Applied Physics B

, Volume 97, Issue 1, pp 125–128 | Cite as

Study of optical transitions in an individual ZnO tetrapod using two-photon photoluminescence excitation spectrum

  • Y. C. Zhong
  • K. S. Wong
  • A. B. Djurišić
  • Y. F. Hsu
Article

Abstract

Two-photon excited photoluminescence (PL) measurements have been carried out on an individual ZnO tetrapod at low temperature (8 K) using femtosecond laser pulses in the wavelength range of 714–850 nm. Simultaneously PL and second-harmonic generation were observed. The integrated PL intensity excitation spectrum at different two-photon excitation frequencies has eight peaks, which are in good correspondence to the exciton-phonon complexes L1b , L1a , and the free exciton lines B n=3, A n=3, B n=2, A n=2, B n=1, and A n=1 seen in ZnO film. This technique can be used to measure the optical transitions in individual nanostructures, which is very difficult to achieve using the traditional transmission/reflection method.

PACS

78.67.Bf 42.65.-k 78.47.Cd 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Y. C. Zhong
    • 1
  • K. S. Wong
    • 1
  • A. B. Djurišić
    • 2
  • Y. F. Hsu
    • 2
  1. 1.Department of PhysicsHong Kong University of Science and TechnologyKowloon, Hong KongP.R. China
  2. 2.Department of PhysicsUniversity of Hong KongHong KongP.R. China

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