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Infrared and Raman studies of confined and interface optical phonons in short-period GaAs/AlAs superlattices with a grating coupler

Infrarot- und Ramanstudien von begrenzten und Grenzflächen optische Phonen in kurzperiodischen GaAs/AlAs-Übergittern mit einem Gitterkoppler
 
: Milekhin, A.G.; Rösch, M.; Batke, E.; Zahn, D.R.T.; Köhler, K.; Ganser, P.; Preobrazhenskij, V.; Semyagin, B.

Journal of vacuum science and technology 17 (1999), Nr.4, S.1738ff
ISSN: 0022-5355
Englisch
Zeitschriftenaufsatz
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductor; integrated circuits; integrierter Schaltkreis; Quantenfilm; quantum wells

Abstract
The optical phonon modes in short-period GaAs/AlAs superlattices were investigated by means of Raman spectroscopy and far-infrared reflection spectroscopy using a grating coupler technique. Grating couplers provide a wave vector transfer parallel to the layers, enabling study of in-plane dispersion of the phonon modes in the superlattice structure. The mixing of confined and interface optical modes was observed as the in-plane phonon wave vector was varied. The experimental frequencies of the superlattice optical modes obtained from infrared and Raman spectra are in good agreement with calculations performed using a dielectric continuum model.

: http://publica.fraunhofer.de/dokumente/PX-18731.html