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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 10228–10233

Nanoscale resonant-cavity-enhanced germanium photodetectors with lithographically defined spectral response for improved performance at telecommunications wavelengths

Krishna C. Balram, Ross M. Audet, and David A. B. Miller  »View Author Affiliations

Optics Express, Vol. 21, Issue 8, pp. 10228-10233 (2013)

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We demonstrate the use of a subwavelength planar metal-dielectric resonant cavity to enhance the absorption of germanium photodetectors at wavelengths beyond the material’s direct absorption edge, enabling high responsivity across the entire telecommunications C and L bands. The resonant wavelength of the detectors can be tuned linearly by varying the width of the Ge fin, allowing multiple detectors, each resonant at a different wavelength, to be fabricated in a single-step process. This approach is promising for the development of CMOS-compatible devices suitable for integrated, high-speed, and energy-efficient photodetection at telecommunications wavelengths.

© 2013 OSA

OCIS Codes
(200.4650) Optics in computing : Optical interconnects
(230.5160) Optical devices : Photodetectors
(250.0250) Optoelectronics : Optoelectronics
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(070.5753) Fourier optics and signal processing : Resonators

ToC Category:

Original Manuscript: February 20, 2013
Revised Manuscript: March 28, 2013
Manuscript Accepted: March 31, 2013
Published: April 18, 2013

Krishna C. Balram, Ross M. Audet, and David A. B. Miller, "Nanoscale resonant-cavity-enhanced germanium photodetectors with lithographically defined spectral response for improved performance at telecommunications wavelengths," Opt. Express 21, 10228-10233 (2013)

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