Wideband High-Reflection Chiral Dielectric Metasurface

Hu, Zhang; He, Nan; Sun, Yuwei; Jin, Yi; He, Sailing

doi:10.2528/pier21121903

Cited by 31 publications

(17 citation statements)

References 29 publications

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“…Tailoring the wavefront of electromagnetic waves at will has been continuously spurring tremendous interest of researchers ranging from microwave to optics domains, and controlling the amplitude and phase of circular polarized (CP) waves is particularly meaningful, attributed to the unparalleled characteristics and practical applications of CP waves. − Remarkably, chiral structures that universally appear in nature lacking any mirror symmetry plane are able to perform diverse responses for left-handed circular polarized (LCP) waves and right-handed circular polarized (RCP) waves and induce various exotic chiroptical phenomena, including optical activity, , circular dichroism, , and so on. − However, the chiral effects of natural materials are relatively weak because of the scale mismatch between electromagnetic waves and chiral molecules, which hinders their wide applications in engineering and also encourages researchers to explore the fire-new medium to enhance chiral effects. , Fortunately, the emergence of metasurfaces can effectively solve aforementioned difficulty of natural materials and make conspicuous progress in the design of chiral devices. , …”

Section: Introductionmentioning

confidence: 99%

“…11−13 However, the chiral effects of natural materials are relatively weak because of the scale mismatch between electromagnetic waves and chiral molecules, which hinders their wide applications in engineering and also encourages researchers to explore the firenew medium to enhance chiral effects. 14,15 Fortunately, the emergence of metasurfaces can effectively solve aforementioned difficulty of natural materials and make conspicuous progress in the design of chiral devices. 16,17 Metasurfaces, the artificial planar arrangements of various subwavelength resonators, possess exceptional capability of tailoring the amplitude, phase, and polarization of electromagnetic waves.…”

Section: ■ Introductionmentioning

confidence: 99%

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Single-Layer Achiral Metasurface with Independent Amplitude–Phase Control for Both Left-Handed and Right-Handed Circular Polarizations

Liu

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Amplitude–phase control for circular polarized (CP) waves is experiencing a research upsurge in electromagnetics owing to the kaleidoscopic electromagnetic responses and promising application prospects of circular polarizations, and chiral metasurfaces are more facile to achieve a series of intriguing chiral phenomena than natural materials. However, it is difficult for most existing chiral metasurfaces to independently tailor the amplitude and phase of left-handed circular polarized and right-handed circular polarized waves at the same frequency as they suffer the drawbacks of large thickness, multiple layers, and complex structure. Herein, an innovative strategy of single-layer achiral metasurfaces of thickness 0.13λ0 is proposed to independently and simultaneously manipulate the amplitude and phase of orthogonal CP waves. As a proof of concept, an amplitude and phase controlled dual-channel meta-hologram is designed to reconstruct diverse images with high fidelity under orthogonal CP illumination, and the simulated and experimental results collectively validate the availability of our methodology. Significantly, the meta-hologram is also applicable to full polarization states according to the decomposition of electromagnetic waves. The inspiring design of single-layer achiral metasurfaces provides a simple and effective approach to explore chiral effects, and they possess enormous application potential in multitudinous microwave devices.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Single-Layer Achiral Metasurface with Independent Amplitude–Phase Control for Both Left-Handed and Right-Handed Circular Polarizations

Liu

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…Thus far, we have witnessed fruitful metasurface applications including wave manipulation, anomalous reflection, invisibility cloak, special beam generation, and so on. [16,19,[23][24][25][26][27][28][29][30][31] An important characteristic of metasurfaces is associated with polarization sensitivity whose optical responses are different when the polarization of incident wave changes. [32] This important characteristic provides a new pathway for determining the polarization state with subtle design and a spectrum of works have validated the feasibility of metasurface-based polarization detection.…”

