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Proceedings Paper

Photophoretic forces: A new enabler for robust single fiber-based optical traps in air
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Paper Abstract

We develop single fiber based optical tweezers employing photophoretic forces to trap absorbing particles exploiting the rotational motion displayed by the particles to be stably trapped radially. This implies that optical beams with a large off-axis intensity would prove to be more efficacious in trapping. Thus, we generate a pure Gaussian as well as a superposition of Gaussian and Hermite-Gaussian beam modes from a single optical fiber which is dual mode at our operating wavelength, and show that the latter is more efficacious in trapping by about 1.8 times than the former. Finally, we show that multimode fiber traps - which have even larger off-axis intensity distribution - are the most effective in trapping and manipulating absorbing particles.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110833A (9 September 2019); doi: 10.1117/12.2529859
Show Author Affiliations
Souvik Sil, Indian Institute of Science Education and Research Kolkata (India)
Ayan Banerjee, Indian Institute of Science Education and Research Kolkata (India)

Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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