Abstract
We examine acoustic frequency shifting of electromagnetic radiation for situations in which the active medium is terminated by a perfect conductor. For this case, the backward-propagating waves are as intense as the forward ones and all the incident radiation is ultimately reflected. For media in which the static dielectric constant is unity, the reflection spectrum of the unshifted wave can be related to the corresponding transmission spectrum for the situation in which the perfect conductor is removed. For the more general case in which the static dielectric constant of the medium is greater than one, oscillations appear in the reflection spectra that have no analog in the transmission case. These oscillations, whose period is set by the photon round-trip travel time, arise from interference between the reflected waves generated at the vacuum–dielectric interface and the unshifted waves returning from the perfect conductor.
© 1985 Optical Society of America
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