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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 26,
  • Issue 10,
  • pp. 1234-1241
  • (2008)

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

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Abstract

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 the refractive index, thickness, interaction length, fabrication tolerance, and band-stop characteristics, have been analyzed in detail. Mode coupling within the polarizer and the losses due to coupling between the polarizer and the input and output waveguides are considered using the normal mode analysis. The loss behaviors of ${\rm TE}$ and ${\rm TM}$ modes are explained and the roles of the resonant buffer layer are interpreted. By using ultralow index layers, ${\rm TM}_{0}$ resonance, as well as its phase-matching conditions and excellent performance, has also been presented and discussed for this structure for the first time. Simulations show that high performance can be achieved in a wide range of the cladding thicknesses ($\geq 2~\mu $m) and interaction length for both ${\rm TE}$-pass and ${\rm TM}$-pass polarizers. With optimized parameters under 3-mm length, it is possible to obtain a broadband ${\rm TE}$-pass polarizer with an extinction ratio of more than 40dB and insertion loss below 0.2 dB over 200 nm, and a ${\rm TM}$-pass polarizer with an extinction ratio of more than 30 dB and insertion loss below 0.4 dB over 28 nm.

© 2008 IEEE

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