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

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...

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Bibliographic Details
Published in:IEEE photonics technology letters 2005-07, Vol.17 (7), p.1435-1437
Main Authors: Tao Liu, Zakharian, A.R., Fallahi, M., Moloney, J.V., Mansuripur, M.
Format: Article
Language:English
Subjects:
Beam splitters
Computer simulation
Devices
Directional couplers
Finite difference method
Lattices
Optical devices
Optical interferometry
Optical polarization
Optical propagation
Optical waveguides
Photonic band gap
Photonic crystals
photonic crystals (PCs)
Photonics
Polarization
polarizing beam splitters (PBSs)
Polycarbonates
Tellurium
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2005.848278