved measurements, its spatial resolution in the lateral direction is limited by a diffraction limit for the probe light. We propose a novel approach utilizing a Mie-resonance-based all-dielectric metasurface that allows for the extraction of a signal of a single submicron-wavelength spin wave from the wide spin precession spectra. This approach is based on the possibility of designing a metasurface that possesses nonuniform magneto-optical sensitivity to the different nanoscale regions of the smooth magnetic film due to the excitation of the Mie modes. The metasurface is tuned to be unsensitive to the long-wavelength spin precession, which is achieved by the optical resonance-caused zeroing of the magneto-optical effect for uniform magnetization in the vicinity of the resonance. At the same time, such a Mie-supporting metasurface exhibits selective sensitivity to a narrow range of short wavelengths equal to its period.

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Colas des Francs, G., S. Derom, R. Vincent, A. Bouhelier et A. Dereux. « Mie Plasmons : Modes Volumes, Quality Factors, and Coupling Strengths (Purcell Factor) to a Dipolar Emitter ». International Journal of Optics 2012 (2012) : 1–8. http://dx.doi.org/10.1155/2012/175162.

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Using either quasistatic approximation or exact Mie expansion, we characterize the localized surface plasmons supported by a metallic spherical nanoparticle. We estimate the quality factorQnand define the effective volumeVnof thenth mode in such a way that coupling strength with a neighbouring dipolar emitter is proportional to the ratioQn/Vn(Purcell factor). The role of Joule losses, far-field scattering, and mode confinement in the coupling mechanism is introduced and discussed with simple physical understanding, with particular attention paid to energy conservation.

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Zhu, Huihui, Xufeng Jing et Pengwei Zhou. « Strong dipole and higher multi-pole Mie resonance modes with all-dielectric nanoring metasurfaces structure ». Superlattices and Microstructures 113 (janvier 2018) : 592–99. http://dx.doi.org/10.1016/j.spmi.2017.11.045.

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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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Adl, Hamid Pashaei, Setatira Gorji, Andrés F. Gualdrón-Reyes, Iván Mora-Seró, Isaac Suárez et Juan P. Martínez-Pastor. « Enhanced Spontaneous Emission of CsPbI3 Perovskite Nanocrystals Using a Hyperbolic Metamaterial Modified by Dielectric Nanoantenna ». Nanomaterials 13, n^o 1 (20 décembre 2022) : 11. http://dx.doi.org/10.3390/nano13010011.

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In this work, we demonstrate, theoretically and experimentally, a hybrid dielectric-plasmonic multifunctional structure able to provide full control of the emission properties of CsPbI3 perovskite nanocrystals (PNCs). The device consists of a hyperbolic metamaterial (HMM) composed of alternating thin metal (Ag) and dielectric (LiF) layers, covered by TiO2 spherical MIE nanoresonators (i.e., the nanoantenna). An optimum HMM leads to a certain Purcell effect, i.e., an increase in the exciton radiative rate, but the emission intensity is reduced due to the presence of metal in the HMM. The incorporation of TiO2 nanoresonators deposited on the top of the HMM is able to counteract such an undesirable intensity reduction by the coupling between the exciton and the MIE modes of the dielectric nanoantenna. More importantly, MIE nanoresonators result in a preferential light emission towards the normal direction to the HMM plane, increasing the collected signal by more than one order of magnitude together with a further increase in the Purcell factor. These results will be useful in quantum information applications involving single emitters based on PNCs together with a high exciton emission rate and intensity.

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Shen, Fei, Ning An, Yifei Tao, Hongping Zhou, Zhaoneng Jiang et Zhongyi Guo. « Anomalous forward scattering of gain-assisted dielectric shell-coated metallic core spherical particles ». Nanophotonics 6, n^o 5 (9 décembre 2016) : 1063–72. http://dx.doi.org/10.1515/nanoph-2016-0141.

