Extremely high contrast asymmetric transmission with linear tunability in chiral metamaterials

Li, Xuefeng; Feng, Rui; Ding, Wei

doi:10.1088/1361-6463/aab0c2

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…Fortunately, the emergence of metamaterial provides an appealing alternative to control electromagnetic wave manipulations properties [12][13][14][15][16][17], and the discovery of the AT phenomenon based on metamaterial was first experimentally demonstrated in the microwave region by Fedotov et al in 2006 [18]. Since then, various AT devices based on artificial structures have been proposed which use photonic crystals [19,20], subwavelength asymmetric gratings [21][22][23][24], chiral metamaterials [25][26][27] and metasurfaces [28][29][30], and the operation wavelengths have been covered from microwave to visible light [31][32][33]. These devices show promise to some degree; however, those using chiral metamaterials are usually complex and incorporate multilayer structures, whereas those using subwavelength asymmetric gratings are polarization sensitive.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

et al. 2021

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Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.

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Section: Introductionmentioning

confidence: 99%

High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

et al. 2021

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“…It requires the symmetry in the z direction to be broken, and chiral structures are commonly utilized to achieve this goal [26,28,36], which is the basis of our design. It should be stressed that the AT phenomenon here are reciprocal in physics.…”

Section: Methodsmentioning

confidence: 99%

Asymmetric Transmission in a Mie-Based Dielectric Metamaterial with Fano Resonance

Wang

Zhou

2019

Materials

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Chiral metamaterials with asymmetric transmission can be applied as polarization-controlled devices. Here, a Mie-based dielectric metamaterial with a spacer exhibiting asymmetric transmission of linearly polarized waves at microwave frequencies was designed and demonstrated numerically. The unidirectional characteristic is attributed to the chirality of the metamolecule and the mutual excitation of the Mie resonances. Field distributions are simulated to investigate the underlying physical mechanism. Fano-type resonances emerge near the Mie resonances of the constituents and come from the destructive interference inside the structure. The near-field coupling further contributes to the asymmetric transmission. The influences of the lattice constant and the spacer thickness on the asymmetric characteristics were also analyzed by parameter sweeps. The proposed Mie-based metamaterial is of a simple structure, and it has the potential for applications in dielectric metadevices, such as high-performance polarization rotators.

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“…In addition, the use of multilayer metallic configurations prevents obtaining a highcontrast AT ratio. Although optical devices with an AT characteristic can be realized using plasmonic metamaterials as another approach [5][6][7], they usually exhibit low transmission amplitudes due to optical losses in the multilayer designs [14][15][16][17][18][19][20]. Moreover, the realization of a double grating design separated by a thin dielectric is a challenging task from the fabrication perspective [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Diode like high-contrast asymmetric transmission of linearly polarized waves based on plasmon-tunneling effect coupling to electromagnetic radiation modes

Khalichi¹,

Ghobadi²,

Osgouei³

et al. 2021

J. Phys. D: Appl. Phys.

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We present a narrow-band optical diode with a high-contrast forward-to-backward ratio at the near-infrared region. The design has a forward transmission of approximately 88%, and a backward one of less than 3%, yielding a contrast ratio of greater than 14.5 dB at a wavelength of 1550 nm. The structure is composed of a one-dimensional diffraction grating on top of a dielectric slab waveguide, both of which are made of silicon nitride (Si 3 N 4 ), and all together are placed over a silver (Ag) thin film embedded on a dielectric substrate. Utilizing a dielectric-based diffraction grating waveguide on a thin silver layer leads to the simultaneous excitation of two surface plasmon modes known as long-and short-range surface plasmon polaritons (SPPs) at both interfaces of the metallic layer. The plasmon-tunneling effect, which is the result of the coupling of SPPs excited at the upper interface of the metallic layer to the radiation modes, provides a high asymmetric transmission (AT) property. The spectral response of the proposed high-contrast AT device is verified using both rigorous coupled-wave analysis as an analytical approach and finite difference time domain as a numerical one.

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Extremely high contrast asymmetric transmission with linear tunability in chiral metamaterials

Cited by 15 publications

References 33 publications

High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

Asymmetric Transmission in a Mie-Based Dielectric Metamaterial with Fano Resonance

Diode like high-contrast asymmetric transmission of linearly polarized waves based on plasmon-tunneling effect coupling to electromagnetic radiation modes

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