Transition energy control via strain in single quantum dots embedded in micromachined air-bridge

Toshihiro Nakaoka*, Takaaki Kakitsuka, Toshio Saito, Yasuhiko Arakawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have fabricated a micromachined air-bridge in which InGaAs self-assembled quantum dots are embedded. Electrostatic voltage applied between the air-bridge and the substrate pulls the air-bridge down. The deformation of the bridge produces additional strain on the matrix and the dots modifying the electronic states. The modification has been detected through a photoluminescence peak shift of a single dot. The effect of the deformation on the electronic states is evaluated with the aid of theoretical calculation using a finite element method. The good agreement between calculated and experimental energy shifts demonstrates that the energy shift is due to the strain induced by the bridge deformation. Based on the result, we discuss the capability of this micromachined device with quantum dots to control the zero-dimensional electronic system and to measure small deformation and strain.

Original languageEnglish
Pages (from-to)2069-2072
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number4 B
Publication statusPublished - 2004 Apr
Externally publishedYes


  • Microelectromechanical systems
  • Photoluminescence
  • Self-assembled quantum dots
  • Single dot spectroscopy
  • Strain

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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