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Whispering-gallery mode resonator sensors based on liquid droplets

  Articoli su Riviste JCR/ISI  (anno 2016)

Autori:  Zullo R., Giorgini A., Avino S., Malara P., De Natale P., Gagliardi G

Affiliazione Autori:  Consiglio Nazionale Delle Ricerche, Istituto Nazionale di Ottica (INO), Comprensorio A. Olivetti, via Campi Flegrei 34, Pozzuoli (Naples), 80078, Italy; Consiglio Nazionale Delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, Firenze, 50125, Italy

Riassunto:  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.

Rivista/Giornale:  
Volume n.:        Pagine da: 972713-1  a: 972713-6
DOI: 10.1117/12.2230623


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