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(a) Simplified schematic of the experimental setup. BPF: band-pass filter, LPF: long-pass filter, SPF: short-pass filter; EMCCD: electron-multiplying charged coupled device. (b1 and b2) Brownian motion histogram of a trapped particle. Position histograms were computed from 1000 EMCCD frames of a trapped 100 nm nanoparticle relative to the trap center along the x- and y-axes. The illumination power density was I = 5.1 mW/μm2.
