Near-field optical control of nonlinear properties of single quantum dots

Toshiharu Saiki, Kenichi Nishi

Research output: Contribution to journalConference articlepeer-review


Near-field spectroscopy of self-assembled InGaAs single quantum dots (QDs) is described. For the application of near-field optical microscope to various versions of advanced spectroscopy of single QDs, the functional performance of a near-field fiber probe is much improved. By optimizing the structure of the probe, high sensitivity in signal detection, as well as high spatial resolution, is successfully achieved. In combination with a standard pump-probe spectroscopic techniques, we realize nonlinear absorption spectroscopy of single QDs at low temperature. The absorption cross section of a single QD is effectively modified by local injection of a few electrons into the QD. Employing a femtosecond pulsed laser, time-resolved photoluminescence spectroscopy is also performed.

Original languageEnglish
Pages (from-to)114-123
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1999
Externally publishedYes
EventProceedings of the 1999 Near-Field Optics: Physics, Devices, and Information Processing - Denver, CO, USA
Duration: 1999 Jul 221999 Jul 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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