Intracavity optical trapping of microscopic particles in a ring-cavity fiber laser

Fatemeh Kalantarifard, Parviz Elahi, Ghaith Makey, Onofrio M. Maragò, F. Ömer Ilday () and Giovanni Volpe ()
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Fatemeh Kalantarifard: Bilkent University
Parviz Elahi: Bilkent University
Ghaith Makey: Bilkent University
Onofrio M. Maragò: Istituto per i Processi Chimico-Fisici
F. Ömer Ilday: Bilkent University
Giovanni Volpe: Bilkent University

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Standard optical tweezers rely on optical forces arising when a focused laser beam interacts with a microscopic particle: scattering forces, pushing the particle along the beam direction, and gradient forces, attracting it towards the high-intensity focal spot. Importantly, the incoming laser beam is not affected by the particle position because the particle is outside the laser cavity. Here, we demonstrate that intracavity nonlinear feedback forces emerge when the particle is placed inside the optical cavity, resulting in orders-of-magnitude higher confinement along the three axes per unit laser intensity on the sample. This scheme allows trapping at very low numerical apertures and reduces the laser intensity to which the particle is exposed by two orders of magnitude compared to a standard 3D optical tweezers. These results are highly relevant for many applications requiring manipulation of samples that are subject to photodamage, such as in biophysics and nanosciences.

Date: 2019
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DOI: 10.1038/s41467-019-10662-7

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