Terahertz photoluminescence from S.I.-GaAs by below gap excitation via EL2 level

Yutaka Oyama, Hikari Dezaki, Yusaku Shimizu, Kensaku Maeda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Terahertz emission by radiative transitions in semi-conductors via shallow impurity states is investigated. We report on the observation of terahertz photoluminescence from S.I.-GaAs by below gap excitation via EL2 level which is located at the center of band gap. In order to investigate the terahertz wave emission mechanisms, the emission spectra and temperature dependence of the emission intensity are evaluated. It is shown that intense terahertz emission from S.I.-GaAs over 120 K is observed due to the thermal recovery of photo-quenched EL2 meta-stable state, and that the emission peak frequency looks to be attributed to the shallow level energy in GaAs.

Original languageEnglish
Article number022109
JournalApplied Physics Letters
Volume106
Issue number2
DOIs
Publication statusPublished - 2015 Jan 12

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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