Impulsively-Driven Motion of 100 nm Particles in Hollow Core Photonic Crystal Fibre at Atmospheric Pressure

Chakraborty S, Wong GK, Russell PSJ, Joly NY (2025)

Publication Type: Conference contribution

Publication year: 2025

Publisher: Institute of Electrical and Electronics Engineers Inc.

Conference Proceedings Title: 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025

Event location: Munich, DEU

ISBN: 9798331512521

DOI: 10.1109/CLEO/EUROPE-EQEC65582.2025.11110880

Abstract

Hollow-core photonic crystal fibre (HC-PCF) provides a convenient means of optically trapping and transporting dielectric particles [1] and even cold atoms [2] over long distances. The particles are trapped by gradient forces in the transverse plane, and in the axial direction strong gradient traps can be formed, for sub-λ/2 particles, at field maxima in the interference pattern between counter-propagating beams. Introducing a frequency difference causes the fringes to move, creating a particle conveyor belt at low air pressure [3,4]. Here we study this phenomenon at atmospheric pressure, when viscous drag is strong. Light from a λ = 1064 nm CW Nd:YAG laser is launched into both ends of a single-ring HC-PCF (core diameter 44 µm), resulting in a fringe spacing of 532 nm, which is large enough to create axial traps for the 100 nm silica particles used in the experiment. One of the trapping beams is phase-modulated (using a Pockels cell) with a sawtooth waveform of amplitude 2π and frequency fs, resulting in an effective fringe velocity vf = fsλ/2. The particle velocity vp < vf oscillates as it is momentarily captured and accelerated by each passing fringe, followed by release and deceleration by viscous forces (Fig. 1(a)).

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE)

How to cite

APA:

Chakraborty, S., Wong, G.K., Russell, P.S.J., & Joly, N.Y. (2025). Impulsively-Driven Motion of 100 nm Particles in Hollow Core Photonic Crystal Fibre at Atmospheric Pressure. In 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025. Munich, DEU: Institute of Electrical and Electronics Engineers Inc..

MLA:

Chakraborty, Soumya, et al. "Impulsively-Driven Motion of 100 nm Particles in Hollow Core Photonic Crystal Fibre at Atmospheric Pressure." Proceedings of the 2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025, Munich, DEU Institute of Electrical and Electronics Engineers Inc., 2025.

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