Direct Sensing in Liquids Using Whispering‐Gallery‐Mode Droplet Resonators | Zendy

Avino Saverio | Zendy; Krause Anika | Zendy; Zullo Rosa | Zendy; Giorgini Antonio | Zendy; Malara Pietro | Zendy; De Natale Paolo | Zendy; Loock Hans Peter | Zendy; Gagliardi Gianluca | Zendy

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Direct Sensing in Liquids Using Whispering‐Gallery‐Mode Droplet Resonators

Author(s) -

Avino Saverio,

Krause Anika,

Zullo Rosa,

Giorgini Antonio,

Malara Pietro,

De Natale Paolo,

Loock Hans Peter,

Gagliardi Gianluca

Publication year - 2014

Publication title -

advanced optical materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.89

H-Index - 91

ISSN - 2195-1071

DOI - 10.1002/adom.201400322

Subject(s) - whispering gallery wave , resonator , materials science , surface tension , resonance (particle physics) , volume (thermodynamics) , whispering gallery , drop (telecommunication) , optics , optical cavity , laser , optoelectronics , nanotechnology , computer science , telecommunications , physics , particle physics , quantum mechanics

Liquid droplets suspended by the tip of a thin wire , a glass capillary, or a needle form high‐Q optical resonators, thanks to surface tension. Under gravity equilibrium conditions, the maximum drop diameter is approximately 1.5 mm for paraffin oil (volume ∼ 0.5 μL) using, for instance, a silica fiber with 250 μm thickness. Whispering gallery modes are excited by a free‐space near‐infrared laser that is frequency locked to the cavity resonance. The droplet cavity serves as a miniature laboratory for sensing of chemical species and particles.

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