Quantum dash intermixing

Hery Susanto Djie*, Yang Wang, Yun Hsiang Ding, Dong Ning Wang, James C.M. Hwang, Xiao Ming Fang, Ying Wu, Joel M. Fastenau, Amy W.K. Liu, Gerard T. Dang, Wayne H. Chang, Boon S. Ooi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


We investigate the intermixing effect in InAs/InAlGaAs quantum-dash-in-well structures grown on InP substrate. Both impurity-free vacancy disordering (IFVD) via dielectric cap annealing, and impurity-induced disordering (IID) using nitrogen ion-implantation techniques have been employed to spatially control the group-III intermixing in the quantum-dash (Qdash) system. Differential bandgap shifts of up to 80 nm and 112 nm have been observed from the IFVD and IID processes, respectively. Compared to the control (nonintermixed) lasers, the light-current characteristics for the 125 nm wavelength shifted Qdash lasers are not significantly changed, suggesting that the quality of the intermixed material is well preserved. The intermixed lasers exhibit a narrower linewidth as compared to the as-grown laser due to the improved dash homogeneity. The integrity of the material is retained after intermixing, suggesting the potential application for the planar integration of multiple active/passive Qdash-based devices on a single InP chip.

Original languageEnglish (US)
Pages (from-to)1239-1249
Number of pages11
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
StatePublished - Jul 2008
Externally publishedYes


  • Disordering
  • Interdiffusion
  • Ion-implantation
  • Photonic integrated circuits (PICs)
  • Quantum-dash (Qdash)
  • Quantum-dot intermixing
  • Quantum-well (QW) intermixing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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