Strong circular dichroism triggered by near-field perturbation

Wu, Biyuan; Wang, Mingjun; Yu, Peng; Wu, Feng; Wu, Xiaohu

doi:10.1016/j.optmat.2021.111255

Cited by 8 publications

(18 citation statements)

References 36 publications

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“…Recently, numerous chiral metasurfaces assisted by BICs lead to quasi‐BICs have been demonstrated in the literature. [ 94–104 ]…”

Section: Chirality Empowered By Bound States In the Continuum (Bics)mentioning

confidence: 99%

“…demonstrated a honeycomb‐shaped gold hole structure to design a plasmonic metasurface to generate strong circular dichroism triggered by near‐field perturbation without breaking the rotational and mirror symmetry ( Figure A). [ 94 ] Meanwhile, a rectangular hole structure is also demonstrated to prove the generation of strong chirality without breaking geometric symmetry. Most recently, Tang et al.…”

Section: Chirality Empowered By Bound States In the Continuum (Bics)mentioning

confidence: 99%

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Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

Khaliq

Nauman

Lee

2023

Advanced Optical Materials

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Over the years, researchers have been exploring ways to artificially design chiral structures and materials, namely metamaterials and metasurfaces. They exhibit unique optical properties that can be used for various applications. However, metasurfaces comprise symmetry‐breaking structures that provide a more convenient solution for planar chiral optics regardless of whether they are plasmonic or dielectric. In general, plasmonic chiral metasurfaces are more suitable for applications requiring a high confinement level and substantial optical near‐field enhancement. In contrast, dielectric chiral metasurfaces are ideal for wide operating wavelength ranges and low losses. This review summarizes the recent progress on plasmonic and dielectric chiral metasurfaces. It includes the fundamental concepts, design strategies, and their implementation for applications in holographic displays, imaging and sensing, and detection. Moreover, an overview of chiral metasurfaces to generate the nonlinear effects, hosting bound states in the continuum, and the significant role of machine‐learning‐based design approaches are also discussed. Finally, some future developments are highlighted where chiral metasurfaces are expected to play a vital role.

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“…Recently, numerous chiral metasurfaces assisted by BICs lead to quasi‐BICs have been demonstrated in the literature. [ 94–104 ]…”

Section: Chirality Empowered By Bound States In the Continuum (Bics)mentioning

confidence: 99%

Section: Chirality Empowered By Bound States In the Continuum (Bics)mentioning

confidence: 99%

Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

Khaliq

Nauman

Lee

2023

Advanced Optical Materials

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“…resonances (SLRs). [38][39][40] One representative example is based on a pair of gold split-ring resonators (SRRs) on a gold mirror. [38] This configuration allows for spin-selective absorption due to the excitation of chiral quasi-BIC resonances.…”

Section: Introductionmentioning

confidence: 99%

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Tang

Liang

Yao

et al. 2023

Laser & Photonics Reviews

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Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q‐factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from a fundamental trade‐off between Q‐factor and circular dichroism (CD), presenting a significant hurdle that severely limits the independent control between CD and Q‐factors. Here, 3D plasmonic metasurfaces are numerically demonstrated that overcome the trade‐off and offer high‐Q quasi‐BIC resonances (Q ≈ 938) with strong CD (≈0.67) in the mid‐infrared. These metasurfaces are made of integrated‐resonance units consisting of a twisted vertical split‐ring resonator (VSRR) and a wall. Importantly, this dissimilar dimer configuration unlocks a new degree of freedom to decouple the Q‐factor and CD, that is, the Q‐factor and CD can be relatively independently manipulated by the height of the wall and the twisted angle of the VSRR, respectively. These results provide novel paradigms to manipulate advanced chiroptical responses, with various applications that require strong CD with enhanced light–matter interaction.

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“…Circular dichroism (CD) is defined as the difference in the absorption between left-hand circular polarization (LCP) and right-hand circular polarization (RCP); CD is an important parameter when measuring spin thermal radiation [ 21 , 22 ]. At present, many approaches have been proposed to improve CD [ 23 , 24 ]. It is possible to break mirror symmetry using an applied magnetic field (due to the spin-orbit interaction of electrons) resulting in spin thermal radiation [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Dyakov et al proposed a photonic crystal slab waveguide with chiral morphology that can excite spin thermal radiation without an external magnetic field [ 44 ]. Kong et al proposed a novel chiral metamaterial structure with Γ-shaped aligned nanocrystals to achieve significant CD [ 24 ]. To date, many two-dimensional (2D) or three-dimensional (3D) chiral microstructures have been designed that enhance spin thermal radiation significantly [ 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Metasurfaces Assisted Twisted α-MoO3 for Spinning Thermal Radiation

Sun

Zhang

et al. 2022

Micromachines

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Spinning thermal radiation has demonstrated applications in engineering, such as radiation detection and biosensing. In this paper, we propose a new spin thermal radiation emitter composed of the twisted bilayer α-MoO3 metasurface; in our study, it provided more degrees of freedom to control circular dichroism by artificially modifying the filling factor of the metasurface. In addition, circular dichroism was significantly enhanced by introducing a new degree of freedom (filling factor), with a value that could reach 0.9. Strong-spin thermal radiation resulted from the polarization conversion of circularly polarized waves using the α-MoO3 metasurface and selective transmission of linearly polarized waves by the substrate. This allowed for extra flexible control of spinning thermal radiation and significantly enhanced circular dichroism, which promises applications in biosensing and radiation detection. As a result of their unique properties, hyperbolic materials have applications not only in spin thermal radiation, but also in areas such as near-field thermal radiation. In this study, hyperbolic materials were combined with metasurfaces to offer a new idea regarding modulating near-field radiative heat transfer.

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Strong circular dichroism triggered by near-field perturbation

Cited by 8 publications

References 36 publications

Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Metasurfaces Assisted Twisted α-MoO3 for Spinning Thermal Radiation

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