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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 15 — Aug. 1, 2014
  • pp: 4514–4517

Low-loss ultracompact transverse-magnetic-pass polarizer with a silicon subwavelength grating waveguide

Xiaowei Guan, Pengxin Chen, Sitao Chen, Peipeng Xu, Yaocheng Shi, and Daoxin Dai  »View Author Affiliations


Optics Letters, Vol. 39, Issue 15, pp. 4514-4517 (2014)
http://dx.doi.org/10.1364/OL.39.004514


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Abstract

An ultracompact and low-loss TM-pass polarizer on silicon is proposed and demonstrated experimentally with a subwavelength-grating (SWG) waveguide. The SWG waveguide is designed to support Bloch mode for TM polarization so that the incident TM-polarized light goes through the SWG waveguide with very low excess loss. On the other hand, for TE polarization, the SWG waveguide works as a Bragg reflector, and consequently the incident TE-polarized light is reflected. For a fabricated 9μm long polarizer (with the period number N=20), the measured extinction ratio is 27dB and the excess loss is 0.5dB at the central wavelength 1550 nm. The bandwidth to achieve an extinction ratio of 20 dB is about 60 nm (from 1520 to 1580 nm). When increasing the period number to N=40, the measured extinction ratio is up to 40 dB (which is not as high as the expected theoretical value 65 dB due to the limit of the measurement system).

© 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:
Optical Devices

History
Original Manuscript: April 24, 2014
Revised Manuscript: May 29, 2014
Manuscript Accepted: June 11, 2014
Published: July 28, 2014

Citation
Xiaowei Guan, Pengxin Chen, Sitao Chen, Peipeng Xu, Yaocheng Shi, and Daoxin Dai, "Low-loss ultracompact transverse-magnetic-pass polarizer with a silicon subwavelength grating waveguide," Opt. Lett. 39, 4514-4517 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-15-4514

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