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Articles de revues sur le sujet « Metagratings »

Auteur : Grafiati
Publié le 1 février 2025

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1

Uzair, Mohammad, Xiao Li, Yangyang Fu et Chen Shen. « Diffraction in phase gradient acoustic metagratings : multiple reflection and integer parity design ». INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no 3 (1 août 2021) : 3167–75. http://dx.doi.org/10.3397/in-2021-2320.

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Diffraction occurs when acoustic waves are incident on periodic structures such as graded metasurfaces. While numerous interesting diffraction phenomena have been observed and demonstrated, the underlying mechanism of diffraction in these structures is often overlooked. Here we provide a generic explanation of diffraction in phase gradient acoustic metagratings and relate high-order diffractions to multiple reflections in the unit cells. As such, we reveal that the number of unit cells within the metagrating plays a dominant role in determining the diffraction patterns. It is also found that the integer parity of the metagrating leads to anomalous reflection and refraction with high efficiency. The theory is verified by numerical simulations and experiments on planar metagratings and provides a powerful mechanism to manipulate acoustic waves. We further extend the theory to cylindrical waveguides for the control of sound vortices via topological charge in azimuthal metagratings. The relevance of the theory in achieving asymmetric wave control and high absorption is also discussed and verified both numerically and experimentally.
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Tsai, Wei-Cheng, Chia-Hsun Chang, Tai-Cherng Yu, Yi-Hsuan Huang, Chi-Wai Chow, Yu-Heng Hong, Hao-Chung Kuo et Yao-Wei Huang. « High-Efficiency and Large-Angle Homo-Metagratings for the Near-Infrared Region ». Photonics 11, no 5 (24 avril 2024) : 392. http://dx.doi.org/10.3390/photonics11050392.

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Compact photonic devices that integrate metasurfaces with light sources have been widely studied. However, experimental demonstrations of a higher efficiency of integration are still lacking. To enhance the efficiency of light sources integrated with metasurfaces, we employed a forward design optimization method and index matching between the light source and metasurface substrate to design metagratings. To optimize the overall diffraction efficiency, we manipulated the degrees of freedom in phase, the lattice constants, and the number of unit cells. The same material was utilized for the nanostructures and substrate (homo-metagrating) for index matching, while Si and GaAs materials were used for working at 1550 and 940 nm, respectively. The experimental homo-metagratings operating at 1550 nm and made of Si exhibited an overall average efficiency of 51.3% at diffraction angles of 60.3°. On the other hand, experimental homo-metagratings operating at 940 nm and made of GaAs exhibited an overall average efficiency of 52.4% at diffraction angles of 49.3°. This suggests that the future integration of metagratings with a polarization-specific laser can further enhance the overall diffraction efficiency.
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Mei, Jun, Lijuan Fan et Xiaobin Hong. « Elastic Metagratings with Simultaneous Modulation of Reflected and Transmitted Waves ». Crystals 12, no 7 (24 juin 2022) : 901. http://dx.doi.org/10.3390/cryst12070901.

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Elastic metagratings enabling independent and complete control of both reflection and transmission of bulk longitudinal and transverse waves are highly desired in application scenarios such as non-destructive assessment and structural health monitoring. In this work, we propose a kind of simply structured metagrating composed only of elliptical hollow cylinders carved periodically in a steel background. By utilizing the grating diffraction theory and genetic algorithm, we endow these metagratings with the attractive functionality of simultaneous and high-efficiency modulation of every reflection and transmission channel of both longitudinal and transverse waves. Interesting wave-front manipulation effects including pure mode conversion and anomalous deflection along the desired direction are clearly demonstrated through full-wave numerical simulations. Due to its subwavelength thickness and high manipulation efficiency, the proposed metagrating is expected to be useful in the design of multifunctional elastic planar devices.
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Ra’di, Younes, et Andrea Alù. « Nonreciprocal Wavefront Manipulation in Synthetically Moving Metagratings ». Photonics 7, no 2 (18 avril 2020) : 28. http://dx.doi.org/10.3390/photonics7020028.

