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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 7 — Apr. 1, 2012
  • pp: 1217–1219

Focusing subwavelength grating coupler for mid-infrared suspended membrane waveguide

Zhenzhou Cheng, Xia Chen, C. Y. Wong, Ke Xu, Christy K. Y. Fung, Y. M. Chen, and Hon Ki Tsang  »View Author Affiliations

Optics Letters, Vol. 37, Issue 7, pp. 1217-1219 (2012)

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A mid-infrared (mid-IR)-focusing subwavelength grating (SWG) coupler and suspended membrane waveguide (SMW) on a silicon-on-insulator wafer are studied. For a transverse-electric mode uniform SWG, finite-difference time-domain simulation predicts 44.2% coupling efficiency with 1 dB bandwidth of about 220 nm and backreflection of 0.78% at 2.75 μm. Then the uniform SWG is curved to a focusing SWG using a phase-matching formula. The SMWs are analyzed by the finite element method and fabricated. An Er3+Pr3+ co-doped mid-IR fiber laser is used for device characterization. The fabricated mid-IR SWG coupler has 24.7% coupling efficiency.

© 2012 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.3060) Integrated optics : Infrared
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.7390) Optical devices : Waveguides, planar
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

Original Manuscript: January 4, 2012
Revised Manuscript: February 10, 2012
Manuscript Accepted: February 10, 2012
Published: March 26, 2012

Zhenzhou Cheng, Xia Chen, C. Y. Wong, Ke Xu, Christy K. Y. Fung, Y. M. Chen, and Hon Ki Tsang, "Focusing subwavelength grating coupler for mid-infrared suspended membrane waveguide," Opt. Lett. 37, 1217-1219 (2012)

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