Gotowe bibliografie tematyczne / Metagratings

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Gotowa bibliografia na temat „Metagratings”

Autor: Grafiati

Data publikacji: 1 lutego 2025

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Artykuły w czasopismach na temat "Metagratings"

Uzair, Mohammad, Xiao Li, Yangyang Fu i Chen Shen. "Diffraction in phase gradient acoustic metagratings: multiple reflection and integer parity design". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, nr 3 (1.08.2021): 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 i Yao-Wei Huang. "High-Efficiency and Large-Angle Homo-Metagratings for the Near-Infrared Region". Photonics 11, nr 5 (24.04.2024): 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 i Xiaobin Hong. "Elastic Metagratings with Simultaneous Modulation of Reflected and Transmitted Waves". Crystals 12, nr 7 (24.06.2022): 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, i Andrea Alù. "Nonreciprocal Wavefront Manipulation in Synthetically Moving Metagratings". Photonics 7, nr 2 (18.04.2020): 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 i 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, nr 1 (czerwiec 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, i Andrea Alù. "Reconfigurable Metagratings". ACS Photonics 5, nr 5 (12.03.2018): 1779–85. http://dx.doi.org/10.1021/acsphotonics.7b01528.

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KOURCHI, Hasna, Simon BERNARD, Farid CHATI i Fernand LéON. "Metagratings for underwater acoustic wavefront manipulation". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, nr 9 (4.10.2024): 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., i Ravi S. Hegde. "A learning based approach for designing extended unit cell metagratings". Nanophotonics 11, nr 2 (8.12.2021): 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 i 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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Raadi, Younes, i Andrea Alu. "Metagratings for Efficient Wavefront Manipulation". IEEE Photonics Journal 14, nr 1 (luty 2022): 1–13. http://dx.doi.org/10.1109/jphot.2021.3136202.

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Rozprawy doktorskie na temat "Metagratings"

Tan, Zhen. "Electromagnetic metagratings for efficient wavefront manipulation". Electronic Thesis or Diss., Paris 10, 2024. http://www.theses.fr/2024PA100031.

