7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Ion dose effect on sound velocity in ion-implanted CVD diamond studied using surface Brillouin scattering

9 Jul 2014, 15:00
D Les 201

D Les 201

Oral Presentation Track A - Division for Physics of Condensed Matter and Materials DPCMM1


Dr Bhekumusa Mathe (University of the Witwatersrand)

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Main supervisor (name and email)<br>and his / her institution

BA Mathe,SR Naidoo,TE Derry,J D Comins
DST CoE SM & MPRI, School of Physics, University of the Witwatersrand

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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.

Primary author

Mr Isaac Motochi (University of the Witwatersrand)


Dr Bhekumusa Mathe (University of the Witwatersrand) Prof. Darrell Comins (University of the Witwatersrand) Dr Mervin Naidoo (University of Witwatersrand) Prof. Trevor Derry (University of the Witwatersrand)

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