Optical Trapping and Optical Micromanipulation XVII 2020
DOI: 10.1117/12.2566041
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Photoacoustics of single aerosol droplets immobilised by counter-propagating optical tweezers

Abstract: In this contribution we discuss the influence of relative humidity on photoacoustic measurements from both an experimental and theoretical perspective. We present a refined model of the photoacoustic (PA) signal that accounts for elevated particle temperatures and different levels of relative humidity. We use this new model together with the photoacoustic data collected with our photothermal single-particle spectrometer (PSPS) to retrieve the mass accommodation coefficients of water on organic aerosol particle… Show more

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Cited by 3 publications
(17 citation statements)
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References 83 publications
(142 reference statements)
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“…The two trapping arms (each ∼250 mW) are directed onto two facing aspherical lenses (79 mm, ASL10142 Thorlabs), which focus the beams at the center of the photoacoustic cell, creating a potential well to trap a particle. To enhance the stability of the optical trap, a feedback loop is introduced, which adjusts the respective powers in the two trapping arms. ,, This is achieved by monitoring the particle’s position using a quadrant photodiode (Hamamatsu, S5980) and changing the polarization of the trapping laser prior to the polarizing beamsplitter cube using an electro-optic modulator (EOM, 350-50-01, ConOptics), driven by a proportional–integral–derivative (PID) controller.…”
Section: Methodsmentioning
confidence: 99%
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“…The two trapping arms (each ∼250 mW) are directed onto two facing aspherical lenses (79 mm, ASL10142 Thorlabs), which focus the beams at the center of the photoacoustic cell, creating a potential well to trap a particle. To enhance the stability of the optical trap, a feedback loop is introduced, which adjusts the respective powers in the two trapping arms. ,, This is achieved by monitoring the particle’s position using a quadrant photodiode (Hamamatsu, S5980) and changing the polarization of the trapping laser prior to the polarizing beamsplitter cube using an electro-optic modulator (EOM, 350-50-01, ConOptics), driven by a proportional–integral–derivative (PID) controller.…”
Section: Methodsmentioning
confidence: 99%
“…To enhance the stability of the optical trap, a feedback loop is introduced, which adjusts the respective powers in the two trapping arms. 77,202,204 This is achieved by monitoring the particle's position using a quadrant photodiode (Hamamatsu, S5980) and changing the polarization of the trapping laser prior to the polarizing beamsplitter cube using an electro-optic modulator (EOM, 350-50-01, ConOptics), driven by a proportional−integral−derivative (PID) controller.…”
Section: Photothermal Single-particle Spectroscopy (Psps)mentioning
confidence: 99%
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