Generation of pitch rotational torque wrench using two-beam optical tweezers on a birefringent particle

Muruga Lokesh; Rahul Vaippully; Basudev Roy

doi:10.1117/12.2592081

1 August 2021 Generation of pitch rotational torque wrench using two-beam optical tweezers on a birefringent particle

Muruga Lokesh, Rahul Vaippully, Basudev Roy

Proceedings Volume 11798, Optical Trapping and Optical Micromanipulation XVIII; 117981D (2021) https://doi.org/10.1117/12.2592081
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

3D Pitch rotational motion has been generated in spherical particles using holographic optical tweezers by maneuvering the laser spots to control the rotational motion. However, since the spherical particles, required to minimise complications due to the drag forces, are perfectly isotropic, a controllable torque cannot be applied with it. It is here that we trap birefringent particles in two tweezers beams and then change the depth of one of the beam foci controllably to generate a proper pitch rotational torque wrench. We also detect the rotation with our newly developed pitch rotational motion detection technique which could not be done conventionally on isotropic spherical particles.

Conference Presentation

Citation Download Citation

Muruga Lokesh, Rahul Vaippully, and Basudev Roy "Generation of pitch rotational torque wrench using two-beam optical tweezers on a birefringent particle", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 117981D (1 August 2021); https://doi.org/10.1117/12.2592081

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