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AbstractWe have investigated the scattering properties of an individual core-shell nanoparticle using the Mie theory, which can be tuned to support both electric and magnetic modes simultaneously. In general, the suppression of forward scattering can be realized by the second Kerker condition. Here, a novel mechanism has to be adopted to explain zero-forward scattering, which originates from the complex interactions between dipolar and quadrupolar modes. However, for lossy and lossless core-shell spherical nanoparticles, zero-forward scattering can never be achieved because the real parts of Mie expansion coefficients are always positive. By adding proper gain in dielectric shell, zero-forward scattering can be found at certain incident wavelengths, which means that all electric and magnetic responses in Mie scattering can be counteracted totally in the forward direction. In addition, if the absolute values of dipolar and quadrupolar terms are in the same order of magnitude, the local scattering minimum and maximum can be produced away from the forward and backward directions due to the interacting effect between the dipolar and quadrupolar terms. Furthermore, by adding suitable gain in shell, super-forward scattering can also be realized at certain incident wavelengths. We also demonstrated that anomalously weak scattering or superscattering could be obtained for the core-shell nanoparticles with suitable gain in shell. In particular, for such a choice of suitable gain in shell, we can obtain zero-forward scattering and anomalously weak scattering at the same wavelength as well as super-forward scattering at another wavelength. These features may provide new opportunities for cloaking, plasmonic lasers, optical antennas, and so on.

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Zhang, Xing Fang, et Feng Shou Liu. « Multipolar Surface Plasmon Peaks in Gold Nanoshells ». Applied Mechanics and Materials 730 (janvier 2015) : 137–40. http://dx.doi.org/10.4028/www.scientific.net/amm.730.137.

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The intensities of the dipole, quadrupole and octupole modes for gold nanoshells have been investigated with various dielectric constants for the embedding medium and with various sizes of the nanoshells by means of Mie theory. With the increase in the dielectric constant of embedding medium, it is found that the intensities of all modes become stronger first, and then the higher mode starts to become weak. We also observe with decreasing the core size of a nanoshell with a fixed outer radius, a larger dielectric constant for the embedding medium is needed corresponding to the change of higher mode intensities from stronger to weaker. We have ascribed the changes of the dipole, quadrupole and octupole modes to the competition among the variations of induced surface charges, conduction electrons and oscillation electrons.

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Kreps, Stanislav, Vladimir Shuvayev, Mark Douvidzon, Baheej Bathish, Tom Lenkiewicz Abudi, Amirreza Ghaznavi, Jie Xu, Yang Lin, Lev Deych et Tal Carmon. « Coupled spherical-cavities ». AIP Advances 12, n^o 12 (1 décembre 2022) : 125022. http://dx.doi.org/10.1063/5.0084815.

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In this work, we study theoretically and experimentally optical modes of photonic molecules—clusters of optically coupled spherical resonators. Unlike previous studies, we do not use stems to hold spheres in their positions relying, instead, on optical tweezers to maintain desired structures. The modes of the coupled resonators are excited using a tapered fiber and are observed as resonances with a quality factor as high as 107. Using the fluorescent mapping technique, we observe families of coupled modes with similar spatial and spectral shapes repeating every free spectral range (a spectral separation between adjacent resonances of individual spheres). Experimental results are compared with the results of numerical simulations based on a multi-sphere Mie theory. This work opens the door for developing large arrays of coupled high-Q spherical resonators.

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Lubatsch, Andreas, et Regine Frank. « A Self-Consistent Quantum Field Theory for Random Lasing ». Applied Sciences 9, n^o 12 (18 juin 2019) : 2477. http://dx.doi.org/10.3390/app9122477.

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The spatial formation of coherent random laser modes in strongly scattering disordered random media is a central feature in the understanding of the physics of random lasers. We derive a quantum field theoretical method for random lasing in disordered samples of complex amplifying Mie resonators which is able to provide self-consistently and free of any fit parameter the full set of transport characteristics at and above the laser phase transition. The coherence length and the correlation volume respectively is derived as an experimentally measurable scale of the phase transition at the laser threshold. We find that the process of stimulated emission in extended disordered arrangements of active Mie resonators is ultimately connected to time-reversal symmetric multiple scattering in the sense of photonic transport while the diffusion coefficient is finite. A power law is found for the random laser mode diameters in stationary state with increasing pump intensity.