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We introduce a metasurface platform for nonreciprocal wave manipulation. We study metagratings composed of nonreciprocal bianisotropic particles supporting synthetic motion, which enable nonreciprocal energy transfer between tailored Floquet channels with unitary efficiency. Based on this framework, we derive the required electromagnetic polarizabilities to realize a metagrating supporting space wave circulation with unitary efficiency for free-space radiation and design a microwave metagrating supporting this functionality. The proposed concept opens new research venues to control free-space radiation with high efficiency beyond the limits dictated by Lorentz reciprocity.
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Lin, Chuan-En, Chih-Wei Weng, Chao-Chang Hu et Peichen Yu. « P‐227 : Late‐News Poster : Design Freeform Metagratings for Eye‐glow Attenuation in Diffractive AR Waveguides ». SID Symposium Digest of Technical Papers 55, no 1 (juin 2024) : 1567–69. http://dx.doi.org/10.1002/sdtp.17857.

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We design and integrate free‐form metagratings with irregular nanoscale patterns into diffractive augmented reality (AR) waveguides to achieve simultaneous improvements in eye‐glow attenuation and outcoupling efficiency. The freeform metagrating demonstrates over 40% reduction in eye‐glow while enhancing outcoupling efficiency by 8% compared to the conventional binary grating.
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Ra’di, Younes, et Andrea Alù. « Reconfigurable Metagratings ». ACS Photonics 5, no 5 (12 mars 2018) : 1779–85. http://dx.doi.org/10.1021/acsphotonics.7b01528.

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KOURCHI, Hasna, Simon BERNARD, Farid CHATI et Fernand LéON. « Metagratings for underwater acoustic wavefront manipulation ». INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no 9 (4 octobre 2024) : 2231–39. http://dx.doi.org/10.3397/in_2024_3153.

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Metagratings are flat periodic assemblies of small scatterers, engineered to achieve effects such as steering, beamforming, or absorption. They have recently received attention in both electromagnetism and acoustic fields. In this work, we report the design, modeling, and experimental characterization of metagratings to steer underwater acoustic wavefronts towards anomalous directions (i.e. not classically allowed by Snell-Decartes relationships) with high efficiency (close to 100%). They are build from simple assemblies of small brass cylinders, hold by 3D-printed plastic supports, and can redirect ultrasonic wavefronts either in reflection mode (when placed in front of a reflective surface like e.g. the water / air interface) or in transmission mode. Furthermore, we demonstrate how metagratings build from an asymmetrical pattern of multiple basic elements can achieve near perfect asymmetrical transmission: a wavefront incident from side of the structure is fully transmitted, while a similar wavefront incoming from the other side is fully reflected, achieving an acoustic one-way mirror effect. This work combine theoretical analysis, finite element modeling, and experimentation in water tanks to explore and demonstrate the potential of such metagratings for various applications in underwater acoustics, like communication, noise mitigation, and stealth.
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Panda, Soumyashree S., et Ravi S. Hegde. « A learning based approach for designing extended unit cell metagratings ». Nanophotonics 11, no 2 (8 décembre 2021) : 345–58. http://dx.doi.org/10.1515/nanoph-2021-0540.

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Abstract The possibility of arbitrary spatial control of incident wavefronts with the subwavelength resolution has driven research into dielectric optical metasurfaces in the last decade. The unit-cell based metasurface design approach that relies on a library of single element responses is known to result in reduced efficiency attributed to the inadequate accounting of the coupling effects between meta-atoms. Metasurfaces with extended unit-cells containing multiple resonators can improve design outcomes but their design requires extensive numerical computing and optimizations. We report a deep learning based design methodology for the inverse design of extended unit-cell metagratings. In contrast to previous reports, our approach learns the metagrating spectral response across its reflected and transmitted orders. Through systematic exploration, we discover network architectures and training dataset sampling strategies that allow such learning without requiring extensive ground-truth generation. The one-time investment of model creation can then be used to significantly accelerate numerical optimization of multiple functionalities as demonstrated by considering the inverse design of various spectral and polarization dependent splitters and filters. The proposed methodology is not limited to these proof-of-concept demonstrations and can be broadly applied to meta-atom-based nanophotonic system design and in realising the next generation of metasurface functionalities with improved performance.
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Shramkova, Oksana, Valter Drazic, Guillaume Bourcin, Bobin Varghese, Laurent Blondé et Valérie Allié. « Metagrating solutions for full color single-plate waveguide combiner ». EPJ Applied Metamaterials 9 (2022) : 5. http://dx.doi.org/10.1051/epjam/2022003.

