Comparison of the efficiency of photophoretic trapping with different types of transverse beam profiles created using optical fiber

Anita Pahi; Ayan Banerjee

doi:10.1117/12.2669708

11 May 2023 Comparison of the efficiency of photophoretic trapping with different types of transverse beam profiles created using optical fiber

Anita Pahi, Ayan Banerjee

Author Affiliations +

Proceedings Volume 12638, Women in Optics and Photonics in India 2022; 1263806 (2023) https://doi.org/10.1117/12.2669708
Event: Women in Optics and Photonics in India, 2022, Bangalore, India

Conference Poster

Abstract

Trapping absorbing microscopic particles in air using photophoretic force has opened up an effective simple approach for three dimensional trapping in air. This trapping force is roughly 5 orders of magnitude higher than the radiation pressure force. Although there have been many works on trapping using structured light, work related to comparison of trapping force using various types of structured light do not exist. We have shown the correlation between the efficiency of photophoretic trapping with the structure in intensity profiles present in the trapping beam. Thus, we have created HG₀₀, HG₀₁and HG₀₂ mode in our experiment using different single mode optical fibers. Here, we show that trapping efficiency increases with increase in the number of modes in the transverse profile of the trapping beam. Trapping efficiency was measured using two parameters, threshold power and trapping force in the radial direction. The combination of dark and bright spots in the trapping beam indeed enhances the efficiency of photophoretic trapping due to its thermal origin. Our work will be helpful both in exploiting the fundamentals of photophoretic force and applications in aerosol studies and particle sorting away from surfaces.

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Anita Pahi and Ayan Banerjee "Comparison of the efficiency of photophoretic trapping with different types of transverse beam profiles created using optical fiber", Proc. SPIE 12638, Women in Optics and Photonics in India 2022, 1263806 (11 May 2023); https://doi.org/10.1117/12.2669708

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