Far infrared measurements of bulk and surface phonons in GaAs/AlAs superlattices |
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| Authors: | T Dumelow A A Hamilton T J Parker D R Tilley C T B Foxon D Hilton and K J Moore |
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| Institution: | (1) Department of Physics, Royal Holloway and Bedford New College, TW20 0EX Egham, Surrey, UK;(2) Department of Physics, University of Essex, Wivenhoe Park, CO4 3SQ Colchester, Essex, UK;(3) Philips Research Laboratories, Cross Oak Lane, RH1 5HA Redhill, Surrey, UK |
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| Abstract: | We have used far-infrared oblique-incidence reflection spectroscopy to study bulk phonon polaritons, and attenuated total reflection (ATR) spectroscopy to study surface phonon polaritons, in long-period GaAs/AlxGa1–xAs and short-period GaAs/AlAs superlattices. Results on the former are in good agreement with an effective-medium bulk-slab model of the dielectric tensor of the superlattice; results on the latter are analysed in terms of a model that contains dielectric-tensor contributions from the confined optic phonons. |
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