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In this work we propose several full-color metagrating solutions for single waveguide-based Augmented and Virtual Reality near-eye display systems. The presented solutions are based on a combination of reflective and/or transmissive diffraction gratings inside or outside a waveguide. The proposed in-coupler designs have high diffraction efficiency across a wide angular range. Applying our new grating combination solution, we can provide good gathering of diffracted rays for the different colors. We demonstrate that by using a dual-mode symmetrical in-coupling system and angular pupil tiling, we can extend the overall horizontal FoV for three RGB colors. The new characteristics of the full single waveguide system including Eye Pupil Expander and out-coupling components compatible with the proposed in-coupling solutions are discussed. We show that a new nonsymmetrical design of metagratings can be used to change its diffraction properties improving the diffraction efficiency and diffraction uniformity of the optical components.
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10

Raadi, Younes, et Andrea Alu. « Metagratings for Efficient Wavefront Manipulation ». IEEE Photonics Journal 14, no 1 (février 2022) : 1–13. http://dx.doi.org/10.1109/jphot.2021.3136202.

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11

Huang, Tie-Jun, Li-Zheng Yin, Jin Zhao et Pu-Kun Liu. « High-order multipoles in all-dielectric metagrating enabling ultralarge-angle light bending with unity efficiency ». Nanophotonics 10, no 11 (29 juillet 2021) : 2859–73. http://dx.doi.org/10.1515/nanoph-2021-0158.

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Abstract Gradient metasurfaces have been extensively applied in the unprecedented control of light beams over thin optical components. However, these metasurfaces suffer from low efficiency when bending light through large angles and high fabrication demand when it requires fine discretion. In this work, we investigate all-dielectric metagratings based on the generalized Kerker effect induced by interference between Mie-type resonances. It allows extraordinary optical diffraction for beam steering through ultralarge angles. The coupling inside and between the lattices in the metagrating can be used to tune the excited states of the electric and magnetic resonances, including both the fundamental dipoles and high-order multipoles, leading to an ideal asymmetrical scattering pattern that redistributes the energy between the diffraction channels as required. The quadrupole and hexadecapole not only significantly enhance the working efficiency but also enable distinctive possibilities for wave manipulation that cannot be reached by dipoles. Utilizing a thin array of silicon rods, large-angle negative refraction and reflection are realized with almost unity efficiency under both transverse magnetic and transverse electric polarization. Compared with conventional metasurfaces, such an all-dielectric metagrating has the merits of high flexibility, high efficiency, and low fabrication requirements. The coupling and interactions among the multipoles may serve as a foundation for various forms of on-chip optical wave control.
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12

Inampudi, Sandeep, et Hossein Mosallaei. « Neural network based design of metagratings ». Applied Physics Letters 112, no 24 (11 juin 2018) : 241102. http://dx.doi.org/10.1063/1.5033327.

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13

Chiang, Yan Kei, Li Quan, Yugui Peng, Andrea Alu et David Powell. « Acoustic focusing using efficient ultrasonic metagratings ». Journal of the Acoustical Society of America 148, no 4 (octobre 2020) : 2498. http://dx.doi.org/10.1121/1.5146927.

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14

Casolaro, Andrea, Alessandro Toscano, Andrea Alu et Filiberto Bilotti. « Dynamic Beam Steering With Reconfigurable Metagratings ». IEEE Transactions on Antennas and Propagation 68, no 3 (mars 2020) : 1542–52. http://dx.doi.org/10.1109/tap.2019.2951492.

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Fan, Zhiyuan, Maxim R. Shcherbakov, Monica Allen, Jeffery Allen, Brett Wenner et Gennady Shvets. « Perfect Diffraction with Multiresonant Bianisotropic Metagratings ». ACS Photonics 5, no 11 (17 octobre 2018) : 4303–11. http://dx.doi.org/10.1021/acsphotonics.8b00434.

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Panagiotidis, E., E. Almpanis, N. Stefanou et N. Papanikolaou. « Multipolar interactions in Si sphere metagratings ». Journal of Applied Physics 128, no 9 (7 septembre 2020) : 093103. http://dx.doi.org/10.1063/5.0012827.

