Optical nonlinearity and ultrafast-carrier dynamics of a strained quantum-well saturable Bragg reflector

Tze An Liu, Jia Min Shieh, Kai-Feng Huang, Ci Ling Pan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present observations of the wavelength-dependent time-resolved differential reflection in the multiple-strained-quantum-well saturable Bragg reflector (SSBR). It is shown that the large optical nonlinearity of transient reflectivity (ΔR/R) of ∼4% for a pumping wavelength of 755 nm sharply reversed to -0.6% at 760 nm. The relationships of fast- and slow-carrier lifetimes with pumping wavelength are also discussed. We conclude that the strain-induced piezoelectric field and free-electron absorption play a dominant role in determining the optical nonlinearity and its carrier dynamics. This is the first time that wavelength-dependent time-resolved reflectivity in SSBR has been presented in detail.

Original languageEnglish
Pages (from-to)5869-5873
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number9 A
DOIs
StatePublished - 1 Sep 2003

Keywords

  • Exciton
  • Nonlinearity
  • Strained quantum-well saturable Bragg reflector (SSBR)
  • Transient photoreflectivity
  • Ultrafast-carrier dynamics
  • Wavelength tuning

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