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Design of a compact photonic-crystal-based polarizing beam splitter

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5 Author(s)
Liu, Tao ; Opt. Sci. Center, Univ. of Arizona, Tucson, AZ, USA ; Zakharian, A.R. ; Fallahi, M. ; Moloney, J.V.
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A compact polarizing beam splitter based on a photonic crystal (PC) directional coupler with a triangular lattice of air holes is designed and simulated. In the employed PC structure, transverse-electric (TE) light is confined with the photonic bandgap effect, while transverse-magnetic (TM) light is guided through an index-like effect. Due to the different guiding mechanisms, TM and TE light have strikingly different beat lengths, which is utilized to separate the two polarizations in a directional coupler no longer than 24.2 μm. The two-dimensional finite-difference time-domain method of computation is used to evaluate the device performance. The extinction ratios are found to be around 20 dB for both TE and TM polarized light.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 7 )

Date of Publication:

July 2005

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