Analysis of the ${\rm TE}$ -Pass or ${\rm TM}$ -Pass Metal-Clad Polarizer With a Resonant Buffer Layer

摘要: A metal-clad optical polarizer with a resonant buffer layer has been investigated by the finite-element method in this paper. Important waveguide design parameters, such as refractive index, thickness, interaction length, fabrication tolerance, and band-stop characteristics, have analyzed detail. Mode coupling within losses due to between input output waveguides are considered using normal mode analysis. The loss behaviors of modes explained roles interpreted. By ultralow index layers, resonance, well its phase-matching conditions excellent performance, also presented discussed for structure first time. Simulations show that high performance can be achieved wide range cladding thicknesses (ges 2 mum) length both TE-pass TM-pass polarizers. With optimized parameters under 3-mm it is possible obtain broadband an extinction ratio more than 40 dB insertion below 0.2 over 200 nm, 30 0.4 28 nm.