Some facets of out-of-plane rotations in optical tweezers: towards classical and quantum applications.

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Name of the Speaker: C M Lokesh (EE18D750)
Guide: Dr. Anil Prabhakar
Co-Guide: Dr. Basudev Roy
Venue/Online meeting link: ESB-244 (Seminar Hall)
Date/Time: 16th March 2023, 11am

Controlled manipulation of microparticles with optical tweezers is a sensitive tool for observing, detecting, and studying the properties of local environments in fields such as biology and soft matter. The translational and rotational degrees of freedom of a probe particle each store unique information about the local environment. Scientists use several techniques, such as optical tweezers, magnetic tweezers, and microscope imaging tools, to control and track the position of particles. However, the out-of-plane rotations of particles, in particular, have not been extensively studied. In this work, I present techniques to generate and detect out-of-plane rotations induced by single and dual beam traps. Additionally, I demonstrate the use of out-of-plane rotations to probe the mechanical properties of air-water interfaces and generate accelerated self-assembly at the interface using thermal flows. This work provides valuable insights and information about various systems in the fields of biology, soft matter, and others.