Abstract
Brillouin scattering from thin samples including thin glass, polymer film, and optical fiber, has been studied. Edge illumination of the samples, as opposed to the ordinary method, was used because of the increased scattering intensity. With either method, two inner scattering angles exist between incident and scattered light because of reflections inside the samples, but only one corresponds to the backscattering component. The extra peak in the Brillouin spectrum can be identified as another longitudinal mode of the backscattering component, rather than as a transverse or surface mode. The spectra showed a clear angular dependence of the Brillouin shift and the intensity.
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