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A photoexcited wideband silicon-based tunable metamaterial absorber with wide-angle absorption for terahertz waves

LIANSHENG WANG1,* , DONGYAN XIA2, QUANHONG FU3, XUEYONG DING1, YUAN WANG1

Affiliation

  1. Science and Technology Department, Sanya University, Sanya, Hainan, 572022, China
  2. Finance and Economics Department, Sanya University, Sanya, Hainan, 572022, China
  3. Science Department, Northwestern Polytechnical University, Xi’an, Shanxi, 710072, China

Abstract

We design a new kind of metamaterial absorber in the form of photoconductive silicon disk capable of having tunable wideband absorption of terahertz waves. We demonstrate the absorption of absorber reach up to 90% within the entire frequency band of 4THz~6.5THz when the conductivity of silicon is 5000S/m, and it process the tunable property by alter the photoexcited conductivity of silicon disk. Moreover, we study the electric and magnetic fields distribution at some frequency within the absorption band in order to analysis the wideband absorption mechanism. Finally, we prove that the absorber has the property of polarization-insensitive and wide-angle absorption for terahertz waves. The proposed metamaterial absorber is low-cost, easy to prepare, and useful for terahertz waves modulation and switching.

Keywords

Wideband, Tunable, Metamaterial absorber, Terahertz waves.

Citation

LIANSHENG WANG, DONGYAN XIA, QUANHONG FU, XUEYONG DING, YUAN WANG, A photoexcited wideband silicon-based tunable metamaterial absorber with wide-angle absorption for terahertz waves, Optoelectronics and Advanced Materials - Rapid Communications, 14, 7-8, July-August 2020, pp.338-343 (2020).

Submitted at: Aug. 11, 2019

Accepted at: Aug. 18, 2020