7-11 July 2014
Africa/Johannesburg timezone
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Ion dose effect on sound velocity in ion-implanted CVD diamond studied using surface Brillouin scattering

Presented by Dr. Bhekumusa MATHE on 9 Jul 2014 from 15:00 to 15:20
Type: Oral Presentation
Session: DPCMM1
Track: Track A - Division for Physics of Condensed Matter and Materials

Abstract

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.

Award

No

Level

N/A

Supervisor

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

Paper

No

Place

Room: D Les 201


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