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Proceedings Paper

Whispering-gallery mode resonator sensors based on liquid droplets
Author(s): R. Zullo; A. Giorgini; S. Avino; P. Malara; P. De Natale; G. Gagliardi
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Paper Abstract

We present a simple and effective set-up to exploit the enhancement of passive optical cavities that are directly made from a liquid droplet. The optical resonances, corresponding to the so-called whispering-gallery modes (WGMs), are excited by a focused free-space beam edge-coupling scheme. Very narrow resonances are observed, both in the visible and near-infrared spectral regions, with quality (Q) factors ranging from 105 to 107 and beyond. Different methods for interrogation via frequency locking of a laser source to the WGM are shown. Locking of a diode laser to the equatorial modes of a liquid droplet resonator is demonstrated at 1560 nm and 663 nm. This approach makes high-performance optical sensing directly feasible in liquid samples with a number of advantages in view of their application for detection and quantification of bio-molecules.

Paper Details

Date Published: 22 April 2016
PDF: 6 pages
Proc. SPIE 9727, Laser Resonators, Microresonators, and Beam Control XVIII, 972713 (22 April 2016); doi: 10.1117/12.2230623
Show Author Affiliations
R. Zullo, Istituto Nazionale di Ottica (Italy)
A. Giorgini, Istituto Nazionale di Ottica (Italy)
S. Avino, Istituto Nazionale di Ottica (Italy)
P. Malara, Istituto Nazionale di Ottica (Italy)
P. De Natale, Istituto Nazionale di Ottica (Italy)
G. Gagliardi, Istituto Nazionale di Ottica (Italy)

Published in SPIE Proceedings Vol. 9727:
Laser Resonators, Microresonators, and Beam Control XVIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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