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(a) Fourier transforms of particle height variation of a 4.74 μm particle due to Brownian motion. For comparison, the light source noise is also shown. Inset: height variations due to Brownian motion in time domain. (b) Fourier transform of the particle driven into oscillation with an applied potential (1 Vp.p. and 50 Hz), where the sharp peak at 50 Hz is due to the particle height oscillation. The inset shows the particle height oscillation in time domain.
