Brillouin observation of bulk and confined acoustic waves in silica microspheres

Lim, H. S.; Kuok, M. H.; Ng, S. C.; Wang, Z. K.
May 2004
Applied Physics Letters;5/24/2004, Vol. 84 Issue 21, p4182
Academic Journal
Brillouin scattering from loose silica microspheres has been investigated as a function of their diameter (140 nm to 4 μm). The measured linear dependence of the confined acoustic mode frequencies on the inverse sphere diameters accords well with Lamb’s theory. Bulk acoustic modes are also observed in the larger microspheres, suggesting that the limiting size of a particle for these modes to be observable is about three times their wavelength. Internal consistency in the analyses of the bulk and confined mode data shows the validity of this Brillouin technique in the evaluation of the elastic properties of microspheres. Additionally it also affords a means of sizing the diameters of microspheres. © 2004 American Institute of Physics.


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