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We report on the direct excitation of 246 GHz longitudinal acoustic phonons in silicon doping superlattices by the resonant absorption of nanosecond-pulsed far-infrared laser radiation of the same frequency. A longitudinally polarized evanescent laser light field is coupled to the superlattice through a germanium prism providing total internal reflection at the superlattice interface. The ballistic phonon signal is detected by a superconducting aluminum bolometer. The sample is immersed in low-temperature liquid helium.


The version of record is available from the publisher at This article is published with a Creative Commons Attribution 3.0 Licence. Copyright 2014 the Authors. doi:10.1088/1757-899X/68/1/012008. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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