Confinement of acoustical vibrations in a semiconductor planar phonon cavity |
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Authors: | Trigo M Bruchhausen A Fainstein A Jusserand B Thierry-Mieg V |
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Institution: | Centro Atómico Bariloche & Instituto Balseiro, C.N.E.A., 8400 San Carlos de Bariloche, Argentina. |
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Abstract: | Extending the idea of optical microcavities to sound waves, we propose a phonon cavity consisting of two semiconductor superlattices enclosing a spacer layer. We show that acoustical phonons can be confined in such layered structures when the spacer thickness is an integer multiple of the acoustic half-wavelength at the center of one of the superlattice folded minigaps. We report Raman scattering experiments that, taking profit of an optical microcavity geometry, demonstrate unambiguously the observation of a phonon-cavity confined acoustical vibration in a GaAs/AlAs based structure. The experimental results compare precisely with photoelastic model calculations of the Raman spectra. |
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