Ultra-wideband, wide angle, asymmetric transmission based chiral metasurface for C and X band applications

Bokhari, Syed Hussain Ali; Cheema, Hammad M.

doi:10.1038/s41598-021-91126-1

Cited by 15 publications

(3 citation statements)

References 50 publications

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“…It is desirable to have high angle robustness [28,29] for tunable electro-optical applications. Very high transmission over a wide range of incident angles has been demonstrated in various types of metasurfaces with promising applications, such as optical filters [30][31][32]. The benefit of having a wide-angle characteristic is that it does not limit their potential in situations when the incident wave has an arbitrary angle [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Lattice constant and polarization-independent high transmission in tellurium-based dielectric metasurfaces

Sadasivan,

Krishnan,

Dontabhaktuni

2023

J. Opt.

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High refractive index dielectric metasurfaces give rise to unprecedented control on light manipulation such as control of phase, polarization and amplitude giving rise to interesting properties such as directional beam steering, polarization detectors, sensors, etc. Dielectric metasurfaces of sub-wavelength dimensions have tremendous applications in the field of optics such as negative refractive index, cloaking, perfect absorbers and reflectors. Study of light matter interactions in such materials have gained impetus due to formation of novel states like anapoles and transparent states obtained by interference between resonant electric, magnetic and higher order modes. In this article, we investigate light-matter interaction of array of periodic dielectric metasurfaces made from high refractive index Tellurium in cubic geometries and study its electromagnetic response as a function of lattice constant, angle of incidence and angle of polarization. More specifically, we observed a non-resonant transparent state at 60.69 THz, which is independent of lattice-constant and polarization of the input radiation. Moreover, this state shows a high transmission for a broad range of incident angles with potential applications as optical filters. and depends on the incident polarization, thus acting as a perfect polarization detector. Detailed investigations of scattering parameters, spatial distribution of electric and magnetic fields in the near- and far-field regions and detailed multipole analysis are carried out to analyze the electromagnetic response of the metasurface.

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Section: Introductionmentioning

confidence: 99%

Lattice constant and polarization-independent high transmission in tellurium-based dielectric metasurfaces

Sadasivan,

Krishnan,

Dontabhaktuni

2023

J. Opt.

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“…The underlying theory is based on the Generalized Snell's Law (GSL) proposed by Yu [1] et al in 2011, which states that when a beam passes through the interface of two media, the beam will produce phase mutation at the interface. If the phase is reasonably designed and arranged at the interface, many strange physical phenomena can be realized, such as abnormal refraction [2][3][4], beam focusing [5,6], self-acceleration [7], vortex [8][9][10], asymmetric transmission [11][12][13], etc. Once proposed in the field of optics, metasurfaces were rapidly applied to the field of acoustic/elastic files.…”

Section: Introductionmentioning

confidence: 99%

A broadband tunable asymmetric transmission structure design

Wang¹,

Xuan²,

Qi³

et al. 2022

Phys. Scr.

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In this paper, we design a tunable asymmetric transmission structure consisting of a one-dimensional phononic crystal metastructure and a simple mass oscillator metasurface. By reasonably adjusting the width of the supercell in the metasurface, transmission control of the flexural wave can be achieved. According to the generalized Snell's law, anomalous refraction occurs when the flexural wave is obliquely incident, while total reflection will occur when the flexural wave is vertically incident. The one-dimensional phononic crystal metastructure can be used to deflect the perpendicularly incident flexural wave. In combination with the metasurface, the asymmetric transmission of flexural waves over a quite wide frequency range can be achieved. The designed asymmetric transmission structure has both tunability and broadband capability. Adjusting the distance of the mass oscillators in the metastructure and the phase distribution of the metasurface can realize the modulation of refraction angles, while increasing or decreasing the number of mass oscillators can further expand the operating frequency domain of the tunable asymmetric transmission structure. Numerical results show that the proposed structure can achieve asymmetric transmission of flexural waves in the frequency domain of 13-25 kHz or even wider.

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“…structures with asymmetric configurations based on passive linear materials were proposed for AOT. Such structures include heterojunction photonic crystals [11][12][13][14], asymmetric dielectric or plasmonic metal gratings [15][16][17][18][19][20][21][22], and metamaterial structures [23][24][25][26][27][28][29], etc. Here it is important to note that AOT structures of the latter are argued to be fundamentally not real optical isolators if all modes of light in the systems are considered [30].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric optical transmission of a metallic grating-incorporated Fabry–Pérot cavity

Abudula¹,

Sun²

2022

J. Phys. D: Appl. Phys.

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In this report, we show a structure of metallic grating–incorporated Fabry–Pérot (F–P) cavity demonstrating asymmetric optical transmission (AOT) for all transmission modes. The asymmetric transmission basically arises from asymmetric coupling and decoupling of resonant surface plasmons (SP) on both sides of the metallic grating with asymmetric media of different indices. Coupling of the SP mode with anti–resonance mode of the F–P cavity in orthogonal directions further optimizes transmission characteristics of the structure for asymmetric transmission. Particularly, a high contrast AOT is achieved by locating the SP resonance position at center of the anti–resonance band of the F–P cavity. Meanwhile, SP resonance modes induced at different interfaces/regions of the cavity structure influence the transmission properties. The AOT structure has no nanoapertures and critical requirements on profile of the grating surfaces for fabrication, and can be adapted to various optical systems.

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Ultra-wideband, wide angle, asymmetric transmission based chiral metasurface for C and X band applications

Cited by 15 publications

References 50 publications

Lattice constant and polarization-independent high transmission in tellurium-based dielectric metasurfaces

Lattice constant and polarization-independent high transmission in tellurium-based dielectric metasurfaces

A broadband tunable asymmetric transmission structure design

Asymmetric optical transmission of a metallic grating-incorporated Fabry–Pérot cavity

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