Phase-adaptive cooling of fringe-trapped nanoparticles at room temperature in hollow-core photonic crystal fiber

Chakraborty S, Wong GK, Kumar P, Nam H, Genes C, Joly N (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Physical Review Research American Physical Society

Book Volume: 7

Article Number: 043301

Journal Issue: 4

DOI: 10.1103/cg5v-lpjy

Abstract

Active feedback cooling of levitated dielectric particles is a pivotal technique for creating ultrasensitive sensors and probing fundamental physics. Here, we experimentally demonstrate phase-adaptive feedback cooling of silica nanoparticles optically trapped in standing-wave potential formed by two co-linearly polarized counterpropagating diffraction-free guided modes in a hollow-core photonic crystal fiber at room temperature. Unlike standard laser intensity- or Coulomb force-based feedback, our approach modulates the relative optical phase between the counterpropagating fiber-guided fundamental modes proportionally to the particle's axial momentum. This generates a Stokes-like dissipative force that effectively damps the center-of-mass motion without introducing excess recoil heating and can also work with uncharged particles. At 2 mbar air pressure, the axial center-of-mass temperature of a 195 nm silica particle is reduced by half upon application of the feedback and to 58.6 K at 0.5 mbar. The measured mechanical spectra agree well with our analytical model, validating the cooling mechanism. We envision that this approach will open up pathways toward long-range, coherent control of mesoscopic particles inside hollow-core fibers, offering a fiber-integrated versatile platform for future quantum manipulation.

Authors with CRIS profile

Soumya Chakraborty Professur für Experimentalphysik (Photonik) Hyunjun Nam Professur für Experimentalphysik (Photonik) Nicolas Joly Professur für Experimentalphysik (Photonik)

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., Kumar, P., Nam, H., Genes, C., & Joly, N. (2025). Phase-adaptive cooling of fringe-trapped nanoparticles at room temperature in hollow-core photonic crystal fiber. Physical Review Research, 7(4). https://doi.org/10.1103/cg5v-lpjy

MLA:

Chakraborty, Soumya, et al. "Phase-adaptive cooling of fringe-trapped nanoparticles at room temperature in hollow-core photonic crystal fiber." Physical Review Research 7.4 (2025).

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