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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 24 — Dec. 15, 2012
  • pp: 5181–5183

Broadband focusing grating couplers for suspended-membrane waveguides

Zhenzhou Cheng, Xia Chen, Chi Yan Wong, Ke Xu, and Hon Ki Tsang  »View Author Affiliations

Optics Letters, Vol. 37, Issue 24, pp. 5181-5183 (2012)

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We propose and demonstrate broadband focusing grating couplers for suspended-membrane waveguides on silicon-on-insulator both in near-infrared (near-IR) and in mid-IR wavelength range. Finite-difference time-domain simulation predicts 100nm 3 dB bandwidth with 1.7dB coupling efficiency for an apodized grating in near-IR. 3.5dB maximum coupling efficiency and 90nm 3 dB bandwidth are realized experimentally. In mid-IR, 5.5dB maximum coupling efficiency from a uniform focusing grating is measured at 2.75 μm, and 500nm 3 dB bandwidth is predicted theoretically.

© 2012 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.0130) Integrated optics : Integrated optics
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: October 9, 2012
Revised Manuscript: November 20, 2012
Manuscript Accepted: November 20, 2012
Published: December 12, 2012

Zhenzhou Cheng, Xia Chen, Chi Yan Wong, Ke Xu, and Hon Ki Tsang, "Broadband focusing grating couplers for suspended-membrane waveguides," Opt. Lett. 37, 5181-5183 (2012)

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  1. Z. Cheng, X. Chen, C. Y. Wong, K. Xu, and H. K. Tsang, IEEE Photon. J. 4, 1510 (2012). [CrossRef]
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