Room-temperature photoluminescence spectroscopy of self-assembled In0.5Ga0.5As single quantum dots by using highly sensitive near-field scanning optical microscope

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

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

We have studied the optical properties of self-assembled In0.5Ga0.5As single quantum dots (QDs) at room temperature with a near-field scanning optical microscope. Successful detection of a weak photoluminescence (PL) signal from a single QD at room temperature could be achieved by using a double-tapered fiber probe having the advantages of both high collection efficiency and high spatial resolution. Through the precise examination of PL spectra of many QDs, including broadening and saturation behaviors, the homogeneous linewidth of the ground state emission is evaluated as from 9.8 to 14.5 meV.

Original languageEnglish
Pages (from-to)73-75
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number1
Publication statusPublished - 2000 Jan 3
Externally publishedYes

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optical microscopes
near fields
quantum dots
photoluminescence
scanning
room temperature
spectroscopy
examination
spatial resolution
saturation
optical properties
ground state
fibers
probes
high resolution

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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AU - Saiki, Toshiharu

AU - Saito, H.

AU - Nishi, K.

PY - 2000/1/3

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AB - We have studied the optical properties of self-assembled In0.5Ga0.5As single quantum dots (QDs) at room temperature with a near-field scanning optical microscope. Successful detection of a weak photoluminescence (PL) signal from a single QD at room temperature could be achieved by using a double-tapered fiber probe having the advantages of both high collection efficiency and high spatial resolution. Through the precise examination of PL spectra of many QDs, including broadening and saturation behaviors, the homogeneous linewidth of the ground state emission is evaluated as from 9.8 to 14.5 meV.

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