Coherent perfect absorption in chiral metamaterials

Ye, Yuqian; Hay, Darrick; Shi, Zhimin

doi:10.1364/ol.41.003359

Cited by 28 publications

(13 citation statements)

References 21 publications

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“…For instance, a chiral slab can have separateŜ matrices for clockwise and counterclockwise polarization states, with the CPA conditions for clockwise and counterclockwise modes satisfied at different frequencies [95]. The CPA eigenmodes then consist of input waves of the same circular polarization but different intensities, in contrast to the non-chiral case, in which CPA eigenmodes consist of two beams of equal intensities.…”

Section: Polarization Effectsmentioning

confidence: 99%

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Coherent perfect absorbers: linear control of light with light

et al. 2017

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Absorption of electromagnetic energy by a material is a phenomenon that underlies many applied problems, including molecular sensing, photocurrent generation and photodetection. Commonly, the incident energy is delivered to the system through a single channel, for example by a plane wave incident on one side of an absorber. However, absorption can be made much more efficient by exploiting wave interference. A coherent perfect absorber is a system in which complete absorption of electromagnetic radiation is achieved by controlling the interference of multiple incident waves. Here, we review recent advances in the design and applications of such devices. We present the theoretical principles underlying the phenomenon of coherent perfect absorption and give an overview of the photonic structures in which it can be realized, including planar and guidedmode structures, graphene-based systems, parity-and time-symmetric structures, 3D structures and quantum-mechanical systems. We then discuss possible applications of coherent perfect absorption in nanophotonics and, finally, we survey the perspectives for the future of this field.

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Section: Polarization Effectsmentioning

confidence: 99%

“…The CPA eigenmodes then consist of input waves of the same circular polarization but different intensities, in contrast to the non-chiral case, in which CPA eigenmodes consist of two beams of equal intensities. Chiral CPA structures may have applications in coherent polarization control [95,96].…”

Section: Polarization Effectsmentioning

confidence: 99%

Coherent perfect absorbers: linear control of light with light

et al. 2017

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“…In comparison, coherent control method provides an excellent way to simplify the design, and offers the ability in achieving active control of the chiral response at the same time. [ 22–24 ] Coherent control refers to a controlling manner that commonly requires two coherent beams with the same amplitude illuminating on the sample from both sides symmetrically. [ 25,26 ] Thus, the output beam on each side is the interference result of the reflected beam from the same side incidence and the transmitted beam from the other side incidence.…”

Section: Introductionmentioning

confidence: 99%

Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

Zhang

et al. 2020

Advanced Optical Materials

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Recently, chiral metasurfaces have drawn enormous attentions due to their flexibility in realizing nearly arbitrary chiral effect with designable strength. One intriguing direction in this field is chiral‐selective absorption. However, previous studies mostly require multilayer design and meanwhile often work in a passive way. Here, for the first time to the authors’ knowledge, a chiral‐selective metasurface absorber is experimentally demonstrated with a single‐layer free‐standing metasurface using coherent control method, where the strength of the chiral‐selective behavior can be actively tuned with a 100% modulation depth by simply changing the phase difference between the two coherent inputs. Specifically, under coherent symmetric illumination, near unity absorption is achieved for one circularly polarized incidence, while high‐efficiency cross‐polarization conversion is obtained for the other circularly polarized incidence. Such chiral‐selective absorption property is quite suitable for achieving coherent chiral‐selective wavefront control for the unabsorbed circularly polarized incidence. Three coherent chiral metagratings are designed and experimentally characterized by further employing Pancharatnam–Berry phase method and multiplexed method, where very good performances are achieved. The proposed approach on coherent control can enrich the functionalities and also improve the performances of the conventional single‐layer metasurfaces, which can find extending applications in various practical cases.

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“…Coherent light-matter interaction in ultrathin metamaterials has been demonstrated to dynamically modulate intensity, polarization and propagation direction of light22232425262728293031323334353637. Coherent control of metamaterials could be accomplished in various schemes, for instance, in the polarization standing wave33, from linear to circular polarization illumination3435, from conventional metamaterials to gradient metasurfaces30 and from plasmonic to all-dielectric metasurfaces36.…”

mentioning

confidence: 99%

“…Coherent control of metamaterials could be accomplished in various schemes, for instance, in the polarization standing wave33, from linear to circular polarization illumination3435, from conventional metamaterials to gradient metasurfaces30 and from plasmonic to all-dielectric metasurfaces36. The gradient metasurface with a 2π transverse phase variation usually exhibits an anomalous refraction phenomenon.…”

mentioning

confidence: 99%

Coherent control of double deflected anomalous modes in ultrathin trapezoid-shaped slit metasurface

Zhu

Liu

Wang

et al. 2016

Sci Rep

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Coherent light-matter interaction in ultrathin metamaterials has been demonstrated to dynamically modulate intensity, polarization and propagation direction of light. The gradient metasurface with a transverse phase variation usually exhibits an anomalous refracted beam of light dictated by so-called generalized Snell’s law. However, less attention has been paid to coherent control of the metasurface with multiple anomalous refracted beams. Here we propose an ultrathin gradient metasurface with single trapezoid-shaped slot antenna as its building block that allows one normal and two deflected transmitted beams. It is numerically demonstrated that such metasurface with multiple scattering modes can be coherently controlled to modulate output intensities by changing the relative phase difference between two counterpropagating coherent beams. Each mode can be coherently switched on/off and two deflected anomalous beams can be synchronously dictated by the phase difference. The coherent control effect in the trapezoid-shaped slit metasurface will offer a promising opportunity for multichannel signals modulation, multichannel sensing and wave front shaping.

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Coherent perfect absorption in chiral metamaterials

Cited by 28 publications

References 21 publications

Coherent perfect absorbers: linear control of light with light

Coherent perfect absorbers: linear control of light with light

Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

Coherent control of double deflected anomalous modes in ultrathin trapezoid-shaped slit metasurface

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