A surface plasmon enhanced infrared photodetector based on InAs quantum dots

Chun Chieh Chang, Yagya D. Sharma, Yong Sung Kim, Jim A. Bur, Rajeev V. Shenoi, Sanjay Krishna, Danhong Huang, Shawn Yu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

246 Citations (Scopus)

Abstract

In this paper, we report a successful realization and integration of a gold two-dimensional hole array (2DHA) structure with semiconductor InAs quantum dot (QD). We show experimentally that a properly designed 2DHA-QD photodetector can facilitate a strong plasmonic-QD interaction, leading to a 130% absolute enhancement of infrared photoresponse at the plasmonic resonance. Our study indicates two key mechanisms for the performance improvement. One is an optimized 2DHA design that permits an efficient coupling of light from the far-field to a localized plasmonic mode. The other is the close spatial matching of the QD layers to the wave function extent of the plasmonic mode. Furthermore, the processing of our 2DHA is amenable to large scale fabrication and, more importantly, does not degrade the noise current characteristics of the photodetector. We believe that this demonstration would bring the performance of QD-based infrared detectors to a level suitable for emerging surveillance and medical diagnostic applications.

Original languageEnglish
Pages (from-to)1704-1709
Number of pages6
JournalNano Letters
Volume10
Issue number5
DOIs
Publication statusPublished - 2010 May 12
Externally publishedYes

Keywords

  • Infrared detection
  • Quantum dots
  • Subwavelength optics
  • Surface Plasmon

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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