Dual‐Functional Metasurface toward Giant Linear and Circular Dichroism

Huang, Yijia; Xie, Xin; Pu, Mingbo; Guo, Yinghui; Xu, M.; Ma, Xiaoliang; Li, Xiong; Luo, Xiangang

doi:10.1002/adom.201902061

Cited by 33 publications

(12 citation statements)

References 38 publications

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“…[15,16] Besides, efficient generation of circularly polarized EM waves also plays an important role in modern optics and photonics for imaging and holographic applications. [17][18][19] For previously reported works, [20][21][22][23][24][25] efficient chiral absorption can be realized in a wide range of frequencies from microwave to optics by taking advantage of intrinsic or extrinsic chirality. In fact, although current chiral metasurfaces have shown impressive performance in terms of working efficiency and structural compactness, how to integrate more functionalities in one device is still quite challenging.…”

Section: Doi: 101002/adom202001663mentioning

confidence: 99%

Single‐Layered Reflective Metasurface Achieving Simultaneous Spin‐Selective Perfect Absorption and Efficient Wavefront Manipulation

Huang

Xiao

Xie

et al. 2020

Advanced Optical Materials

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As the 2D counterpart of metamaterials, metasurfaces have drawn wide attentions in recent years due to their unique electromagnetic (EM) properties and subwavelength footprints. Although great efforts have been made in metasurface‐based full vectorial manipulation of EM waves, the realization of multifunctional devices with high compactness is still challenging. Here, by employing the mutual coupling between the meta‐atoms to induce spin‐selective magnetic resonance, a generalized design principle based on single‐layered metasurface is proposed that can achieve giant chiral absorption with average circular dichroism larger than 80%. In addition, arbitrary wavefront manipulation for reflected waves can also be realized with operation efficiency larger than 88%. As a proof of concept, three kinds of chiral devices including beam deflector, vortex beam generator, and meta‐hologram are numerically investigated in infrared region with high performance. It is believed that these multifunctional devices with simple geometry have great potentials in the field of chiral imaging, chiroptical spectroscopy, and EM communication.

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Section: Doi: 101002/adom202001663mentioning

confidence: 99%

Single‐Layered Reflective Metasurface Achieving Simultaneous Spin‐Selective Perfect Absorption and Efficient Wavefront Manipulation

Huang

Xiao

Xie

et al. 2020

Advanced Optical Materials

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“…A set of such polarization-converting meta-atoms (PCMs) imparting distinct phase delays can be used to realize the integration of wave plate and other optical components such as lens, beam splitter, and parabolic reflector. The unprecedented polarizing device that can simultaneously empower distinct polarization modulation functionalities including linear and circular dichroism on a single platform has also become feasible, further revealing its fascinating ability in polarization control. , …”

Section: Introductionmentioning

confidence: 99%

Efficient All-Dielectric Diatomic Metasurface for Linear Polarization Generation and 1-Bit Phase Control

Gao

Zhou

Yue

et al. 2021

ACS Appl. Mater. Interfaces

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Optical metasurface has exhibited unprecedented capabilities in the regulation of light properties at a subwavelength scale. In particular, a multifunctional polarization metasurface making use of light polarization to integrate distinct functionalities on a single platform can be greatly helpful in the miniaturization of photonic systems and has become a hot research topic in recent years. Here, we propose and demonstrate an efficient all-dielectric diatomic metasurface, the unit cell of which is composed of a pair of a-Si:H-based nanodisks and nanopillars that play the roles as polarization-maintaining and polarizationconverting meta-atoms, respectively. Through rigorous theoretical analyses and numerical simulations, we show that a properly designed diatomic metasurface can work as a nanoscale linear polarizer for generating linearly polarized light with a controllable polarization angle and superior performances including a maximum transmission efficiency of 96.2% and an extinction ratio of 32.8 dB at an operation wavelength of 690 nm. Three metasurface samples are fabricated and experimentally characterized to verify our claims and their potential applications. Furthermore, unlike previously reported dielectric diatomic metasurfaces which merely manipulate the polarization state, the proposed diatomic metasurface can be easily modified to empower 1-bit phase modulation without altering the polarization angle and sacrificing the transmission efficiency. This salient feature further leads to the demonstration of a metasurface beam splitter that can be equivalently seen as the integration of a nonpolarizing beam splitter and a linear polarizer, which has never been reported before. We envision that various metadevices equipping with distinct wavefront shaping functionalities can be realized by further optimizing the diatomic metasurface to achieve an entire 2π phase control.

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“…To further increase the degrees of freedom for EM wave manipulations, metamirrors (also known as reflective metasurfaces), a kind of artificial surfaces composed of periodically aligned subwavelength meta-atoms, were introduced recently. − Compared with conventional mirrors with isotropic performance, the EM responses of metamirrors can be designed on demand by introducing strong localized light–matter interactions at the surface. , So far, many exotic metamirror-based applications such as light bending, , focusing, , polarization control, − and chiral absorption − were realized and the respective devices exhibited a higher performance and more compactness compared with their traditional counterparts. Among them, metamirrors for chiral absorption (also known as chiral mirrors) that reflect one circularly polarized light (CPL) while absorbing the other with the opposite handedness are of great importance in the fields of chiral spectroscopy and imaging since chirality is an intrinsic feature that has been widely found in DNA, proteins, crystals, and some species.…”

Section: Introductionmentioning

confidence: 99%

Multistate Nonvolatile Metamirrors with Tunable Optical Chirality

Huang

Xiao

Xie

et al. 2021

ACS Appl. Mater. Interfaces

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Compared with conventional mirrors that behave as isotropic electromagnetic (EM) reflectors, metamirrors composed of periodically aligned artificial meta-atoms exhibit increased degrees of freedom for EM manipulations. However, the functionality of most metamirrors is fixed by design, and how to achieve active EM control is still elusive. Here, we propose a multistate metamirror based on the nonvolatile phase change material Ge2Sb2Te5 (GST) with four distinct functionalities that can be realized in the infrared region by exploiting the temperature-activated phase transition. When varying the crystallinity of GST, the metamirror has the capability to perform as a right-handed circular polarization chiral mirror, a narrowband achiral mirror, a left-handed circular polarization chiral mirror, or a broadband achiral mirror, respectively. The inner physics is further explained by the construction or cancellation of extrinsic two-dimensional chirality. As a proof of concept, experimental verification is carried out and the measured results agree well with their simulated counterparts. Such a multifunctional tunable metamirror could address a wide range of applications from sensing and spectroscopy to analytical chemistry and imaging.

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Dual‐Functional Metasurface toward Giant Linear and Circular Dichroism

Cited by 33 publications

References 38 publications

Single‐Layered Reflective Metasurface Achieving Simultaneous Spin‐Selective Perfect Absorption and Efficient Wavefront Manipulation

Single‐Layered Reflective Metasurface Achieving Simultaneous Spin‐Selective Perfect Absorption and Efficient Wavefront Manipulation

Efficient All-Dielectric Diatomic Metasurface for Linear Polarization Generation and 1-Bit Phase Control

Multistate Nonvolatile Metamirrors with Tunable Optical Chirality

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