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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 3 — Feb. 10, 2014
  • pp: 2247–2258

Guided mode resonance enabled ultra-compact Germanium photodetector for 1.55 μm detection

Alexander Yutong Zhu, Shiyang Zhu, and Guo-Qiang Lo  »View Author Affiliations


Optics Express, Vol. 22, Issue 3, pp. 2247-2258 (2014)
http://dx.doi.org/10.1364/OE.22.002247


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Abstract

We propose a novel technique of enhancing the photodetection capabilities of ultrathin Ge films for normally incident light at 1.55 μm through the guided mode resonance (GMR) phenomenon. Specifically, by suitably patterning the surface of a Ge thin film, it is possible to excite guided modes which are subsequently coupled to free space radiative modes, resulting in spectral resonances that possess locally enhanced near fields with a large spatial extent. Absorption is found to be enhanced by over an order of magnitude over a pristine Ge film of equal thickness. Furthermore, attenuation of incident light for such a structure occurs over very few grating periods, resulting in significantly enhanced theoretical 3 dB bandwidth-efficiency products of ~58 GHz. The nature of the enhancement mechanism also produces spectrally narrow resonances (FWHM ~30 nm) that are polarization sensitive and exhibit excellent angular tolerance. Finally, the proposed device architecture is fully compatible with existing Si infrastructure and current CMOS fabrication processes.

© 2014 Optical Society of America

OCIS Codes
(040.5160) Detectors : Photodetectors
(230.1950) Optical devices : Diffraction gratings
(240.0310) Optics at surfaces : Thin films

ToC Category:
Detectors

History
Original Manuscript: August 13, 2013
Manuscript Accepted: October 14, 2013
Published: January 28, 2014

Citation
Alexander Yutong Zhu, Shiyang Zhu, and Guo-Qiang Lo, "Guided mode resonance enabled ultra-compact Germanium photodetector for 1.55 μm detection," Opt. Express 22, 2247-2258 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-3-2247


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