Section: Introductionmentioning

confidence: 99%

Arbitrary Polarization Readout with Dual‐Channel Neuro‐Metasurfaces

et al. 2022

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Polarization, as a vector nature of the electromagnetic wave, plays a fundamental role in optics. Determining the polarization state of light is required by many applications, spanning from remote sensing and material analysis to biology and microscopy. To achieve this goal, conventional methods necessitate cascading of multiple optical components and consequential measurements to estimate the Stokes parameters, rendering the entire optical system bulky, complex, and sensitive. Here a brand-new strategy is introduced for direct polarization readout based on dual-channel neuro-metasurfaces. Neuro-metasurfaces can independently manipulate two orthogonal linearly-polarized waves that can synthesize arbitrary polarization waves with a linear combination. By judiciously designing the output focus points, a unique polarization atlas is created that allows one-to-one correspondence from intensity ratio to polarization state. To implement this, polarization-sensitive metasurfaces are designed and the spatial layout is optimized using a diffractive neural network. The feasibility of this strategy is validated by numerical simulation and microwave experiments. These results pave a new avenue in realizing integrated and multifunctional detectors and demonstrate the potential of neuro-metasurfaces as an add-on for discomposing and composing spatial basis.

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“…Chiral media can be classified into natural chiral medium, 14 artificial chiral structures, [15][16][17][18] and effective chiral medium. 19,20 Chiral structures with gain, instead of loss, are called active chiral structures.…”

Section: Introductionmentioning

confidence: 99%

“…4 Wo et al investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via evanescent near fields by using numerical and analytical methods. 12 Nevertheless, further studies on the complex mechanism of optical forces on inhomogeneous chiral structures are necessary.Chiral media can be classified into natural chiral medium, 14 artificial chiral structures, [15][16][17][18] and effective chiral medium. 19,20 Chiral structures with gain, instead of loss, are called active chiral structures.…”

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confidence: 99%

Radiation pressure on inhomogeneous active chiral structures with propagation matrix

Wang²,

Zhang

et al. 2022

Int J Numerical Modelling

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The propagation matrix method and the Maxwell stress tensor are developed to calculate radiation pressure on an inhomogeneous active chiral structure. Based on boundary conditions, a 4 Â 4 propagation matrix connecting two forward and two backward plane waves in adjacent chiral media is derived. This propagation matrix method allows us to access the net, co-and cross-polarized radiation pressure, which are expressed by coand cross-polarized reflection and transmission coefficients, exerted on magnetoelectric coupling inhomogeneous chiral slabs via the derivation of the Maxwell stress tensor for arbitrary polarized plane waves incidence. The accuracies of the methods are examined using the finite difference time domain method and the Lorentz force densities. The radiation pressure on a homogeneous or inhomogeneous active chiral slab affected by the angle of incidence, thickness, chirality parameter, and polarization states of incident waves are investigated. This work is believed to provide insights for detecting chirality parameters of inhomogeneous materials by optical forces.chiral, Maxwell stress tensor, optical forces, propagation matrix method, radiation | INTRODUCTIONRecently, optical pulling forces have stimulated intense interests in the fields of physics, mechanics, biology, and chemistry. [1][2][3][4][5][6][7][8][9][10][11][12][13] The pulling forces can be realized by using tractor beams or on various medium structures. Some effort has been devoted to studying negative optical forces on chiral structures. [4][5][6][7][8][9][10][11][12] Horai et al. formulated an optical force under electronic resonance to enhance the optical force and realized the separation of nanometer-sized chiral molecules. 4 Wo et al. investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via evanescent near fields by using numerical and analytical methods. 12 Nevertheless, further studies on the complex mechanism of optical forces on inhomogeneous chiral structures are necessary.Chiral media can be classified into natural chiral medium, 14 artificial chiral structures, [15][16][17][18] and effective chiral medium. 19,20 Chiral structures with gain, instead of loss, are called active chiral structures. Though the majority of chiral media are passive, green fluorescent proteins, 14 active chiral metamaterials, 15 and chiral functional polymers, 16 and so forth, might be active chiral media. The Lorentz force density 21 and the Maxwell stress tensor, 22

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Wideband High-Reflection Chiral Dielectric Metasurface

Cited by 31 publications

References 29 publications

Single-Layer Achiral Metasurface with Independent Amplitude–Phase Control for Both Left-Handed and Right-Handed Circular Polarizations

Single-Layer Achiral Metasurface with Independent Amplitude–Phase Control for Both Left-Handed and Right-Handed Circular Polarizations

Arbitrary Polarization Readout with Dual‐Channel Neuro‐Metasurfaces

Radiation pressure on inhomogeneous active chiral structures with propagation matrix

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