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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 25 — Dec. 10, 2007
  • pp: 17163–17170

Near-field photodetection with high spatial resolution by nanocrystal quantum dots

M. Hegg and L. Y. Lin  »View Author Affiliations

Optics Express, Vol. 15, Issue 25, pp. 17163-17170 (2007)

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We report a new demonstration of nanoscale solution-processed photodetectors by fabricating a nano-sized gap between two electrodes and drop-casting nanocrystal quantum dots (NCQDs) into the gap. We demonstrate a detection sensitivity of 62 pW with a max responsivity of 2.7 mA/W over a device with a nano-gap of 25 nm. Additionally, we characterize the dependence of signal-to-dark current ratio and responsivity on nano-gap size. Responsivity ranges from 1–90 mA/W for a nano-gap size range of 25 nm–1.5 nm. Our results represent the first demonstration of how near-field optical detection for sub-diffraction nanophotonic integrated circuits can be achieved in principle using NCQDs.

© 2007 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(040.5160) Detectors : Photodetectors
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(270.5570) Quantum optics : Quantum detectors

ToC Category:

Original Manuscript: November 5, 2007
Revised Manuscript: December 3, 2007
Manuscript Accepted: December 4, 2007
Published: December 7, 2007

M. Hegg and L. Y. Lin, "Near-field photodetection with high spatial resolution by nanocrystal quantum dots," Opt. Express 15, 17163-17170 (2007)

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