P2N group reports changes in phonon propagation in ultra-thin silicon membranes

Using a technique known as angle-resolved Brillouin scattering spectroscopy, the researchers were able to clock the speed at which confined phonons propagate through free-standing silicon membranes from 400 nm down to 7.8 nm thick. In this non-destructive technique, laser light of a known frequency is applied to the membrane surface; this light is then scattered from the natural vibrations or phonons moving through the sample, with a minute change in frequency. By measuring this tiny change in frequency, and associating it with the correct direction of scattering, the velocity of the phonons can be determined.

More information here:

http://www.icn.cat/~p2n/uncategorized/p2n-group-reports-changes-in-phonon-propagation-in-ultra-thin-silicon-membranes.html

 

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