Tunable Terahertz Metamaterial Using an Electric Split-Ring Resonator with Polarization-Sensitive Characteristic

Tao Xu,Yu-Sheng Lin

doi:10.3390/app10134660

Abstract

We present a tunable terahertz (THz) metamaterial using an electric split-ring resonator (eSRR), which exhibits polarization-sensitive characteristics. The proposed eSRR is composed of double symmetrical semicircles and two central metal bars. By changing the lengths of two metal bars, the electromagnetic responses can be tuned and switched between dual-band and triple-band resonances in transverse magnetic (TM) mode. Furthermore, by moving the bottom metal bar to change the gap between the two metal bars, the first resonance is stable at 0.39 THz, and the second resonance is gradually blue-shifted from 0.83 to 1.33 THz. The tuning range is 0.50 THz. This means that the free spectrum ranges (FSR) could be broadened by 0.50 THz. This proposed device exhibits a dual-/triple-band switch, tunable filter, tunable FSR and polarization-dependent characteristics. It provides an effective approach to perform tunable polarizer, sensor, switch, filter and other optoelectronics in THz-wave applications.

Highlights

It is generally accepted that the terahertz (THz) range is the frequency range of 0.1–10 THz.In recent years, THz technology has attracted growing attention with the progress of THz sources and instrumentation [1,2]
The transverse electric (TE) electric field is perpendicular to the g1 parameter, and the transverse (TM) electric field is perpendicular to the g parameter
To clarify the electromagnetic responses of magnetic (TM) electric field is perpendicular to the g parameter

Summary

Introduction

It is generally accepted that the terahertz (THz) range is the frequency range of 0.1–10 THz.In recent years, THz technology has attracted growing attention with the progress of THz sources and instrumentation [1,2]. Metamaterials are special materials with artificial micro/nanostructures By adjusting their geometric dimensions, they have many unique electromagnetic responses, including asymmetric transmission, negative refraction index, perfect absorption, and superlens [15,16,17,18,19], and they can work in visible, infrared (IR), THz and microwave spectra ranges [20,21,22,23]. Such a unique electromagnetic response can be used in THz optics applications.

Methods

Results

Conclusion