Nanoparticle-based applications require increasingly sensitive screening tools, necessitating single-particle, multi-parameter analysis techniques in the native liquid environment. In this work, we present a laser-scanning camera using acousto-optic deflectors and a single-photon counting module. By scanning a highly focused laser beam (532 nm) across a grid of pixels, and by detecting the associated emitted photons with high sensitivity, fluorescent nanoparticles of 100 nm and below can be imaged at frame rates up to 12 kHz.
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