Ultra-thin polarization independent broadband terahertz metamaterial absorber

doi:10.1007/s12200-021-1223-3

Front. Optoelectron.

2021, Vol. 14

Issue (3) : 288-297 https://doi.org/10.1007/s12200-021-1223-3

RESEARCH ARTICLE

Ultra-thin polarization independent broadband terahertz metamaterial absorber

C. GANDHI, P. RAMESH BABU, K. SENTHILNATHAN(

)

Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India

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Abstract

In this work, we present the design of a polarization independent broadband absorber in the terahertz (THz) frequency range using a metasurface resonator. The absorber comprises of three layers, of which, the top layer is made of a vanadium dioxide (VO₂) resonator with an electrical conductivity of σ = 200000 S/m; the bottom layer consists of a planar layer made of gold metal, and a dielectric layer is sandwiched between these two layers. The optimized absorber exhibits absorption greater than 90% from 2.54−5.54 THz. Thus, the corresponding bandwidth of the designed absorber is 3 THz. Further, the thermal tunable absorption and reflection spectra have been analyzed by varying the electrical conductivity of VO₂. The impact of the various geometrical parameters on the absorption characteristics has also been assessed. The physics of generation of broadband absorption of the proposed device has been explored using field analysis. Finally, the absorption characteristics of the unit cell has been studied for various incident and polarization angles.

Keywords terahertz (THz) metasurface tunable absorber

Corresponding Author(s): K. SENTHILNATHAN

Just Accepted Date: 26 July 2021 Online First Date: 17 August 2021 Issue Date: 30 September 2021

Cite this article:

C. GANDHI,P. RAMESH BABU,K. SENTHILNATHAN. Ultra-thin polarization independent broadband terahertz metamaterial absorber[J]. Front. Optoelectron., 2021, 14(3): 288-297.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-021-1223-3
https://academic.hep.com.cn/foe/EN/Y2021/V14/I3/288

Fig.1 Geometry of the designed absorber. (a) 3D view. (b) 2D view. p = 24 μm, t₁ = 0.4 μm, t₂ = 10 μm, t₃ = 0.2 μm, l = 24 μm, b = 2 μm, r = 5 μm, and w = 1.5 μm

Fig.2 Absorption of the proposed metasurface absorber in different states of the resonator

Fig.3 Extracted material parameters. (a) Z. (b) ε-μ

Fig.4 Absorption. (a) Separate resonator. (b) Combination of the resonator

Fig.5 Tunable reflection and absorption with electrical conductivity of VO₂. (a) Reflection. (b) Absorption

Fig.6 Field distribution at resonance frequencies of 3.09 and 4.89 THz. (a) Electric field along the z-direction. (b) Normalized electric field. (c) Magnetic field along the y-direction

Fig.7 Analysis of absorption over various geometrical parameters. (a) Length of the strip. (b) Width of the strip. (c) Outer radius of the circle. (d) Width of the circle. (e) Periodicity of the unit cell

Fig.8 Thickness response of (a) top resonator VO₂ (t₃) and (b) dielectric layer (t₂)

Fig.9 Incident angle sensitivity of the absorber. (a) TE mode of polarization. (b) TM mode of polarization

Fig.10 Absorption of proposed absorber for different polarization angle. (a) TE polarization. (b) TM polarization

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