Notch Filter Based on Photonic Crystal Self-Collimation Effect

Abstract

In this paper, a notch filter (NF) based on silicon photonic crystals (PCs) was proposed and the performance was numerically demonstrated. The structure of NF consists of a beam splitter and two mirrors. Light propagates in NF based on self-collimation (SC) effect. The theoretical transmission spectrum at the output port is simulated using the finite-difference time-domain method (FDTD). The simulation results indicate that changing the radius of the beam splitter or the distance between the mirrors affects the beam transmission effect. This NF is simple in structure, small in size, and based on silicon material, has potential application value in photonic integrated circuits.