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Wan, Wenqiang, Wen Qiao, Donglin Pu, Ruibin Li, Chinhua Wang, Yueqiang Hu, Huigao Duan, L. Jay Guo et Linsen Chen. « Holographic Sampling Display Based on Metagratings ». iScience 23, no 1 (janvier 2020) : 100773. http://dx.doi.org/10.1016/j.isci.2019.100773.

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18

Rabinovich, Oshri, et Ariel Epstein. « Nonradiative subdiffraction near-field patterns using metagratings ». Applied Physics Letters 118, no 13 (29 mars 2021) : 131105. http://dx.doi.org/10.1063/5.0043484.

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Deng, Zi-Lan, Xiao-Chen Qiao, Ya-Bin Chen, Tan Shi, Xiangping Li et Jian-Wen Dong. « Lasing action in Fano-resonant superlattice metagratings ». Journal of Physics D : Applied Physics 54, no 34 (10 juin 2021) : 345101. http://dx.doi.org/10.1088/1361-6463/ac055a.

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Chen, Xuan, Min Li, Wenchao Chen, Haochen Yang, Zhicheng Pei, Er‐Ping Li, Hongsheng Chen et Zuojia Wang. « Broadband Janus Scattering from Tilted Dipolar Metagratings ». Laser & ; Photonics Reviews 16, no 3 (20 janvier 2022) : 2100369. http://dx.doi.org/10.1002/lpor.202100369.

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Agner, Mary Alexandra. « Neural nets enhance the accessibility of metagratings ». Scilight 2018, no 24 (11 juin 2018) : 240002. http://dx.doi.org/10.1063/1.5043413.

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Rabinovich, Oshri, et Ariel Epstein. « Arbitrary Diffraction Engineering With Multilayered Multielement Metagratings ». IEEE Transactions on Antennas and Propagation 68, no 3 (mars 2020) : 1553–68. http://dx.doi.org/10.1109/tap.2019.2950813.

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Liu, Bingyi, Zhiling Zhou, Yongtian Wang, Thomas Zentgraf, Yong Li et Lingling Huang. « Experimental verification of the acoustic geometric phase ». Applied Physics Letters 120, no 21 (23 mai 2022) : 211702. http://dx.doi.org/10.1063/5.0091474.

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Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges. In this work, we utilize two acoustic nonlocal metagratings that could support a direct conversion between an acoustic plane wave and a designated vortex mode to obtain the acoustic geometric phase, in which an orbital angular momentum conversion process plays a vital role. In addition, we realize the acoustic geometric phases of different orders by merely varying the orientation angle of the acoustic nonlocal metagratings. Intriguingly, according to our developed theory, we reveal that the reflective acoustic geometric phase, which is twice the transmissive one, can be readily realized by transferring the transmitted configuration to a reflected one. Both the theoretical study and experimental measurements verify the announced transmissive and reflective acoustic geometric phases. Moreover, the reconfigurability and continuous phase modulation that covers the 2π range shown by the acoustic geometric phases provide us with the alternatives in advanced acoustic wavefront control.
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Song, Kun, Ruonan Ji, Duman Shrestha, Changlin Ding, Yahong Liu, Weiren Zhu, Wentao He et al. « High-Efficiency and Wide-Angle Versatile Polarization Controller Based on Metagratings ». Materials 12, no 4 (19 février 2019) : 623. http://dx.doi.org/10.3390/ma12040623.

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Metamaterials with their customized properties enable us to efficiently manipulate the polarization states of electromagnetic waves with flexible approaches, which is of great significance in various realms. However, most current metamaterial-based polarization controllers can only realize single function, which has extremely hindered the expansion of their applications. Here, we experimentally demonstrate highly efficient and multifunctional polarization conversion effects using metagrating by integrating single-structure metallic meta-atoms into the dielectric gratings. Benefiting from the combined advantages of the gratings and the metamaterials, the considered metagrating can operate in transmission and reflection modes simultaneously, acting as a high-performance and wide-angle quarter-wave or half-wave plate with distinct functions in different frequency bands. This metagrating structure is scalable to other frequency ranges and may provide opportunities to design compact multifunctional optical polarization control devices.
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Hao, Zhanlei, Shan Zhu, Cheng-Wei Qiu, Yadong Xu et Huanyang Chen. « Vortex localization and OAM selective conversion via cylindrical metagratings ». Chinese Optics Letters 22, no 3 (2024) : 033601. http://dx.doi.org/10.3788/col202422.033601.

