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BA Mathe,SR Naidoo,TE Derry,J D Comins
DST CoE SM & MPRI, School of Physics, University of the Witwatersrand
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Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Elastic, surface waves occurring in an ion-damaged region of diamond were studied using surface Brillouin scattering (SBS). By observing the Rayleigh-like mode of pure diamond, ion implanted diamonds to doses of 1×1016 ions/cm2 and 1.5×1016 ions/cm2 we noted that pristine diamond has the highest surface wave velocity of ≈ 12500 m/s, while the heavily implanted diamond has the lowest velocity of ≈12300 m/s. Elastodynamic Green’s functions simulation played an important role in predicting and confirming the spectra observed experimentally. This work has shown that a necessary condition for observing Brillouin spectrum is optically smooth surfaces even in transparent media. It has also been observed that the optical flatness of the surface, front and back plays a vital role in surface Brillouin scattering measurements.