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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.
Oliver R. Reich,Grégory David, andRuth Signorell
"Anharmonic aerosol particle dynamics at Mie resonances in modulated counter-propagating optical tweezers", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 1179827 (1 August 2021); https://doi.org/10.1117/12.2593583
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Oliver R. Reich, Grégory David, Ruth Signorell, "Anharmonic aerosol particle dynamics at Mie resonances in modulated counter-propagating optical tweezers," Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 1179827 (1 August 2021); https://doi.org/10.1117/12.2593583