Si-core photonic crystal fiber transverse-electric pass polarizer

Abstract

Photonic crystal fibers (PCFs) have been extensively used in literature for designing polarization handling devices. Further, the Si material has advantages in terms of low loss transmission with a high refractive index. In this paper, a novel design of transverse-electric (TE) pass polarizer based on Si-core photonic crystal fiber (SC-PCF) is reported and studied using full vectorial finite element method. The suggested PCF has a SiO2 cladding background and is selectively filled with gold nanorods. Further, an elliptical Si-core is used to increase the birefringence between the two polarizing modes. Therefore, the surface plasmon modes around the gold nanorods are highly coupled with the quasi-transverse-magnetic (TM) core modes while no coupling occurs with the quasi-TE core mode. Consequently, high and low confinement losses are achieved for the quasi-TM and quasi-TE core modes, respectively. Accordingly, a TE-pass polarizer is realized with an insertion loss of −0.000108 dB. Additionally, a good extinction ratio of −13.18 dB is obtained at a short device length of 29 μm.