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Title: Surface and guided acoustic phonons in porous silicon
Authors: Lockwood, D.J.
Kuok, M.H. 
Ng, S.C. 
Rang, Z.L.
Issue Date: 1999
Citation: Lockwood, D.J.,Kuok, M.H.,Ng, S.C.,Rang, Z.L. (1999). Surface and guided acoustic phonons in porous silicon. Physical Review B - Condensed Matter and Materials Physics 60 (12) : 8878-8882. ScholarBank@NUS Repository.
Abstract: Brillouin spectroscopy of porous Si (π-Si) formed on p-type (100) Si has revealed two acoustic-phonon peaks associated with the surface and film modes of the thick porous slab. They exhibit relatively large peak widths that are attributed to fractons. Longitudinal wave guiding is enhanced in high porosity π-Si due to its very low sound velocities compared with Si. Unlike opaque semiconductors where ripple scattering is dominant, the elasto-optic contribution to the scattering mechanism is found to be significant in π-Si. Both phonon velocities show appreciable negative dispersion due to a porosity gradient. ©1999 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 01631829
Appears in Collections:Staff Publications

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