Nano-optical probing of exciton wave-functions confined in a GaAs quantum dot

Toshiharu Saiki, Kazunari Matsuda, Shintaro Nomura, Masaru Mihara, Yoshinobu Aoyagi, Selvakumar Nair, Toshihide Takagahara

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have enhanced the performance of near-field scanning optical microscopy (NSOM) in terms of the spatial resolution and the sensitivity in signal detection. A careful preparation of an aperture-NSOM probe provides us with a spatial resolution as high as 30 nm in fluorescence imaging spectroscopy. We have applied this technique to map out the center-of-mass wave functions of an exciton confined in a GaAs quantum dot (a monolayer-high island formed in a quantum well). The spatial profile of the exciton emission, which reflects the shape of the island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations. A theoretical calculation of the spatial distribution of the polarization field quantitatively reproduced the experimental result. Furthermore, mapping of an excited state wave-function with a node structure is also demonstrated. The novel technique can be extensively applied to wave-function engineering in the design and fabrication of quantum devices.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalJournal of Electron Microscopy
Volume53
Issue number2
DOIs
Publication statusPublished - 2004
Externally publishedYes

Fingerprint

Wave functions
Excitons
Semiconductor quantum dots
Near field scanning optical microscopy
quantum dots
excitons
wave functions
near fields
spatial resolution
Polarization
microscopy
scanning
signal detection
Signal detection
polarization
Excited states
Spatial distribution
Semiconductor quantum wells
center of mass
Monolayers

Keywords

  • Exciton
  • Near-field scanning optical microscopy
  • Photoluminescence
  • Quantum dot
  • Spatial resolution
  • Wave function

ASJC Scopus subject areas

  • Instrumentation

Cite this

Nano-optical probing of exciton wave-functions confined in a GaAs quantum dot. / Saiki, Toshiharu; Matsuda, Kazunari; Nomura, Shintaro; Mihara, Masaru; Aoyagi, Yoshinobu; Nair, Selvakumar; Takagahara, Toshihide.

In: Journal of Electron Microscopy, Vol. 53, No. 2, 2004, p. 193-201.

Research output: Contribution to journalArticle

Saiki, Toshiharu ; Matsuda, Kazunari ; Nomura, Shintaro ; Mihara, Masaru ; Aoyagi, Yoshinobu ; Nair, Selvakumar ; Takagahara, Toshihide. / Nano-optical probing of exciton wave-functions confined in a GaAs quantum dot. In: Journal of Electron Microscopy. 2004 ; Vol. 53, No. 2. pp. 193-201.
@article{96616634c3a445deab13d65598b415eb,
title = "Nano-optical probing of exciton wave-functions confined in a GaAs quantum dot",
abstract = "We have enhanced the performance of near-field scanning optical microscopy (NSOM) in terms of the spatial resolution and the sensitivity in signal detection. A careful preparation of an aperture-NSOM probe provides us with a spatial resolution as high as 30 nm in fluorescence imaging spectroscopy. We have applied this technique to map out the center-of-mass wave functions of an exciton confined in a GaAs quantum dot (a monolayer-high island formed in a quantum well). The spatial profile of the exciton emission, which reflects the shape of the island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations. A theoretical calculation of the spatial distribution of the polarization field quantitatively reproduced the experimental result. Furthermore, mapping of an excited state wave-function with a node structure is also demonstrated. The novel technique can be extensively applied to wave-function engineering in the design and fabrication of quantum devices.",
keywords = "Exciton, Near-field scanning optical microscopy, Photoluminescence, Quantum dot, Spatial resolution, Wave function",
author = "Toshiharu Saiki and Kazunari Matsuda and Shintaro Nomura and Masaru Mihara and Yoshinobu Aoyagi and Selvakumar Nair and Toshihide Takagahara",
year = "2004",
doi = "10.1093/jmicro/53.2.193",
language = "English",
volume = "53",
pages = "193--201",
journal = "Microscopy (Oxford, England)",
issn = "2050-5698",
publisher = "Japanese Society of Microscopy",
number = "2",

}

TY - JOUR

T1 - Nano-optical probing of exciton wave-functions confined in a GaAs quantum dot

AU - Saiki, Toshiharu

AU - Matsuda, Kazunari

AU - Nomura, Shintaro

AU - Mihara, Masaru

AU - Aoyagi, Yoshinobu

AU - Nair, Selvakumar

AU - Takagahara, Toshihide

PY - 2004

Y1 - 2004

N2 - We have enhanced the performance of near-field scanning optical microscopy (NSOM) in terms of the spatial resolution and the sensitivity in signal detection. A careful preparation of an aperture-NSOM probe provides us with a spatial resolution as high as 30 nm in fluorescence imaging spectroscopy. We have applied this technique to map out the center-of-mass wave functions of an exciton confined in a GaAs quantum dot (a monolayer-high island formed in a quantum well). The spatial profile of the exciton emission, which reflects the shape of the island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations. A theoretical calculation of the spatial distribution of the polarization field quantitatively reproduced the experimental result. Furthermore, mapping of an excited state wave-function with a node structure is also demonstrated. The novel technique can be extensively applied to wave-function engineering in the design and fabrication of quantum devices.

AB - We have enhanced the performance of near-field scanning optical microscopy (NSOM) in terms of the spatial resolution and the sensitivity in signal detection. A careful preparation of an aperture-NSOM probe provides us with a spatial resolution as high as 30 nm in fluorescence imaging spectroscopy. We have applied this technique to map out the center-of-mass wave functions of an exciton confined in a GaAs quantum dot (a monolayer-high island formed in a quantum well). The spatial profile of the exciton emission, which reflects the shape of the island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations. A theoretical calculation of the spatial distribution of the polarization field quantitatively reproduced the experimental result. Furthermore, mapping of an excited state wave-function with a node structure is also demonstrated. The novel technique can be extensively applied to wave-function engineering in the design and fabrication of quantum devices.

KW - Exciton

KW - Near-field scanning optical microscopy

KW - Photoluminescence

KW - Quantum dot

KW - Spatial resolution

KW - Wave function

UR - http://www.scopus.com/inward/record.url?scp=2442551870&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2442551870&partnerID=8YFLogxK

U2 - 10.1093/jmicro/53.2.193

DO - 10.1093/jmicro/53.2.193

M3 - Article

C2 - 15180216

AN - SCOPUS:2442551870

VL - 53

SP - 193

EP - 201

JO - Microscopy (Oxford, England)

JF - Microscopy (Oxford, England)

SN - 2050-5698

IS - 2

ER -