Measurement of Van der Waals force using optical tweezers

Avijit Kundu; Shuvojit Paul; Soumitro Banerjee; Ayan Banerjee

doi:10.1117/12.2529199

9 September 2019 Measurement of Van der Waals force using optical tweezers

Avijit Kundu, Shuvojit Paul, Soumitro Banerjee, Ayan Banerjee

Proceedings Volume 11083, Optical Trapping and Optical Micromanipulation XVI; 110832G (2019) https://doi.org/10.1117/12.2529199
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Surface effects are crucial in several mesoscopic phenomena, especially those concerning biological entities. Here we determine the effects of Van der Waals forces at relatively long range ( 80 nm) by optically trapping a probe particle close to a large silica particle and modulating the spatial position of the probe employing oscillating optical tweezers. This method has greater signal-to-noise in the experimentally measured probe-response as compare to that obtained from measurements of Brownian fluctuations. We quantify the H-value experimentally by analyzing the amplitude response of a single trapped particle in comparison to numerically expected results by employing chi-square fitting, and obtain good agreement with the known H-value for the system.

Conference Presentation

Citation Download Citation

Avijit Kundu, Shuvojit Paul, Soumitro Banerjee, and Ayan Banerjee "Measurement of Van der Waals force using optical tweezers", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110832G (9 September 2019); https://doi.org/10.1117/12.2529199

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