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Al Sharif, Merilin, Petko Alov, Vessela Vitcheva, Ilza Pajeva et Ivanka Tsakovska. « Modes-of-Action Related to Repeated Dose Toxicity : Tissue-Specific Biological Roles of PPARγLigand-Dependent Dysregulation in Nonalcoholic Fatty Liver Disease ». PPAR Research 2014 (2014) : 1–13. http://dx.doi.org/10.1155/2014/432647.

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Comprehensive understanding of the precise mode of action/adverse outcome pathway (MoA/AOP) of chemicals becomes a key step towards superseding the current repeated dose toxicity testing methodology with new generation predictive toxicology tools. The description and characterization of the toxicological MoA leading to non-alcoholic fatty liver disease (NAFLD) are of specific interest, due to its increasing incidence in the modern society. Growing evidence stresses on the PPARγligand-dependent dysregulation as a key molecular initiating event (MIE) for this adverse effect. The aim of this work was to analyze and systematize the numerous scientific data about the steatogenic role of PPARγ. Over 300 papers were ranked according to preliminary defined criteria and used as reliable and significant sources of data about the PPARγ-dependent prosteatotic MoA. A detailed analysis was performed regarding proteins which PPARγ-mediated expression changes had been confirmed to be prosteatotic by most experimental evidence. Two probable toxicological MoAs from PPARγligand binding to NAFLD were described according to the Organisation for Economic Cooperation and Development (OECD) concepts: (i) PPARγactivation in hepatocytes and (ii) PPARγinhibition in adipocytes. The possible events at different levels of biological organization starting from the MIE to the organ response and the connections between them were described in details.

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Melik-Gaykazyan, Elizaveta V., Maxim R. Shcherbakov, Alexander S. Shorokhov, Isabelle Staude, Igal Brener, Dragomir N. Neshev, Yuri S. Kivshar et Andrey A. Fedyanin. « Third-harmonic generation from Mie-type resonances of isolated all-dielectric nanoparticles ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 375, n^o 2090 (28 mars 2017) : 20160281. http://dx.doi.org/10.1098/rsta.2016.0281.

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Subwavelength silicon nanoparticles are known to support strongly localized Mie-type modes, including those with resonant electric and magnetic dipolar polarizabilities. Here we compare experimentally the efficiency of the third-harmonic generation from isolated silicon nanodiscs for resonant excitation at the two types of dipolar resonances. Using nonlinear spectroscopy, we observe that the magnetic dipolar mode yields more efficient third-harmonic radiation in contrast to the electric dipolar (ED) mode. This is further supported by full-wave numerical simulations, where the volume-integrated local fields and the directly simulated nonlinear response are shown to be negligible at the ED resonance compared with the magnetic one. This article is part of the themed issue ‘New horizons for nanophotonics’.

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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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Wang, Jiao, Tianrong Zhan, Gaoshan Huang, Xugao Cui, Xinhua Hu et Yongfeng Mei. « Tubular oxide microcavity with high-index-contrast walls : Mie scattering theory and 3D confinement of resonant modes ». Optics Express 20, n^o 17 (30 juillet 2012) : 18555. http://dx.doi.org/10.1364/oe.20.018555.

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Okada, Naoki, et James B. Cole. « Simulation of whispering gallery modes in the Mie regime using the nonstandard finite-difference time domain algorithm ». Journal of the Optical Society of America B 27, n^o 4 (3 mars 2010) : 631. http://dx.doi.org/10.1364/josab.27.000631.

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Li, Wang et Zhou. « Adjusting Electric Field Intensity Using Hybridized Dielectric Metamolecule ». Symmetry 11, n^o 10 (14 octobre 2019) : 1285. http://dx.doi.org/10.3390/sym11101285.

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In this paper, we report on achieving the hybridization effect in a Mie-based dielectric metamolecule and provide its physically intuitive picture. Hybridization results in the splitting of the initial overlapping resonance dips, thus leading to two new collective resonance modes. It was observed via the simulated displacement field distribution that the two modes behave as the in-phase and out-of-phase oscillation of two meta-atoms, thus enhancing and suppressing the intensity of the electric field at the gap between two meta-atoms. Moreover, since the two hybridized modes are caused by the interaction effect, the intensities of the electric field can be adjusted by several external factors, like applied forces and temperature. Taking advantage of this easy-equipped dielectric meta-device, certain zones in it can be applied to receive amplified signals and shielded noises of different frequencies in microwave communication fields. Moreover, due to the function of enhancing electric field intensities, it is also promising in wireless charging technology.

