Near-infrared chirality of plasmonic metasurfaces with gold rectangular holes

Wu, Biyuan; Wang, Mingjun; Sun, Yasong; Wu, Feng; Shi, Zhangxing; Wu, Xiaohu

doi:10.1007/s42114-022-00513-3

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…As each meta-atom is rotated, the entire arrangement loses its mirror symmetry in xz-and yz-planes, making the metasurface chiral as long as the rotation angle for the square lattice is not a multiple of π/4 (45°), where the xz-and yzmirror symmetry is restored when the coordinate system is rotated with the same angle. An intuitive graphical illustration of this behavior can be found in Figure S1 and in ref 54, where the case of a hexagonal lattice is also discussed. We investigate experimentally and numerically a series of metasurfaces with rotation angles varying from −45°to +45°i n 5°steps.…”

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confidence: 88%

“…To date only theoretical work exists on rotation induced chirality by utilizing achiral plasmonic gold dimers and rods 52,53 or by using achiral plasmonic hole arrays in gold films. 54 We generalize this concept for dielectric metasurfaces, which may be more suitable for chiral applications, such as biosensing, since plasmonic nanostructures can suffer from intrinsic losses. 8 We follow the rotation angle dependent evolution of our resonances with circularly and linearly polarized illumination and investigate the effect of the geometric asymmetry, the gap sizes between our structures, and the chiral near-fields on the chiroptical response.…”

mentioning

confidence: 99%

“…Chirality is created by rotating the meta-atoms through an angle of rotation, making their arrangement in a metasurface chiral. − Although the proposed design is geometrically simple, the measured and simulated far-field response is stronger, or at least comparable to those shown by many more complex designs. ,, While rotated dielectric bars are very prominent in the field of beam shaping and focusing by utilizing the Pancharatnam-Berry phase, their chiral response is usually overlooked. To date only theoretical work exists on rotation induced chirality by utilizing achiral plasmonic gold dimers and rods , or by using achiral plasmonic hole arrays in gold films . We generalize this concept for dielectric metasurfaces, which may be more suitable for chiral applications, such as biosensing, since plasmonic nanostructures can suffer from intrinsic losses .…”

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confidence: 99%

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Two-Dimensional Chiral Metasurfaces Obtained by Geometrically Simple Meta-atom Rotations

Gryb,

Wendisch,

Aigner

et al. 2023

Nano Lett.

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Two-dimensional chiral metasurfaces seem to contradict Lord Kelvin’s geometric definition of chirality since they can be made to coincide by performing rotational operations. Nevertheless, most planar chiral metasurface designs often use complex meta-atom shapes to create flat versions of three-dimensional helices, although the visual appearance does not improve their chiroptical response but complicates their optimization and fabrication due to the resulting large parameter space. Here we present one of the geometrically simplest two-dimensional chiral metasurface platforms consisting of achiral dielectric rods arranged in a square lattice. Chirality is created by rotating the individual meta-atoms, making their arrangement chiral and leading to chiroptical responses that are stronger or comparable to more complex designs. We show that resonances depending on the arrangement are robust against geometric variations and behave similarly in experiments and simulations. Finally, we explain the origin of chirality and behavior of our platform by simple considerations of the geometric asymmetry and gap size.

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confidence: 88%

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confidence: 99%

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confidence: 99%

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Two-Dimensional Chiral Metasurfaces Obtained by Geometrically Simple Meta-atom Rotations

Gryb,

Wendisch,

Aigner

et al. 2023

Nano Lett.

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show abstract

“…Unfortunately, due to the extreme dependence of the EM waves on both the shape, size, and thickness of the resonant structures, the polarization and angle sensitivity and the narrow working band (usually only a few frequency points) have restricted badly the practical application of metasurface at present [34].…”

Section: Introductionmentioning

confidence: 99%

Impedance mismatch derived coded absorbing materials: for ultra-broadband anti-reflection and scattering field tailored on demand

Chen

Duan

Liu

et al. 2023

Preprint

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The inability of existing electromagnetic wave absorbing materials (EAMs) to manipulate electromagnetic waves in multiple dimensions leads to the failure to satisfy the demands placed on electromagnetic (EM) defense technology by the current complex EM environment. To break this dilemma, this study focuses on the impedance properties of EAMs, conferring additional ability to disperse and deflect reflected waves by encoding EAMs with opposite phase responses in different impedance mismatch modes. Due to the synergy of both absorption and scattering mechanisms, the developed scattering metasurface absorber exhibits excellent anti-reflection performance, with reflectivity below 0.1 in the 7.8-16.7 GHz at 2 mm thickness. Furthermore, a genetic algorithm is employed to tailor the desired scattering field to meet the stealth requirements of specific environments, allowing for the directional transmission of EM energy in the one-dimensional or homogeneous distribution in the three-dimensional. The proposed scattering metasurface absorber constructed by coded EAMs exhibited excellent anti-reflection properties and environmental stealth adaptability, opening up new possibilities for the development of advanced EM defense technology.

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“…So far, the generation of superchiral fields has mainly relied on chiral plasmonic resonators or chiral 3D architectures. − In these approaches, the difficulty lies in the external control of the sign of the chirality density, which is fixed by the shape of the resonators. Recently, other interesting approaches using achiral plasmonic ,,− or dielectric ,− resonators featuring chiral near-fields yielding some signatures of CD have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Achiral Magnetic Photonic Antenna as a Tunable Nanosource of Chiral Light

Cui,

Yang,

Reynier

et al. 2023

ACS Photonics

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Sensitivity to molecular chirality is crucial for many fields, from biology and chemistry to the pharmaceutical industry. By generating superchiral light, nanophotonics has brought innovative solutions to reduce the detection volume and increase sensitivity at the cost of a nonselectivity of light chirality or a strong contribution to the background. Here, we theoretically propose a simple achiral plasmonic resonator based on a rectangular nanoslit in a thin metallic layer behaving as a magnetic dipole to generate a tunable nanosource of purely chiral light working from the UV to the infrared. This nanosource is free of any background, and the sign of its chirality is externally tunable in wavelength and polarization. These unique properties, resulting from the coupling between the incident wave and the magnetic dipolar character of our nanoantenna, coupled with a method of Fluorescent Detected Circular Dichroism (FDCD), shown to be 2 orders of magnitude more sensitive than classical circular dichroism measurements, thus provide a platform with deep subwavelength detection volumes for chiral molecules and a roadmap for optimizing the signal-to-noise ratios in circular dichroism measurements to reach single-molecule sensitivity.

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Near-infrared chirality of plasmonic metasurfaces with gold rectangular holes

Cited by 20 publications

References 43 publications

Two-Dimensional Chiral Metasurfaces Obtained by Geometrically Simple Meta-atom Rotations

Two-Dimensional Chiral Metasurfaces Obtained by Geometrically Simple Meta-atom Rotations

Impedance mismatch derived coded absorbing materials: for ultra-broadband anti-reflection and scattering field tailored on demand

Achiral Magnetic Photonic Antenna as a Tunable Nanosource of Chiral Light

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