Circuladores ópticos e de THz com 3 e 4 portas

Abstract

This work presents new circulators with three and four ports based on two-dimensional photonic crystals with square and triangular lattices. The three-port circulators are forkshaped and T-shaped, while the four-port circulator is composed of two T-shaped circulators connected in cascade, and it can present two different types of symmetry. The theoretical part of the work consists in the analysis of the scattering matrix of developed devices. By adjusting the resonant cavities that comprise the proposed circulators it was possible to obtain high levels of isolation, low insertion losses and high bandwidth. Also, it is shown the operation of the four-port circulator as a single-pole triple-throw switch.