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Molet, Pau, Luz Karimé Gil-Herrera, Juan Luis Garcia-Pomar, Niccolò Caselli, Álvaro Blanco, Cefe López et Agustín Mihi. « Large area metasurfaces made with spherical silicon resonators ». Nanophotonics 9, n^o 4 (11 mars 2020) : 943–51. http://dx.doi.org/10.1515/nanoph-2020-0035.

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AbstractHigh-index dielectric nanostructures have emerged as an appealing complement to plasmonic nanostructures, offering similar light management capabilities at the nanoscale but free from the inherent optical losses. Despite the great interest in these all-dielectric architectures, their fabrication still requires cumbersome fabrication techniques that limit their implementation in many applications. Hence, the great interest in alternative scalable procedures. Among those, the fabrication of silicon spheres is at the forefront, with several routes available in the literature. However, the exploitation of the Mie modes sustained by these silicon resonators is limited over large areas by polydispersity or a lack of long-range order. Here, we present an all-dielectric metamaterial fabricated with a low cost and highly scalable technique: a combination of soft imprinting nanolithography and chemical vapor deposition. The resulting all-dielectric metasurface is composed of an array of silicon hemispheres on top of a high refractive index dielectric substrate. This architecture allows the exploitation of high-quality Mie resonances at a large scale due to the high monodispersity of the hemispheres organized in a single crystal two-dimensional lattice. The optical response of the metasurface can be engineered by the design parameters of the nanoimprinted structure. We further demonstrate the potential of this platform to enhance light emission by coupling dye molecules to the sustained Mie resonances and measuring both an eight-fold amplified signal and a triple lifetime reduction.

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Rahman, Md Aziz Ar, Shukui Zhang et Hani E. Elsayed-Ali. « Quantum efficiency enhancement in simulated nanostructured negative electron affinity GaAs photocathodes ». Journal of Applied Physics 133, n^o 2 (14 janvier 2023) : 023105. http://dx.doi.org/10.1063/5.0130884.

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Nanostructured negative electron affinity GaAs photocathodes for a polarized electron source are studied using finite difference time domain optical simulation. The structures studied are nanosquare columns, truncated nanocones, and truncated nanopyramids. Mie-type resonances in the 700–800 nm waveband, suitable for generation of polarized electrons, are identified. At resonance wavelengths, the nanostructures can absorb up to 99% of the incident light. For nanosquare columns and truncated nanocones, the maximum quantum efficiency (QE) at 780 nm obtained from simulation is 27%, whereas for simulated nanopyramids, the QE is ∼21%. The high photocathode quantum efficiency is due to the shift of Mie resonance toward the longer wavelength, leading to increased light absorption. The field profile distribution shows the excitation of dipole and quadrupole modes within the nanostructures at resonant frequencies. This leads to enhanced photoabsorption and photoelectron generation closer to emission surfaces than for a flat photocathode. The enhanced photoabsorption and reduced electron transport distance for the nanostructured photocathode enhance its QE compared to that for the flat surface wafer.

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Tenenev, V. A., T. Raeder et A. A. Chernova. « Incorporation of Fluid Compressibility into the Calculation of the Stationary Mode of Operation of a Hydraulic Device at High Fluid Pressures ». Nelineinaya Dinamika 17, n^o 2 (2021) : 195–209. http://dx.doi.org/10.20537/nd210205.