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Par rapport aux métasurfaces traditionnelles, les métaréseaux ont démontré des avantages prononcés dans la manipulation efficace du front d’onde au cours de ces dernières années. Ces avantages découlent principalement de deux facteurs clés : premièrement, les métaréseaux éliminent efficacement la désadaptation d’impédance d’onde entre les ondes entrantes et sortantes, permettant ainsi d’avoir une efficacité quasi-optimale dans la manipulation du front d’onde. Deuxièmement, la structure simplifiée et éparse des métaréseaux les rend beaucoup plus faciles à réaliser que les métasurfaces traditionnelles, qui impliquent souvent des exigences de résolution structurelle complexes, en particulier à des fréquences élevées. Cette thèse s’efforce d’établir une méthodologie de conception plus intuitive et plus rigoureuse pour la manipulation du front d’onde basée sur les métaréseaux, tout en explorant de nouvelles voies dans le domaine. Menée conjointement par l’Université Paris Nanterre et Xi’an Jiaotong University, l’étude commence par une analyse complète des caractéristiques électromagnétiques inhérentes aux métaréseaux, visant à clarifier les principes fondamentaux régissant la manipulation du front d’onde. Cette analyse englobe la dérivation des coefficients de réflexion et de transmission dans les milieux multicouches, l’analyse des caractéristiques du rayonnement et des considérations méticuleuses pour obtenir une manipulation optimale du front d’onde. Les travaux de recherche portent sur les subtilités de la conception des métaréseaux réfléchissants, en abordant les défis et en concevant des stratégies pour les rayonnements mono- et multi-faisceaux et pour l’absorption électromagnétique, en explorant l’influence de diverses configurations structurelles sur la bande passante d’absorption. Notamment, le concept de métaréseaux à impédance de charge nulle est introduit et des applications potentielles sont explorées, en particulier dans les scénarios à hautes fréquences. Enfin, les travaux de recherche étendent leur exploration aux métaréseaux transmissifs, dans le but de démontrer leurs capacités à réaliser diverses manipulations, englobant la réflexion anormale, la réfraction anormale, la division du faisceau, l’absorption d’ondes unidirectionnelle et bidirectionnelle et la manipulation asymétrique du front d’onde
Compared to traditional metasurfaces, metagratings have demonstrated pronounced advantages in efficient wavefront manipulation in recent years. These advantages primarily stem from two key factors: first, metagratings effectively eliminate wave impedance mismatch between incoming and outgoing waves, thus facilitating near-optimal efficiency in wavefront manipulation. Second, the sparsely arranged and simplified structure of metagratings renders them significantly easier to fabricate compared to traditional metasurfaces, which often entail complex structural resolution requirements particularly at high frequencies. This doctoral research endeavors to establish a more intuitive and rigorous design methodology for metagrating-based wavefront manipulation while also exploring novel avenues in the domain. Conducted jointly by Université Paris Nanterre and Xi’an Jiaotong University, the study starts with a comprehensive analysis of the electromagnetic characteristics inherent to metagratings, aiming to elucidate the fundamental principles governing wavefront manipulation. This analysis encompasses the derivation of reflection and transmission coefficients in multilayered media, examination of radiation characteristics, and meticulous considerations for achieving optimal wavefront manipulation. Subsequent investigations deal with the design intricacies of reflective metagratings, addressing challenges and devising strategies for both single-beam and multi-beam radiations and for electromagnetic absorption, exploring the influence of diverse structural configurations on absorption bandwidth. Notably, the concept of zero load-impedance metagratings is introduced and potential applications are explored particularly in high-frequency band scenarios. Finally, the research extends its exploration to transmissive metagratings, aiming to demonstrate their capabilities in achieving diverse wavefront manipulations, encompassing anomalous reflection, anomalous refraction, beam splitting, uni- and bi-directional wave absorption, and asymmetrical wavefront manipulation

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Kourchi, Hasna. "Μétaréseaux pοur la réflexiοn et la transmissiοn anοrmales de frοnts d’οnde acοustique dans l’eau". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH36.

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Un métaréseau est un assemblage périodique de diffuseurs conçu pour réfléchir ou réfracter une onde vers une direction anormale, non prévue par les lois de Snell-Descartes. Dans ce travail, nous avons conçu, fabriqué et caractérisé expérimentalement de tels métaréseaux pour le contrôle des ondes ultrasonores dans l’eau, en utilisant des tubes et des cylindres en laiton ainsi que des supports plastiques imprimés en 3D. Ces métaréseaux permettent de rediriger un front d'onde incident vers une direction arbitraire souhaitée, avec une efficacité élevée (proche de 100 %), aussi bien en réflexion sur une surface (comme l’interface eau/air) qu'en transmission. L’approche théorique repose sur les principes de la diffraction de Bragg et sur les interactions constructives et destructives des ondes. Les résultats de cette thèse démontrent l'efficacité des métaréseaux à induire des phénomènes acoustiques tels que la rétro-réflexion et la réponse asymétrique, grâce à l’utilisation de structures résonantes et non résonantes, validées par des simulations par éléments finis et des expérimentations. Cette recherche ouvre de nouvelles perspectives pour la manipulation des ondes acoustiques sous-marines, avec des applications potentielles dans les domaines de la détection, de l'absorption et de la réflexion des ondes en milieu marin
A metagrating is a periodic assembly of scatterers designed to reflect or refract a wave toward an anomalous direction, not predicted by Snell's law. In this work, we designed, fabricated, and experimentally characterized such metagratings for the control of ultrasonic waves in water, using brass tubes and cylinders as well as 3D-printed plastic supports. These metagratings enable the redirection of an incident wavefront to an arbitrarily desired direction with high efficiency (close to 100%), both in reflection on a surface (e.g., the water/air interface) and in transmission. The theoretical approach is based on the principles of Bragg diffraction and constructive and destructive wave interactions. The results of this thesis demonstrate the efficiency of metagratings in inducing acoustic phenomena such as retroreflection and asymmetric wave response, achieved through the use of resonant and non-resonant structures, validated by finite element simulations and experiments. This research opens new perspectives for the manipulation of underwater acoustic waves, with potential applications in the fields of wave detection, absorption, and reflection in marine environments

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Papou, Uladzislau. "Conformal and reconfigurable sparse metasurfaces : advanced analytical models and antenna applications". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC027.

