Finite size effects in Brillouin scattering from silica glass

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René Vacher, Simon Ayrinhac, Marie Foret, Benoît Rufflé, and Eric Courtens
Groupe de Physique des Verres et Spectroscopies, LCVN, UMR CNRS 5587, Université Montpellier II, F-34095 Montpellier Cedex 5, France

Received 12 January 2006; revised 23 June 2006; published 28 July 2006

Finitesample sizes increase the measured Brillouin scattering linewidths. This shouldnot be mistaken for a genuine damping of sound. Usinghigh-resolution interferometry, we show that in silica glass under ambientconditions and with visible light excitation, the additional width becomesobservable for sample thicknesses below 0.2 mm. Similarly, light absorption reducesthe scattering volume, producing a strong contribution to the widthfor excitation of bulk samples above their absorption edge. Theresulting limitations are illustrated for UV Brillouin scattering from silica.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.012203
DOI:	10.1103/PhysRevB.74.012203
PACS:	78.35.+c; 62.65.+k; 63.50.+x; 07.60.Rd 78.35.+c Brillouin and Rayleigh scattering; other light scattering (condensed matter) 62.65.+k Acoustical properties of solids 63.50.+x Vibrational states in disordered systems 07.60.Rd Visible and ultraviolet spectrometers YEAR: 2006
KEYWORDS:	silicon compounds, optical glass, Brillouin spectra, size effect, light interferometry, ultraviolet spectra

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