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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 2 — Jan. 15, 2014
  • pp: 259–262

Extremely small polarization beam splitter based on a multimode interference coupler with a silicon hybrid plasmonic waveguide

Xiaowei Guan, Hao Wu, Yaocheng Shi, and Daoxin Dai  »View Author Affiliations


Optics Letters, Vol. 39, Issue 2, pp. 259-262 (2014)
http://dx.doi.org/10.1364/OL.39.000259


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Abstract

A novel polarization beam splitter (PBS) with an extremely small footprint is proposed based on a multimode interference (MMI) coupler with a silicon hybrid plasmonic waveguide. The MMI section, covered with a metal strip partially, is designed to achieve mirror imaging for TE polarization. On the other hand, for TM polarization, there is almost no MMI effect since the higher-order TM modes are hardly excited due to the hybrid plasmonic effect. With this design, the whole PBS including the 1.1 μm long MMI section as well as the output section has a footprint as small as 1.8μm×2.5μm. Besides, the fabrication process is simple since the waveguide dimension is relatively large (e.g., the input/output waveguides widths w300nm and the MMI width wMMI=800nm). Numerical simulations show that the designed PBS has a broad band of 80nm for an ER >10dB as well as a large fabrication tolerance to allow a silicon core width variation of 30nm<Δw<50nm and a metal strip width variation of 200nm<Δwm<0.

© 2014 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.5440) Optical devices : Polarization-selective devices
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Integrated Optics

History
Original Manuscript: October 28, 2013
Manuscript Accepted: November 17, 2013
Published: January 7, 2014

Citation
Xiaowei Guan, Hao Wu, Yaocheng Shi, and Daoxin Dai, "Extremely small polarization beam splitter based on a multimode interference coupler with a silicon hybrid plasmonic waveguide," Opt. Lett. 39, 259-262 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-2-259


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