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Cette thèse de doctorat traite des métasurfaces constituées de diffuseurs sub-longueur d’onde conçus pour contrôler les fronts d’ondes électromagnétiques. Elle introduit des modèles analytiques et numériques inédits qui résolvent le problème de diffusion inverse en tenant compte des interactions entre éléments de la métasurface. Le manuscrit se concentre plus particulièrement sur des réseaux, périodiques ou non, de fils structurés, permettant la réalisation d’antennes reconfigurables électroniquement. Le manuscrit est divisé en deux grandes parties, l’une sur des arrangements périodiques de fils appelés métaréseaux et l’autre sur des métasurfaces éparses sans caractère périodique. Dans les deux cas, des réalisations expérimentales dans le domaine microondes viennent appuyer les développements théoriques. Dans la première partie, les conditions théoriques conduisant à un contrôle total des ordres de diffraction rayonnés par des métaréseaux, dont la période est composée de plusieurs fils structurés individuellement, sont établies et l’importance du contrôle du champ proche est alors soulignée. Par ailleurs, une expression analytique des paramètres effectifs des fils, s’appuyant sur une simulation numérique, a également été établie. Il devient ainsi possible d’exploiter des géométries quelconques pour des métaréseaux fonctionnant dans les domaines allant des microondes à l’optique. Dans la deuxième partie de la thèse, le modèle analytique des métaréseaux, réservé aux distributions périodiques planes, est généralisé aux distributions non périodiques de fils disposés sur des surfaces quelconques en s’appuyant sur le calcul de la fonction de Green. Ce concept est appliqué à des métasurfaces éparses intervenant dans une cavité Fabry-Perot ou dans une antenne semi-cylindrique. Enfin, la démarche est utilisée pour concevoir une métasurface éparse plane reconfigurable. Un prototype a été réalisé et utilisé pour démontrer expérimentalement le contrôle dynamique de l’onde, en champ lointain et en champ proche, via des applications telles que le dépointage de faisceau, la création de faisceaux multiples ou encore la focalisation au-delà de la limite de diffraction
This PhD thesis deals with electromagnetic metasurfaces for wavefront manipulation represented by arrays of scatterers engineered at subwavelength scale. The manuscript develops novel analytical and numerical models that allow one to solve the inverse scattering problem by taking into account all interactions between elements of a metasurface. Specifically, the manuscript focuses on sparse arrays, periodic or not, of structured wires for the application to electronically reconfigurable antennas. The manuscript is divided into two main parts, one on periodic arrangements of wires called metagratings and one on sparse metasurfaces when there is no periodicity imposed. Each part is endorsed by experiments performed at microwave frequencies. In the first part, theoretical conditions for arbitrary control of the diffraction patterns with metagratings, whose period is composed of multiple individually-engineered wires, are established and importance of the near-field regulation is highlighted. Moreover, an analytical retrieval technique is developed and allows one to consider, with the help of full-wave simulations, arbitrarily structured wires for metagratings operating from microwave to optical domains. In the second part of the thesis, the analytical model of metagratings is generalized, from planar periodic, to arbitrarily-shaped non-periodic distributions of wires by means of numerical calculation of a Green’s function. The concept is applied to design sparse metasurfaces in Fabry-Perot cavity and semi-cylindrical antenna configurations. Finally, the approach is applied to design a reconfigurable planar sparse metasurface. A fabricated sample is exploited to experimentally demonstrate dynamic control of the far-field radiation pattern and the near-field intensity distribution. As such beam-steering, multi-beam manipulation and subdiffraction focusing are shown

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Części książek na temat "Metagratings"

Deng, Zi-Lan, Xiangping Li i Guixin Li. "Surface-Wave and Metagrating Holography". W Metasurface Holography, 51–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-031-02386-6_6.

