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1 August 2021 Ultrafast viscosity measurement with ballistic optical tweezers
Alex Terrasson, Lars Madsen, Muhammad Waleed, Catxere Casacio, Alexander Stilgoe, Michael Taylor, Warwick Bowen
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Proceedings Volume 11798, Optical Trapping and Optical Micromanipulation XVIII; 117980E (2021) https://doi.org/10.1117/12.2595321
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Viscosity is an important property of out-of-equilibrium systems such as active biological materials and driven non-Newtonian fluids. Noninvasive viscosity measurements typically require integration times of seconds. Here we demonstrate measurement speeds reaching twenty microseconds, with uncertainty dominated by thermal molecular collisions for the first time. We achieve this using the instantaneous velocity of a trapped particle in an optical tweezer, combined with a structured-light detection system. This opens a pathway to new discoveries in out-of-equilibrium systems.
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Alex Terrasson, Lars Madsen, Muhammad Waleed, Catxere Casacio, Alexander Stilgoe, Michael Taylor, and Warwick Bowen "Ultrafast viscosity measurement with ballistic optical tweezers", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 117980E (1 August 2021); https://doi.org/10.1117/12.2595321
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KEYWORDS
Optical tweezers
Optical testing
Ultrafast measurement systems
Ultrafast phenomena
Particles
Medicine
Microfluidics
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