Broadband and Compact TE-Pass Polarizer Based on Hybrid Plasmonic Grating on LNOI Platform
Shuangxing Dai, Wenqi Yu, Yiru Zhao, Mingxuan Li, Jinye Li, Zhike Zhang, Jianguo Liu
Abstract
A broadband and compact TE-pass/TM-stop polarizer is presented based on hybrid plasmonic grating (HPG) on an x-cut Lithium-Niobate-on-isolator (LNOI) platform. By comprehensively analyzing the effects of metal width on mode effective index, mode similarity, and mode conversion, we demonstrate the structure with a narrow metal layer. The simulation results indicate that the polarizer with a compact length of 9 μm achieves an extinction ratio over 20 dB within the wavelength range from 1470 nm to 1700 nm. The insertion loss is below 2.3 dB in C-band. Furthermore, the polarizer exhibits large fabrication tolerance to current fabrication technology.
Topics & Concepts
BroadbandPolarizerGratingPlasmonOptoelectronicsOpticsMaterials scienceDiffraction gratingOptical filterPhysicsBirefringencePhotonic and Optical DevicesOptical Coatings and GratingsPhotonic Crystals and Applications