Terahertz wave switch based on photonic crystal ring resonators

Abstract

In this paper, we have presented a compact and integrated terahertz wave switch design based on photonic crystal ring resonators. The photonic crystal structure with square lattice is investigated and applied for design of ring resonators. The switching mechanism of this novel switch is based on the variation of the resonant frequency of the ring resonator inserted between two parallel waveguides. The refractive index of the holes of the structure filled with polyaniline electrorheological fluids are varied by applied external electric field, the result of which is the variation of the ring resonant frequency. The proposed device is analyzed by using finite difference time domain method. Numerical simulation results show that this switch has high extinction ratio, small size, low voltage and advantages of selectivity of coupling THz wave to different output ports.

Terahertz Transmission Characteristics of Free-Standing Fractal Jesus-Cross Structure

“…As an essential part of a terahertz wave system, terahertz wave manipulation is highly required. Different functional THz devices have been reported, such as modulator [1], filters [2,3], switches [4][5][6], phase shifters [7], polarizers [8], absorbers [9,10], and splitters [11][12][13]. We all know that terahertz wave filter is a kind of important signal processing device [14][15][16].…”