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This paper is concerned with assessing the correctness of applying various mathematical models for the calculation of the hydroshock phenomena in technical devices for modes close to critical parameters of the fluid. We study the applicability limits of the equation of state for an incompressible fluid (the assumption of constancy of the medium density) to the simulation of processes of the safety valve operation for high values of pressures in the valve. We present a scheme for adapting the numerical method of S. K. Godunov for calculation of flows of incompressible fluids. A generalization of the method for the Mie – Grüneisen equation of state is made using an algorithm of local approximation. A detailed validation and verification of the developed numerical method is provided, and relevant schemes and algorithms are given. Modeling of the hydroshock phenomenon under the valve actuation within the incompressible fluid model is carried out by the openFoam software. The comparison of the results for the weakly compressible

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RAMÍREZ-RODRÍGUEZ, L. P., M. CORTEZ-VALADEZ, J. G. BOCARANDO-CHACON, H. ARIZPE-CHÁVEZ, M. FLORES-ACOSTA, S. VELUMANI et R. RAMÍREZ-BON. « PLASMON RESONANCE AND RAMAN MODES IN Pb NANOPARTICLES OBTAINED IN EXTRACT OF OPUNTIA FICUS-INDICA PLANT ». Nano 09, n^o 06 (août 2014) : 1450070. http://dx.doi.org/10.1142/s1793292014500702.

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Colloidal nanoparticles were obtained by green synthesis, embedded in the Opuntia ficus-indica plant extract. Optical measurements allowed us to detect two absorption bands centered in 230 nm and 298 nm. Agglomerates of Pb nanoparticles have size in the range 2–8 nm. The effective absorption cross section of spherical Pb nanoparticles was calculated by applying the Mie theory for colloidal systems and compared to optical absorption measurements of Pb nanoparticles. The Raman spectrum of the samples after the reduction of Pb , shows a band at low wavenumbers centered at 116 cm-1. Similar bands have been assigned to small Pb and Ag clusters in other experimental results. Additionally, we used the density functional theory (DFT) as well as semi-empirical methods to assign this band to radial breathing modes of Pb metal nanoparticles.

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Peng, Y., K. von Salzen et J. Li. « Simulation of mineral dust aerosol with Piecewise Log-normal Approximation (PLA) in CanAM4-PAM ». Atmospheric Chemistry and Physics 12, n^o 15 (1 août 2012) : 6891–914. http://dx.doi.org/10.5194/acp-12-6891-2012.

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Abstract. A new size-resolved dust scheme based on the numerical method of piecewise log-normal approximation (PLA) was developed and implemented in the fourth generation of the Canadian Atmospheric Global Climate Model with the PLA Aerosol Model (CanAM4-PAM). The total simulated annual global dust emission is 2500 Tg yr−1, and the dust mass load is 19.3 Tg for year 2000. Both are consistent with estimates from other models. Results from simulations are compared with multiple surface measurements near and away from dust source regions, validating the generation, transport and deposition of dust in the model. Most discrepancies between model results and surface measurements are due to unresolved aerosol processes. Biases in long-range transport are also contributing. Radiative properties of dust aerosol are derived from approximated parameters in two size modes using Mie theory. The simulated aerosol optical depth (AOD) is compared with satellite and surface remote sensing measurements and shows general agreement in terms of the dust distribution around sources. The model yields a dust AOD of 0.042 and dust aerosol direct radiative forcing (ADRF) of −1.24 W m−2 respectively, which show good consistency with model estimates from other studies.

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Duan, Xueke, Haoxiang Chen, Yun Ma, Zhiyuan Qian, Qi Zhang, Yun Lai, Ruwen Peng, Qihuang Gong et Ying Gu. « Nesting and degeneracy of Mie resonances of dielectric cavities within zero-index materials ». Journal of Optics 24, n^o 2 (4 janvier 2022) : 025401. http://dx.doi.org/10.1088/2040-8986/ac440c.

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Abstract Resonances in optical cavities are used to manipulate light propagation, enhance light–matter interaction, modulate quantum states, and so on. However, the index contrast between the traditional cavities and the host is generally not high, which to some extent limited their performances. By putting dielectric cavities into a host of zero-index materials, index contrast in principle can approach infinity. Here, we analytically deduced Mie resonance conditions at this extreme circumstance. Interestingly, we discovered a so-called resonance nesting effect, in which a set of cavities with different radii can possess the same type of resonance at the same wavelength. We also revealed previously unknown degeneracy between the 2 l -TM (2 l -TE) and 2 l + 1 -TE ( 2 l + 1 -TM) modes for ɛ ≈ 0 (µ ≈ 0) material, and the 2 l -TM and 2 l -TE for both ɛ ≈ 0 and µ ≈ 0. Such extraordinary resonance nesting and degeneracy provide additional principles to manipulate cavity behaviors.

