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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 16 — Aug. 15, 2013
  • pp: 3005–3008

Ultracompact and broadband polarization beam splitter utilizing the evanescent coupling between a hybrid plasmonic waveguide and a silicon nanowire

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


Optics Letters, Vol. 38, Issue 16, pp. 3005-3008 (2013)
http://dx.doi.org/10.1364/OL.38.003005


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Abstract

An ultracompact polarization beam splitter (PBS) is proposed based on an asymmetrical directional coupler consisting of a silicon hybrid plasmonic waveguide (HPW) and a silicon nanowire. The widths of the two coupling waveguides are chosen so that the phase-matching condition is satisfied for TE polarization only while the phase mismatch is significant for TM polarization. A sharply bent silicon HPW is connected at the thru port to play the role of polarizer by utilizing its polarization-dependent loss. With the present principle, the designed PBS has a footprint as small as only 1.9μm×3.7μm, which is the shortest PBS reported until now, even when large waveguide dimensions (e.g., the waveguide widths w1,2=300nm and the gap width wgap=200nm) are chosen to simplify the fabrication process. The numerical simulations show that the designed PBS has a very broad band (120nm) with an extinction ratio >12dB and a large fabrication tolerance to allow a waveguide width variation of ±30nm.

© 2013 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Integrated Optics

History
Original Manuscript: May 22, 2013
Revised Manuscript: July 15, 2013
Manuscript Accepted: July 15, 2013
Published: August 7, 2013

Citation
Xiaowei Guan, Hao Wu, Yaocheng Shi, Lech Wosinski, and Daoxin Dai, "Ultracompact and broadband polarization beam splitter utilizing the evanescent coupling between a hybrid plasmonic waveguide and a silicon nanowire," Opt. Lett. 38, 3005-3008 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-16-3005


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