Compact and broadband polarization beam splitter on lithium-niobate-on-insulator using a hybrid plasmonic waveguide
- 1 April 2023
- journal article
- research article
- Published by SPIE-Intl Soc Optical Eng in Journal of Nanophotonics
- Vol. 17 (02), 026005
- https://doi.org/10.1117/1.jnp.17.026005
Abstract
A compact and broadband polarization beam splitter (PBS) is proposed based on an asymmetric directional coupler consisting of a hybrid plasmonic waveguide and a ridge waveguide on lithium-niobate-on-insulator. Due to the surface plasma polariton (SPP) effect, the phase-matching condition is satisfied for transverse electric polarization, whereas the transverse magnetic polarization has a significant phase mismatch by choosing reasonable widths of both waveguides. A short ( ∼ 28 μm long) PBS is designed while the gap width is chosen to be 200 nm to make it easy to fabricate. Numerical simulations show that the designed PBS has a broad bandwidth (>130 nm) for an extinction ratio of >15 dB and a large fabrication tolerance for the variation of the waveguide width (over ± 50 nm).Keywords
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