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Tanaka, Takuo, et Sadahiko Yamamoto. « Optically Induced Meandering Mie Particles Driven by the Beat of Coupled Guided Modes Produced in a Multimode Waveguide ». Japanese Journal of Applied Physics 41, Part 2, No. 3A (1 mars 2002) : L260—L262. http://dx.doi.org/10.1143/jjap.41.l260.

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Saerens, Grégoire, Ngoc My Hanh Duong, Alexander S. Solntsev, Artemios Karvounis, Thomas Dursap, Philippe Regreny, Andrea Morandi et al. « Spontaneous Parametric Down-Conversion from GaAs Nanowires at Telecom Wavelength ». EPJ Web of Conferences 266 (2022) : 08010. http://dx.doi.org/10.1051/epjconf/202226608010.

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We report on the generation of photon pairs at 1550 nm from free-standing epitaxially grown self-assisted micrometre long GaAs nanowires. The efficiency of the spontaneous parametric down-conversion process has a rate of 320 GHz/Wm normalized to the transmission of the setup, the pump intensity, and the volume of the nanostructure. GaAs is a high index dielectric that can support electromagnetic Mie modes, therefore we model how shorter nanowires could improve the second-harmonic signal and we found that sub-micro long nanowires (600 nm length and 250 nm diameter) can support quality factors up to 15 at the pump wavelength (780 nm). We anticipate that the near field enhancement compared to micrometre long nanowires will boost the second-harmonic generation and, correspondingly, the biphoton rate efficiency.

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Peng, Y., K. von Salzen et J. Li. « Simulation of mineral dust aerosol with piecewise log-normal approximation (PLA) in CanAM4-PAM ». Atmospheric Chemistry and Physics Discussions 11, n^o 9 (22 septembre 2011) : 26477–520. http://dx.doi.org/10.5194/acpd-11-26477-2011.

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Abstract. A new size-resolved dust scheme based on the numerical method of piecewise log-normal approximation (PLA) was developed and implemented in the fourth generation of the Canadian Atmospheric Global Climate Model with the PLA Aerosol Module (CanAM4-PAM). The total simulated annual mean dust burden is 37.8 mg m−2 for year 2000, which is consistent with estimates from other models. Results from simulations are compared with multiple surface measurements near and away from dust source regions, validating the generation, transport and deposition of dust in the model. Most discrepancies between model results and surface measurements are due to unresolved aerosol processes. Radiative properties of dust aerosol are derived from approximated parameters in two size modes using Mie theory. The simulated aerosol optical depth (AOD) is compared with several satellite observations and shows good agreements. The model yields a dust AOD of 0.042 and total AOD of 0.126 for the year 2000. The simulated aerosol direct radiative forcings (ADRF) of dust and total aerosol over ocean are −1.24 W m−2 and −4.76 W m−2 respectively, which show good consistency with satellite estimates for the year 2001.

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Gomes, Jorge Pereira, et H. Lienhart. « Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows ». Journal of Fluid Mechanics 715 (9 janvier 2013) : 537–72. http://dx.doi.org/10.1017/jfm.2012.533.

