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We give a detailed description of a novel method for timeresolved experiments on single non-luminescent nanoparticles. The method is based on the combination of pump-probe spectroscopy and a commonpath interferometer. In our interferometer, probe and reference arms are separated in time and polarization by a birefringent crystal. The interferometer, fully described by an analytical model, allows us to separately detect the real and imaginary contributions to the signal. We demonstrate the possibilities of the setup by time-resolved detection of single gold nanoparticles as small as 10 nm in diameter, and of acoustic oscillations of particles larger than 40 nm in diameter.

A common-path interferometer for time-resolved and shot-noise-limited detection of single nanoparticles