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Rane, Shreeya, i Dibakar Roy Chowdhury. "Excitation of Evanescent Orders by Employing Metallic Metagrating". W Lecture Notes in Electrical Engineering, 101–5. Singapore: Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-4760-3_15.

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Zhang, Hong, Yuancheng Fan, Yali Zeng, Zhehao Ye, Hao Yue, Weixi Qiu, Ziyi Xu, Zhenning Yang i Fuli Zhang. "Broadband and Wide-Angle Terahertz Metagrating Based on Fractal Structure". W Springer Proceedings in Physics, 161–65. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-3913-4_31.

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Streszczenia konferencji na temat "Metagratings"

Zhang, Ruimeng, Jiahui Ji, Ziang Jiang, Shixiong Wang i Jianjia Yi. "Microwave Bifunctional Polarization-selective Metagratings". W 2024 Photonics & Electromagnetics Research Symposium (PIERS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/piers62282.2024.10618632.

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Zhou, Wei, i Xiao Ji. "Design of Reconfigurable Dual Polarized Metagratings". W 2024 International Applied Computational Electromagnetics Society Symposium (ACES-China), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/aces-china62474.2024.10699757.

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Foteinopoulou, Stavroula. "Polarized asymmetric transmission with passive all-dielectric metagratings". W Laser Science, LW7F.3. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/ls.2024.lw7f.3.

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We present a mechanism to asymmetric transmission which neither requires breaking reciprocity nor does it require a polarization rotation. We demonstrate the phenomenon with an all-dielectric metagrating for both TE and TM light.

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de Galarreta, Carlota Ruiz, Joe Shields, Miguel Alvarez Alegria, C. David Wright, Rosalia Serna i Jan Siegel. "Tailoring the Diffraction Characteristics of Reflective Metagratings Employing One-Step Residue-Free UV Laser Interference Patterning". W CLEO: Applications and Technology, JTu2A.182. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jtu2a.182.

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We demonstrate a single step, cost efficient, and residue free UV-interferometric technique for the instantaneous fabrication of high performance, near infrared metagratings with tailored diffraction properties both in terms of dispersion and efficiency.

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Marcus, Sherman W., i Ariel Epstein. "Frequency-Agile Sliding Metagratings for Dynamic Wave Control". W 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 79–80. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10686881.

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Ponti, Cristina, i Nikolaos L. Tsitsas. "Achieving Anomalous Refraction with Truncated All-Dielectric Two-Element Metagratings". W 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 81–82. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10685943.

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Marcus, Sherman W., i Ariel Epstein. "Sliding Metagratings for Dynamic Beam Switching via Rigorous Floquet-Bloch Theory". W 2024 IEEE International Conference on Microwaves, Communications, Antennas, Biomedical Engineering and Electronic Systems (COMCAS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/comcas58210.2024.10666190.

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Wang, Shaojie, Ke Chen i Yijun Feng. "Frequency Beam Scanning with Wideband Dualpolarized Metagratings for Large-angle Incidence". W 2024 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/icmmt61774.2024.10672309.

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Zhu, Jiang, Wei Wei, Bo Chen, Ping Tang, Xiangyu Zhao i Chongzhao Wu. "Three-dimensional metagratings integrated with liquid-galinstan for surface-enhanced infrared sensing". W 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1–2. IEEE, 2024. http://dx.doi.org/10.1109/irmmw-thz60956.2024.10697875.

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Zhang, Cong, i Wen Qiao. "Large-format optical encryption device of vector light field based on pixelated metagratings". W 4th International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2024), redaktorzy Suihu Dang i Manuel Filipe Costa, 41. SPIE, 2024. http://dx.doi.org/10.1117/12.3040046.

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