PhD Student Seminar - Probing Colloidal Hydrodynamics with Time-Multiplexed Optical Tweezers
Friday 16th October 2020
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Speaker: Tom Dixon
Title: Probing Colloidal Hydrodynamics with Time-Multiplexed Optical Tweezers
Abstract: Optical tweezers are a useful tool for biological manipulation, nano-scale sensing and investigations of colloidal dynamics. Within the latter category, many types of investigations are possible: driven colloidal behaviour, Brownian motion of colloidal collections or monitoring the synchronous motion of arrays of colloids. Each investigation requires a slightly different hardware configuration and different temporal and spatial resolution: many setups are mutually exclusive to each other. Here, I outline the development and validation of a generic time-sharing based optical tweezers platform, capable of performing a variety of colloidal experiments on the same hardware. I replicate several famous continuous-power experiments to demonstrate that this time-sharing method yields identical results, and conduct novel experiments as a trivial extension to demonstrate its utility.