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Development of a Micro-Brillouin Spectrometer and its Application to Measurements of the Elastic Properties of Condensed Matter
Tae Hyun Kim · Jae-Hyeon Ko ∗
Department of Physics, Hallym University, Chuncheon 200-702 (Received 28 April 2011 : revised 17 June 2011 : accepted 30 June 2011)
A micro-Brillouin spectrometer by which the elastic properties of condensed matter could be measured on a micrometer scale was developed by combining a conventional tandem multi-pass Fabry-Perot interferometer and a specially-designed microscope in a backscattering configuration.
With the high magnifying power and short focal length of the objective lens, a spatial resolution of about 1 µm could be obtained. By using this spectrometer, we were able to measure successfully for the first time the elastic constants of an ibuprofen single crystal, one of the most representative pharmaceuticals. In addition, the micro-heterogeneity of Pb(Zr
1−xTi
x)O
3(PZT) single crystals was investigated by monitoring the positional dependence of the Brillouin shift. The Brillouin shift was found to be very sensitive to the measurement position, which indicates that the elastic property of PZT single crystals differs from one micro-area to another. This was ascribed to a possible compositional gradient inherent in the PZT single crystals. The present study showed that the micro-Brillouin spectrometer could be a powerful tool in investigations of the elastic properties of very small amounts of condensed matter and their changes on a micrometer scale.
-687-
PACS numbers: 78.35.+c, 77.84.Cg, 62.20.D-, 62.30.+d, 07.60.Ly
Keywords: Micro-Brillouin spectrometer, Fabry-Perot Interferometer, Micro-heterogeneity, Elastic Property
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