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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 3902–3910

Waveguide-integrated microdisk light-emitting diode and photodetector based on Ge quantum dots

Xuejun Xu, Takuya Maruizumi, and Yasuhiro Shiraki  »View Author Affiliations

Optics Express, Vol. 22, Issue 4, pp. 3902-3910 (2014)

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Microdisk integrated with a bus waveguide is fabricated on silicon-on-insulator substrate containing Ge self-assembled quantum dots as active medium. The device is demonstrated to be operated as both light-emitting diode and photodetector. At forward bias, carriers are injected into the microdisk and light emission at 1.45–1.6 μm is extracted through the waveguide via microdisk-waveguide coupling. Sharp resonant peaks with Q-factor as high as 1350 are obtained in the electroluminescence spectra, corresponding to whispering gallery modes of the microdisk. At reverse bias, the device functions as a resonant cavity enhanced photodetector with wavelength-selective photo-response. The photo-current at resonant wavelength of 1533.65 nm is 50 times larger than that at non-resonant wavelength. The dark current density of the photodetector is as low as 0.29 mA/cm2 up to −10 V bias and the peak responsivity is 5.645 mA/W.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.3670) Optical devices : Light-emitting diodes
(230.5160) Optical devices : Photodetectors
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Integrated Optics

Original Manuscript: November 8, 2013
Revised Manuscript: January 20, 2014
Manuscript Accepted: February 3, 2014
Published: February 12, 2014

Xuejun Xu, Takuya Maruizumi, and Yasuhiro Shiraki, "Waveguide-integrated microdisk light-emitting diode and photodetector based on Ge quantum dots," Opt. Express 22, 3902-3910 (2014)

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