Abstract
We report on observation of confined acoustic phonons in CuCl nanocrystals by means of a site-selective nanosecond pump-and-probe method. The nanocrystal-size-dependent energy intervals between the zero-phonon line and phonon side bands in the hole-burning spectra coincide with the calculated energies of confined acoustic phonons in nanometer-size elastic spheres. We conclude that the phonon side bands are due to confined acoustic phonons in CuCl nanocrystals. The observed confined acoustic phonon mode depends on the elastic constants of the surrounding matrices, glass and NaCl. The persistent spectral hole-burning phenomenon serves as the observation of the zero-phonon line and phonon side bands.
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