Perfect anomalous reflection using a compound metallic metagrating
Mahdi Rahmanzadeh,Amin Khavasi +1 more
TLDR
In this paper, a compound metallic grating (a periodic metallic structure with more than one slit in each period) is proposed for anomalous reflection, which has an unprecedented near-to-unitary efficiency of 99.9%.Abstract:
Metagrating is a new concept for wavefront manipulation that, unlike phase gradient metasurfaces, does not suffer from low efficiency and also has a less complicated fabrication process. In this paper, a compound metallic grating (a periodic metallic structure with more than one slit in each period) is proposed for anomalous reflection. We propose an analytical method for analyzing the electromagnetic response of this grating. Closed-form and analytical expressions are presented for the reflection coefficients of zeroth diffracted order and also higher diffracted orders. The proposed method is verified against full-wave simulations and the results are in excellent agreement. Thanks to the geometrical asymmetry of compound metallic grating, it can be used for designing anomalous reflection at the normal incidence. Given analytical expressions for reflection coefficients, we design a perfect anomalous reflector for a TM polarized plane wave via transferring all the incident power to ( − 1) diffraction order . The structure designed in this study has an unprecedented near-to-unitary efficiency of 99.9%. Finally, a multi-element compound metallic grating is proposed for reflecting the normal incidence to angles of below 30°, which is a challenging accomplishment. This excellent performance of compound metallic grating shows its high potential for microwave and terahertz wavefront manipulation applications.read more
Citations
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Multi-freedom metasurface empowered vectorial holography
TL;DR: In this paper , a review of vectorial holography empowered by multiple degrees of freedom (DOF) metasurfaces is presented, with a focus on recent advances.
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Dual-Polarized All-Metallic Metagratings for Perfect Anomalous Reflection
Oshri Rabinovich,Ariel Epstein +1 more
TL;DR: In this article, the authors theoretically formulate and experimentally demonstrate the design of metagratings (MGs) composed of periodic rectangular grooves in a metallic medium, intended for perfect anomalous reflection.
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Parallel wave-based analog computing using metagratings
TL;DR: A multi-functional metagrating to modulate both spatial and angular properties of the input signal whereby both symmetric and asymmetric optical transfer functions are realized using high-order space harmonics is proposed.
Journal ArticleDOI
Dual-Polarized All-Metallic Metagratings For Perfect Anomalous Reflection
Oshri Rabinovich,Ariel Epstein +1 more
TL;DR: In this article, the authors theoretically formulate and experimentally demonstrate the design of metagratings (MGs) composed of periodic rectangular grooves in a metallic medium, intended for perfect anomalous reflection.
Journal ArticleDOI
Analytical method for diffraction analysis and design of perfect-electric-conductor backed graphene ribbon metagratings.
TL;DR: In this article, an accurate analytical method is proposed for diffraction analysis of a perfect electric conductor (PEC)-backed array of graphene ribbons, which can predict the electromagnetic performance of the ribbons not only in the subwavelength regime, but also for wavelengths shorter than the array constant.
References
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Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction
Nanfang Yu,Patrice Genevet,Patrice Genevet,Mikhail A. Kats,Francesco Aieta,Francesco Aieta,Jean-Philippe Tetienne,Jean-Philippe Tetienne,Federico Capasso,Zeno Gaburro,Zeno Gaburro +10 more
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Planar Photonics with Metasurfaces
TL;DR: Progress in the optics of metasurfaces is reviewed and promising applications for surface-confined planar photonics components are discussed and the studies of new, low-loss, tunable plasmonic materials—such as transparent conducting oxides and intermetallics—that can be used as building blocks for metAsurfaces will complement the exploration of smart designs and advanced switching capabilities.
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Metasurface holograms reaching 80% efficiency
TL;DR: The design of the hologram integrates a ground metal plane with a geometric metasurface that enhances the conversion efficiency between the two circular polarization states, leading to high diffraction efficiency without complicating the fabrication process.
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Gradient-index meta-surfaces as a bridge linking propagating waves and surface waves
TL;DR: It is demonstrated theoretically and experimentally that a specific gradient-index meta-surface can convert a PW to a SW with nearly 100% efficiency, and may pave the way for many applications, including high-efficiency surface plasmon couplers, anti-reflection surfaces, light absorbers, and so on.
Journal ArticleDOI
High-efficiency broadband anomalous reflection by gradient meta-surfaces.
Shulin Sun,Kuang-Yu Yang,Chih Ming Wang,Ta Ko Juan,Wei Ting Chen,Chun Yen Liao,Qiong He,Shiyi Xiao,Wen Ting Kung,Guang-Yu Guo,Guang-Yu Guo,Lei Zhou,Din Ping Tsai,Din Ping Tsai +13 more
TL;DR: This work combines theory and experiment to demonstrate that a carefully designed gradient meta-surface supports high-efficiency anomalous reflections for near-infrared light following the generalized Snell's law, and the reflected wave becomes a bounded surface wave as the incident angle exceeds a critical value.