Simulation of particle dynamics in the evanescent field of an ultrathin optical fiber

Pramitha Praveen Kamath; Viet Giang Truong; Souvik Sil; Síle Nic Chormaic

doi:10.1117/12.2675705

5 October 2023 Simulation of particle dynamics in the evanescent field of an ultrathin optical fiber

Pramitha Praveen Kamath, Viet Giang Truong, Souvik Sil, Síle Nic Chormaic

Proceedings Volume 12649, Optical Trapping and Optical Micromanipulation XX; 126490H (2023) https://doi.org/10.1117/12.2675705
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Janus particles (JPs) are composite particles of two or more parts with distinct chemical and physical characteristics. As the current methods of manipulation rely on chemical reactions or thermal gradients, they are restricted by the carrier fluid’s content and characteristics. In addition, the high absorbance of the mettalo-dielectric JPs causes strong repulsion from the optical traps. This poses practical challenges in manipulating them effectively. To tackle such limitations, we propose manipulating JPs by the optical forces in the evanescent field of a nanofiber. The field locks the JP to the nanofiber, restricting motion in the radial direction while allowing propulsion along the propagation direction of the laser beam. This work theoretically examines a JP (here, silica microspheres concentric half-dome caps of titanium and gold) in the evanescent field of a nanofiber. The various effects of the force and torques are discussed.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Pramitha Praveen Kamath, Viet Giang Truong, Souvik Sil, and Síle Nic Chormaic "Simulation of particle dynamics in the evanescent field of an ultrathin optical fiber", Proc. SPIE 12649, Optical Trapping and Optical Micromanipulation XX, 126490H (5 October 2023); https://doi.org/10.1117/12.2675705

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