Abstract
The light scattering properties of boron doped diamond film have been investigated by Raman spectroscopy using ultraviolet (325 and 244 nm) and visible (514 nm) excitations. The relative intensity of electronic Raman scattering to phonon scattering decreases with the increase of the excitation energies, while the Fano-type interference between discrete phonon scattering and continuum electronic scattering becomes weak and phonon scattering peak shifts to higher Raman shift. The decoupling zone center phonon frequency is estimated based on the ultraviolet (UV) Raman scattering; the result indicates that boron induced phonon “softening” in diamond is smaller than that estimated based on the visible Raman spectra. The two broad peaks located at about 500 and 1200 cm−1 on the visible Raman spectrum cannot be detected when it is excited by the UV lasers.
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