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Phys. Rev. B 54, 17805–17811 (1996)

Vibrational excitations in thin films studied by spatial dispersion Brillouin spectroscopy

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Hua Xia*
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1 and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

H. E. Jackson
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221

K. J. Chen and X. K. Zhang
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

D. Walton
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

Received 21 February 1996; published in the issue dated 15 December 1996

By combining a tandem multipass Fabry-Pérot (FP) interferometer with a charge-coupled-device (CCD) imaging detector, we have successfully observed surface Rayleigh waves, longitudinal guided modes, and bulk acoustic modes in dilute magnetic semiconductors, Si- and Ge-based films and superlattices. The inelastically scattered light from acoustic modes is transmitted through the FP off-axis, and is focused on the CCD where it forms concentric rings. We also have demonstrated that the high sensitivity of our system allows the observation of weak bulk acoustic modes from opaque a-Si:H/a-SiNx:H superlattices.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.17805
DOI:
10.1103/PhysRevB.54.17805
PACS:

*Author to whom correspondence should be addressed. Department of Physics, Colorado State University, Fort Collins, Colorado 80523. Electronic address: huax@lamar.colostate.edu

 
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