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
20m
D Les 201

D Les 201

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

Speaker

Dr Bhekumusa Mathe (University of the Witwatersrand)

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

N/A

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

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Abstract content <br> &nbsp; (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.

Primary author

Mr Isaac Motochi (University of the Witwatersrand)

Co-authors

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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