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The influence of surfaces and interfaces on coherent phonons in semiconductors

✍ Scribed by C.-K. Sun; J.C. Liang; S.P. DenBaars; D.S. Kim; Y.D. Cho; G.D. Sanders; J. Simmons; C.J. Stanton

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
100 KB
Volume
27
Category
Article
ISSN
0749-6036

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✦ Synopsis

Experiments have shown that ultrafast optical excitation of semiconductors can produce oscillating changes in the optical properties of the material. The frequency of the oscillations in transmission or reflection usually matches one of the phonon modes, typically the q = 0 optical mode. These oscillations are known as coherent phonons. We discuss the role of surfaces and interfaces on the coherent phonon signal. We show that: (1) the coherent phonon signal can be used as a probe of the surface depletion field and (2) multiple interfaces as in a superlattice, can drastically alter the coherent phonon spectrum: screening of the modes in the superlattices is reduced and acoustic modes can now be excited.

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