We analyze the trapping potential of a setup of counter propagating optical tweezers and test the validity of the harmonic approximation in the dimension parallel to the trapping beam axis. While the dynamics of spherical droplets is very well described by a harmonic oscillator, we find that the trapping potential changes drastically for particles at resonance with the trapping laser, at so called Mie resonances. Our findings are discussed with regard to possible origins of this phenomenon.
In this contribution we present experiments used to control and characterize single optically trapped aerosol particles. These experiments include a counter-propagating optical tweezer, a feedback control mechanism to stabilize the particle in the trap and a two-angle optical scattering measurement to monitor the time-evolution of the particle size. Experimental setups and results are presented for these experiments.
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