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AbstractSelf-excitation of the motion of a structure has become a prominent aspect of engineering projects over recent years as designers are using materials at their limits, causing structures to become progressively lighter, more flexible and, therefore, prone to vibrate. Stimulated by the increasing interest in fluid–structure interaction (FSI) problems, this study investigated the instability and consequent FSI-induced self-excited oscillation of flexible structures in uniform flows at Reynolds numbers between $10$ and $1. 69\times 1{0}^{5} $. The investigations were performed in both water and a highly viscous syrup ($\nu = 1. 64\times 1{0}^{- 4} ~{\mathrm{m} }^{2} ~{\mathrm{s} }^{- 1} $) and considered three structures of different geometries. The results were conclusive in showing that the motion of the structure was characterized by a sequence of oscillation modes as a function of the characteristics of the structure and flow properties. In addition, it was possible to identify the self-excitation mechanisms as being of the instability-induced excitation (IIE) or movement-induced excitation (MIE) types. IIE was observed to be the most dominant mechanism of excitation at lower velocities and it was defined by a direct relation between the flow fluctuation and natural frequencies of the structure. For that reason, IIE was strongly determined by the geometry of the front body of the structure. At higher velocities, the amplitudes of the flow disturbances generated by the structure movement increased and excitations of the MIE type became predominant for all structures. The MIE mechanism was found to be weakly influenced by the shape of the structure but very sensitive to its dynamic characteristics and to the properties of the fluid, especially the Reynolds number.

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Chatterjee, K., S. Basu et D. Chakravorty. « Plasmon resonance absorption in sulfide-coated gold nanorods ». Journal of Materials Research 21, n^o 1 (1 janvier 2006) : 34–40. http://dx.doi.org/10.1557/jmr.2006.0032.

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Gold nanorods 100 nm in diameter were grown within polycarbonate membranes as templates by the electrodeposition technique. A low-temperature sulfidation process was used to make gold sulfide nanoshells around the nanorods with a thickness of ∼7 nm. Optical absorption measurements were carried out on sulfide-coated gold nanorods obtained by dissolving the polycarbonate membrane. Several peaks were observed. These were analyzed on the basis of longitudinal and transverse modes of gold nanorods, the core–shell structure of gold–gold sulfide, and the presence of nanoparticles of gold. Theoretical analysis was carried out using a modified Mie scattering formalism. Satisfactory agreement between experimental results and theoretical fits were obtained.

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Abujetas, Diego R., Ramón Paniagua-Domínguez et José A. Sánchez-Gil. « Unraveling the Janus Role of Mie Resonances and Leaky/Guided Modes in Semiconductor Nanowire Absorption for Enhanced Light Harvesting ». ACS Photonics 2, n^o 7 (16 juin 2015) : 921–29. http://dx.doi.org/10.1021/acsphotonics.5b00112.

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Zambrana-Puyalto, Xavier, et Gabriel Molina-Terriza. « The role of the angular momentum of light in Mie scattering. Excitation of dielectric spheres with Laguerre–Gaussian modes ». Journal of Quantitative Spectroscopy and Radiative Transfer 126 (septembre 2013) : 50–55. http://dx.doi.org/10.1016/j.jqsrt.2012.10.010.

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Hayata, K., et M. Koshiba. « Superefficient method for generating terahertz radiation by difference-frequency mixing between whispering-gallery modes in a Mie-sized spherical cavity ». Journal of the Optical Society of America B 11, n^o 12 (1 décembre 1994) : 2572. http://dx.doi.org/10.1364/josab.11.002572.

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Nemova, Galina. « Laser Cooling and Trapping of Rare-Earth-Doped Particles ». Applied Sciences 12, n^o 8 (8 avril 2022) : 3777. http://dx.doi.org/10.3390/app12083777.

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This review focuses on optical refrigeration with the anti-Stokes fluorescence of rare-earth (RE)-doped low-phonon micro- and nanocrystals. Contrary to bulk samples, where the thermal energy is contained in internal vibrational modes (phonons), the thermal energy of nanoparticles is contained in both the translational motion and internal vibrational (phonons) modes of the sample. Much theoretical and experimental research is currently devoted to the laser cooling of nanoparticles. In the majority of the related work, only the translational energy of the particles has been suppressed. In this review, the latest achievements in hybrid optical refrigeration of RE-doped low-phonon micro- and nanoparticles are presented. Hybrid cooling permits the suppression of not only the translational energy of the RE-doped particles, but also their internal vibrational phonon thermal energy. Laser cooling of nanoparticles is not a simple task. Mie resonances can be used to enhance laser cooling with the anti-Stokes fluorescence of nanoparticles made of low-phonon RE-doped solids. Laser-cooled nanoparticles is a promising tool for fundamental quantum-mechanical studies, nonequilibrium thermodynamics, and precision measurements of forces.

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