Near-field spectroscopy of single quantum dots at room temperature

K. Ikeda, K. Matsuda, H. Saito, K. Nishi, Toshiharu Saiki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The observation of photoluminescence spectra of self-assembled single InGaAs quantum dots at room temperature was performed under weak excitation conditions using a near-field scanning optical microscope. Operation in illumination-collection mode with a highly sensitive double-tapered optical fibre probe enabled detection of weak photoluminescence signals at room temperature with high efficiency and high spatial resolution. Each single quantum dot was imaged with a spatial resolution of about 250 nm, which corresponded to a quarter of the wavelength of the photoluminescence from quantum dots. The photoluminescence yields of individual quantum dots were widely distributed and were found to decrease with photoluminescence energy. This result serves as a clue to be pursued for better understanding of the thermal excitation of the carrier from confined states in quantum dots.

Original languageEnglish
Pages (from-to)209-211
Number of pages3
JournalJournal of Microscopy
Volume202
Issue number1
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Quantum Dots
Semiconductor quantum dots
Spectrum Analysis
near fields
Photoluminescence
quantum dots
Spectroscopy
photoluminescence
Temperature
room temperature
spectroscopy
spatial resolution
Optical Fibers
Carrier State
optical microscopes
Lighting
excitation
Optical fibers
Microscopes
Hot Temperature

Keywords

  • Double-tapered optical fibre probe
  • Emission linewidth
  • Illumination-collection mode
  • Inter-level spacing
  • Near-field scanning optical microscopy
  • Photoluminescence
  • Quantum dot

ASJC Scopus subject areas

  • Instrumentation

Cite this

Near-field spectroscopy of single quantum dots at room temperature. / Ikeda, K.; Matsuda, K.; Saito, H.; Nishi, K.; Saiki, Toshiharu.

In: Journal of Microscopy, Vol. 202, No. 1, 2001, p. 209-211.

Research output: Contribution to journalArticle

Ikeda, K. ; Matsuda, K. ; Saito, H. ; Nishi, K. ; Saiki, Toshiharu. / Near-field spectroscopy of single quantum dots at room temperature. In: Journal of Microscopy. 2001 ; Vol. 202, No. 1. pp. 209-211.
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