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Kim, Shin Young, Woorim Lee, Joong Seok Lee et Yoon Young Kim. « Longitudinal wave steering using beam-type elastic metagratings ». Mechanical Systems and Signal Processing 156 (juillet 2021) : 107688. http://dx.doi.org/10.1016/j.ymssp.2021.107688.

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Lu, Yu-jing, Hong-yu Zou, Jiao Qian, Yin Wang, Yong Ge, Shou-qi Yuan, Hong-xiang Sun et Xiao-jun Liu. « Multifunctional reflected lenses based on aperiodic acoustic metagratings ». Applied Physics Letters 119, no 17 (25 octobre 2021) : 173501. http://dx.doi.org/10.1063/5.0068015.

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Zeng, Long-Sheng, Ya-Xi Shen, Xin-Sheng Fang, Yong Li et Xue-Feng Zhu. « Experimental realization of ultrasonic retroreflection tweezing via metagratings ». Ultrasonics 117 (décembre 2021) : 106548. http://dx.doi.org/10.1016/j.ultras.2021.106548.

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Peng, Chenyu, Liang Li, Qifeng Qiao, Christopher Yap et Guangya Zhou. « Multifunctional silicon metagratings based on multiple periodicity design ». Journal of Optics 22, no 4 (16 mars 2020) : 045103. http://dx.doi.org/10.1088/2040-8986/ab7b03.

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Peng, Chenyu, Chuhuan Feng, Ji Xia, Christopher Yap et Guangya Zhou. « Near-infrared Fano resonance in asymmetric silicon metagratings ». Journal of Optics 22, no 9 (31 juillet 2020) : 095102. http://dx.doi.org/10.1088/2040-8986/aba3b7.

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Fu, Yangyang, Yanyan Cao et Yadong Xu. « Multifunctional reflection in acoustic metagratings with simplified design ». Applied Physics Letters 114, no 5 (4 février 2019) : 053502. http://dx.doi.org/10.1063/1.5083081.

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Craig, Steven R., Xiaoshi Su, Andrew Norris et Chengzhi Shi. « Observation of asymmetric scattering in acoustic bianisotropic metagratings ». Journal of the Acoustical Society of America 146, no 4 (octobre 2019) : 2786. http://dx.doi.org/10.1121/1.5136652.

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Neder, Verena, Younes Ra’di, Andrea Alù et Albert Polman. « Combined Metagratings for Efficient Broad-Angle Scattering Metasurface ». ACS Photonics 6, no 4 (18 mars 2019) : 1010–17. http://dx.doi.org/10.1021/acsphotonics.8b01795.

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Pors, Anders, Michael G. Nielsen et Sergey I. Bozhevolnyi. « Plasmonic metagratings for simultaneous determination of Stokes parameters ». Optica 2, no 8 (6 août 2015) : 716. http://dx.doi.org/10.1364/optica.2.000716.

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Qian, Jiao, Jian‐Ping Xia, Hong‐Xiang Sun, Yin Wang, Yong Ge, Shou‐Qi Yuan, Yihao Yang, Xiao‐Jun Liu et Baile Zhang. « Aperiodic Metagratings for High‐Performance Multifunctional Acoustic Lenses ». Advanced Materials Technologies 5, no 12 (5 novembre 2020) : 2000542. http://dx.doi.org/10.1002/admt.202000542.

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Zou, Hong-yu, Jiao Qian, Jianping Xia, Shuai Gu, Yu-jing Lu, Yong Ge, Shou-qi Yuan et al. « Refraction/reflection reversal in two-dimensional acoustic metagratings ». Journal of the Acoustical Society of America 156, no 3 (1 septembre 2024) : 1920–28. http://dx.doi.org/10.1121/10.0028524.

