Raman Scattering Enhancement Based on High-Pressure High-Temperature Diamonds†

We discuss the use of high-pressure high-temperature (HPHT) diamonds for the determination of trace amounts of various Raman active substances. The amount of the substances on the diamond surface required to measure the Raman spectra is one-to-three orders of magnitude smaller than the amount necessary to measure the spectra of the initial substance under the same experimental conditions. We investigate the dependence of the intensity of the Raman line of the substance on the size of the diamond particle and check if the Raman scattering intensity enhancement in diamond composites can be attributed to the whispering gallery mode resonance and the local field enhancement near the sharp diamond tip.