TITLE

Enhanced terahertz emission from coherent longitudinal optical phonons in a quantum well structure under applied bias

AUTHOR(S)
Mizoguchi, Kohji; Kanzawa, Yusuke; Saito, Shingo; Sakai, Kiyomi; Nakayama, Masaaki
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p171105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the characteristics of terahertz waves emitted from coherent longitudinal optical (LO) phonons in a GaAs/AlAs multiple quantum well structure under an applied electric field. It is found that the intensity of the terahertz wave from the coherent LO phonon is resonantly enhanced in comparison with the intensity in a low electric-field region, under the condition that an intersubband energy is tuned to the LO-phonon energy of GaAs. The pump-energy dependence of the terahertz-wave intensity indicates that the enhancement originates from the double resonances in the Raman scattering process.
ACCESSION #
38712336

 

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