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 ${\mathrm{SiO}}_2$ 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 $-0.000108\mathrm{dB}$. Additionally, a good extinction ratio of $-13.18\mathrm{dB}$ is obtained at a short device length of 29 μm.

© 2018 Optical Society of America

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