Piezoelectric field-enhanced second-order nonlinear optical susceptibilities in wurtzite GaN/AlGaN quantum wells

Ansheng Liu, S. L. Chuang, C. Z. Ning

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

Second-order nonlinear optical processes including second-harmonic generation, optical rectification, and difference-frequency generation associated with intersubband transitions in wurtzite GaN/AlGaN quantum well (QW) are investigated theoretically. Taking into account the strain-induced piezoelectric (PZ) effects, we solve the electronic structure of the QW from coupled effective-mass Schrödinger equation and Poisson equation including the exchange-correlation effect under the local-density approximation. We show that the large PZ field in the QW breaks the symmetry of the confinement potential profile and leads to large second-order susceptibilities. We also show that the interband optical pump-induced electron-hole plasma results in an enhancement in the maximum value of the nonlinear coefficients and a redshift of the peak position in the nonlinear optical spectrum. By use of the difference-frequency generation, THz radiation can be generated from a GaN/Al0.75Ga0.25N with a pump laser of 1.55 μm.

Original languageEnglish (US)
Pages (from-to)333-335
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number3
DOIs
StatePublished - Jan 17 2000

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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