Perfect anomalous reflectors at optical frequencies

He, Tao; Liu, Tong; Xiao, Shiyi; Wei, Zeyong; Wang, Zhanshan; Zhou, Lei; Cheng, Xinbin

doi:10.1126/sciadv.abk3381

Cited by 51 publications

(30 citation statements)

References 47 publications

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“…It is also worth noting that research on the multiple mode coupling effect between adjacent meta-atoms designed by AI is quite important to the accurate manipulation of EM response. The efficiency of metasurfaces may be further improved when meta-atoms are automatically designed and arranged by AI in considering the coupling effect [190,191] . For example, different Bloch waves and propagating waves are carefully manipulated by means of the coupling effect between meta-atoms, hence realizing the design of perfect anomalous reflectors.…”

Section: Meta-atom Design Using Artificial Intelligencementioning

confidence: 99%

Information metasurfaces and intelligent metasurfaces

Xiao

et al. 2022

Photonics Insights

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Metamaterials and metasurfaces have inspired worldwide interest in the recent two decades due to their extraordinary performance in controlling material parameters and electromagnetic properties. However, most studies on metamaterials and metasurfaces are focused on manipulations of electromagnetic fields and waves, because of their analog natures. The concepts of digital coding and programmable metasurfaces proposed in 2014 have opened a new perspective to characterize and design metasurfaces in a digital way, and made it possible to control electromagnetic fields/waves and process digital information simultaneously, yielding the birth of a new direction of information metasurfaces. On the other hand, artificial intelligence (AI) has become more important in automatic designs of metasurfaces. In this review paper, we first show the intrinsic natures and advantages of information metasurfaces, including information operations, programmable and real-time control capabilities, and space-time-coding strategies. Then we introduce the recent advances in designing metasurfaces using AI technologies, and particularly discuss the close combinations of information metasurfaces and AI to generate intelligent metasurfaces. We present self-adaptively smart metasurfaces, AI-based intelligent imagers, microwave cameras, and programmable AI machines based on optical neural networks. Finally, we indicate the challenges, applications, and future directions of information and intelligent metasurfaces.

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Section: Meta-atom Design Using Artificial Intelligencementioning

confidence: 99%

Information metasurfaces and intelligent metasurfaces

Xiao

et al. 2022

Photonics Insights

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“…Existing efforts have pushed meta-optics into a new era from initial optical control and optical imaging to optical computing via performing metasurface-based mathematical operations on the optical field (including its amplitude, phase, polarization, and frequency, etc.) [ 85 , 124 , 138 , 139 , 140 , 141 , 142 ].…”

Section: Introductionmentioning

confidence: 99%

Advances in Meta-Optics and Metasurfaces: Fundamentals and Applications

Wan

Wang

et al. 2023

Nanomaterials

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Meta-optics based on metasurfaces that interact strongly with light has been an active area of research in recent years. The development of meta-optics has always been driven by human’s pursuits of the ultimate miniaturization of optical elements, on-demand design and control of light beams, and processing hidden modalities of light. Underpinned by meta-optical physics, meta-optical devices have produced potentially disruptive applications in light manipulation and ultra-light optics. Among them, optical metalens are most fundamental and prominent meta-devices, owing to their powerful abilities in advanced imaging and image processing, and their novel functionalities in light manipulation. This review focuses on recent advances in the fundamentals and applications of the field defined by excavating new optical physics and breaking the limitations of light manipulation. In addition, we have deeply explored the metalenses and metalens-based devices with novel functionalities, and their applications in computational imaging and image processing. We also provide an outlook on this active field in the end.

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“…For periodical metasurfaces or metagratings with the period larger than half of the wavelength, the incident plane wave from one direction will be scattered into multiple directions, and the power carried by the incident wave can be redistributed among a number of diffraction modes. Based on this concept, several metasurface devices with perfect anomalous reflection working at microwaves [36,37] and optical bands [38] have been developed. However, in these previous works, the functionality of metasurfaces is designed only for one incident angle and the response for other illuminations is actually not considered.…”

Section: Introductionmentioning

confidence: 99%

Coherent control of wave beams via unidirectional evanescent modes excitation

Zhong¹,

Wang²,

Tretyakov³

2023

Preprint

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Conventional coherent absorption occurs only when two incident beams exhibit mirror symmetry with respect to the absorbing surface, i.e., the two beams have the same incident angles, phases, and amplitudes. In this work, we propose a more general metasurface paradigm for coherent perfect absorption, with impinging waves from arbitrary asymmetric directions. By exploiting excitation of unidirectional evanescent waves, the output can be fixed at one reflection direction for any amplitude and phase of the control wave. We show theoretically and confirm experimentally that the relative amplitude of the reflected wave can be tuned continuously from zero to unity by changing the phase difference between the two beams, i.e. switching from coherent perfect absorption to full reflection. We hope that this work will open up promising possibilities for wave manipulation via evanescent waves engineering with applications in optical switches, one-side sensing, and radar cross section control.

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Perfect anomalous reflectors at optical frequencies

Cited by 51 publications

References 47 publications

Information metasurfaces and intelligent metasurfaces

Information metasurfaces and intelligent metasurfaces

Advances in Meta-Optics and Metasurfaces: Fundamentals and Applications

Coherent control of wave beams via unidirectional evanescent modes excitation

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