Quantum cascade emission in the III-nitride material system designed with effective interface grading

Alex Y. Song, Rajaram Bhat, Andrew A. Allerman, Jie Wang, Tzu Yung Huang, Chung En Zah, Claire F. Gmachl

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We report the realization of quantum cascade (QC) light emission in the III-nitride material system, designed with effective interface grading (EIG). EIG induces a continuous transition between wells and barriers in the quantum confinement, which alters the eigenstate system and even delocalizes the states with higher energy. Fully transverse-magnetic spontaneous emission is observed from the fabricated III-nitride QC structure, with a center wavelength of ∼4.9 μm and a full width at half maximum of ∼110 meV, both in excellent agreement with theoretical predictions. A multi-peak photo-response spectrum is also measured from the QC structure, which again agrees well with theoretical calculations and verifies the effects of EIG.

Original languageEnglish (US)
Article number132104
JournalApplied Physics Letters
Volume107
Issue number13
DOIs
StatePublished - Sep 28 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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