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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 35 — Dec. 10, 2009
  • pp: 6760–6764

Flat-top steep-edge photodetector with cascaded grating structure

Xu Zhang, Yongqing Huang, Xiaomin Ren, Hui Huang, and Qi Wang  »View Author Affiliations


Applied Optics, Vol. 48, Issue 35, pp. 6760-6764 (2009)
http://dx.doi.org/10.1364/AO.48.006760


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Abstract

A new type of photodetector with cascaded waveguide grating filters as a bottom reflection mirror is proposed. A greatly improved spectral response is shown to follow by the integration of a waveguide grating into classical thin-film homogeneous layers. Calculation results for a single grating, a cascaded-double grating, and a cascaded-triple grating structure are demonstrated. An increasing rectangular spectral response is obtained by cascading two or three grating filters. Compared with a traditional photodetector with distributed Bragg reflectors, this new type of photodetector with the same materials requires significantly fewer layers while maintaining narrow flattop response, high peak efficiency, and low sideband reflectance.

© 2009 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(230.4170) Optical devices : Multilayers
(230.5160) Optical devices : Photodetectors

ToC Category:
Optical Devices

History
Original Manuscript: July 6, 2009
Revised Manuscript: October 19, 2009
Manuscript Accepted: October 30, 2009
Published: December 3, 2009

Citation
Xu Zhang, Yongqing Huang, Xiaomin Ren, Hui Huang, and Qi Wang, "Flat-top steep-edge photodetector with cascaded grating structure," Appl. Opt. 48, 6760-6764 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-35-6760


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