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Unlike acoustic metasurfaces that rely solely on phase gradients, acoustic metagratings (AMs) operate based on both phase gradients and grating diffraction, thus further extending the generalized Snell's law (GSL). In particular, AMs can achieve reversal of refraction and reflection based on the parity of the number of wave propagations inside the AMs. So far, discussions of this GSL extension have largely been applied to one-dimensional periodic AMs, while the designs of two-dimensional (2D) periodic AMs and their performance in three-dimensional (3D) space have been quite limited. Here, we study the GSL extension in 3D space and experimentally demonstrate a series of functional 2D periodic AMs. The designed AMs can achieve sound refraction/reflection under any incidence angle in 3D space, without restrictions to certain critical ranges; adjusting incident angles only enables the reversal of refraction and reflection. Additionally, we demonstrate two types of dual-layer sound lenses based on two AMs, whose reversal of refraction and reflection can be realized by simply attaching or separating the two AMs. Our work paves the way to complex 3D wavefront manipulation of AMs, which may find potential use in practical acoustic devices.
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Deng, Zi-Lan, Xuan Ye, Hao-Yang Qiu, Qing-An Tu, Tan Shi, Ze-Peng Zhuang, Yaoyu Cao et al. « Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance ». Nanoscale 12, no 40 (2020) : 20604–9. http://dx.doi.org/10.1039/d0nr05745b.

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Shi, Qiangshi, Xia Jin, Yangyang Fu, Qiannan Wu, Cheng Huang, Baoyin Sun, Lei Gao et Yadong Xu. « Optical beam splitting and asymmetric transmission in bi-layer metagratings ». Chinese Optics Letters 19, no 4 (2021) : 042602. http://dx.doi.org/10.3788/col202119.042602.

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Quan, Jiaqi, Lin Xu, Yangyang Fu, Lei Gao, Huanyang Chen et Yadong Xu. « Integer multi-wavelength gradient phase metagrating for perfect refraction : Phase choice freedom in supercell ». Journal of the Acoustical Society of America 156, no 5 (1 novembre 2024) : 2982–88. http://dx.doi.org/10.1121/10.0034239.

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Phase gradient metagratings (PGMs) reshape the impinging wavefront though the interplay between the linear adjacent phase increment inside supercells and the grating diffraction of supercells. However, the adjacent phase increment is elaborately designed by tuning the resonance of each subcell at a certain target frequency, which inevitably confines PGMs to operate only at the single frequency in turn. We notice that there exists a freedom of phase choice with a multi-2π increment in a supercell of PGMs, whereas conventional designs focus on the 2π increment. This freedom can induce a collaborative mechanism of surface impedance matching and multi-wavelength subcells, enabling the design of PGMs at multi-wavelengths. We further design and fabricate a supercell consisting of eight curved pipes to construct the two-wavelengths PGMs. The linear adjacent phase gradient of 0.25π at the fundamental frequency 3430 Hz is achieved, while the almost perfect transmission effect is observed due to the impedance match at the ends of curved pipes. In addition, the transmission field at the double frequency 6860 Hz is measured, whose refraction direction is consistent with that at 3430 Hz. This design strategy originated from phase choice freedom in the supercell and the experimental fabrication might stimulate applications on other multi-wavelength metasurfaces/metagratings.
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Deng Zilan, 邓子岚, 李枫竣 Li Fengjun, 史坦 Shi Tan et 汪国平 Wang Guoping. « Metagratings for Controlling Diffractive Optical Fields : Physics and Applications ». Acta Optica Sinica 41, no 8 (2021) : 0823011. http://dx.doi.org/10.3788/aos202141.0823011.

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Wan, Wenqiang, Minghui Luo et Yanfeng Su. « Ultrathin polarization-insensitive, broadband visible absorber based rectangular metagratings ». Optics Communications 458 (mars 2020) : 124857. http://dx.doi.org/10.1016/j.optcom.2019.124857.

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Sell, David, Jianji Yang, Sage Doshay, Rui Yang et Jonathan A. Fan. « Large-Angle, Multifunctional Metagratings Based on Freeform Multimode Geometries ». Nano Letters 17, no 6 (3 mai 2017) : 3752–57. http://dx.doi.org/10.1021/acs.nanolett.7b01082.

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Shi, Tan, Yujie Wang, Zi‐Lan Deng, Xuan Ye, Zhenxing Dai, Yaoyu Cao, Bai‐Ou Guan, Shumin Xiao et Xiangping Li. « All‐Dielectric Kissing‐Dimer Metagratings for Asymmetric High Diffraction ». Advanced Optical Materials 7, no 24 (22 octobre 2019) : 1901389. http://dx.doi.org/10.1002/adom.201901389.

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Donda, Krupali D., et Ravi S. Hegde. « OPTIMAL DESIGN OF BEAM-DEFLECTORS USING EXTENDED UNIT-CELL METAGRATINGS ». Progress In Electromagnetics Research M 77 (2019) : 83–92. http://dx.doi.org/10.2528/pierm18092801.

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Wu, QianNan, HaoHao Chen, YanYan Cao, Shan Zhu, Baoyin Sun et Yadong Xu. « Broadband optical negative refraction based on dielectric phase gradient metagratings ». Journal of Physics D : Applied Physics 54, no 44 (13 août 2021) : 445101. http://dx.doi.org/10.1088/1361-6463/ac1aa0.

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Rajabalipanah, Hamid, et Ali Abdolali. « Analytical design for full-space spatial power dividers using metagratings ». Journal of the Optical Society of America B 38, no 10 (13 septembre 2021) : 2915. http://dx.doi.org/10.1364/josab.437379.

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Li, Xiao, Daxing Dong, Jiaqing Liu, Youwen Liu et Yangyang Fu. « Perfect retroreflection assisted by evanescent guided modes in acoustic metagratings ». Applied Physics Letters 120, no 15 (11 avril 2022) : 151701. http://dx.doi.org/10.1063/5.0084253.

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An acoustic metagrating (MG) constructed with an inverse-design scheme can be used to realize anomalous reflection, but its efficiency is limited. In this work, we find that the evanescent guided modes are an important component of achieving perfect retroreflection in an MG. Considering the evanescent first-order guided mode, we derive an alternative inverse-design condition to produce perfect retroreflection and improved performance in the MG parameter space compared with the traditional method. We further investigate the corresponding contribution ratios of the guided modes to perfect retroreflection and find an orthogonal relationship between the contribution ratios of odd and even guided modes. These findings are confirmed using analytical calculations and numerical simulations.
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Yin, Li-Zheng, Jin Zhao, Feng-Yuan Han, Di Wang, Tie-Jun Huang et Pu-Kun Liu. « Transformation of Equivalent Graphene Plasmonics for Metagratings and Hyperbolic Metamaterials ». ACS Applied Nano Materials 5, no 1 (7 janvier 2022) : 1148–60. http://dx.doi.org/10.1021/acsanm.1c03764.

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Jing, Liqiao, Zuojia Wang, Xiao Lin, Bin Zheng, Su Xu, Lian Shen, Yihao Yang, Fei Gao, Min Chen et Hongsheng Chen. « Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings ». Research 2019 (27 février 2019) : 1–8. http://dx.doi.org/10.34133/2019/3806132.

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Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, and free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures similar to deoxyribonucleic acid (DNA), in order to understand the interplay between electrons, photons, and object chirality. Spiral field patterns can be generated while introducing a gradient azimuthal phase distribution to the induced electric dipole array at the cylindrical interface. Experimental measurements show efficient control over angular momentum of the radiated field at microwave regime, utilizing a phased electromagnetic dipole array to mimic moving charged particles. The angular momentum of the radiated wave is determined solely by the handedness of the helical structure, and it thus serves as a potential candidate for the detection of chiral objects. Our findings not only pave a way for design of orbital angular momentum free-electron lasers but also provide a platform to study the interplay between swift electrons with chiral objects.
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Fu, Yangyang, Chen Shen, Xiaohui Zhu, Junfei Li, Youwen Liu, Steven A. Cummer et Yadong Xu. « Sound vortex diffraction via topological charge in phase gradient metagratings ». Science Advances 6, no 40 (octobre 2020) : eaba9876. http://dx.doi.org/10.1126/sciadv.aba9876.

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Wave fields with orbital angular momentum (OAM) have been widely investigated in metasurfaces. By engineering acoustic metasurfaces with phase gradient elements, phase twisting is commonly used to obtain acoustic OAM. However, it has limited ability to manipulate sound vortices, and a more powerful mechanism for sound vortex manipulation is strongly desired. Here, we propose the diffraction mechanism to manipulate sound vortices in a cylindrical waveguide with phase gradient metagratings (PGMs). A sound vortex diffraction law is theoretically revealed based on the generalized conservation principle of topological charge. This diffraction law can explain and predict the complicated diffraction phenomena of sound vortices, as confirmed by numerical simulations. To exemplify our findings, we designed and experimentally verified a PGM based on Helmholtz resonators that support asymmetric transmission of sound vortices. Our work provides previously unidentified opportunities for manipulating sound vortices, which can advance more versatile design for OAM-based devices.
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