Direct Sensing in Liquids Using Whispering‐Gallery‐Mode Droplet Resonators. Issue 12 (17th September 2014)

• Record Type: Journal Article
• Authors: Avino, Saverio; Krause, Anika; Zullo, Rosa; Giorgini, Antonio; Malara, Pietro; De Natale, Paolo; Loock, Hans Peter; Gagliardi, Gianluca
• Is Part Of: Advanced optical materials. Volume 2:Issue 12(2014:Dec.)
• Page Start: 1155
• Page End: 1159
• Publication Date: 2014-09-17
• Subjects: Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201400322
• Languages: English
• ISSNs: 2195-1071

Abstract

<abstract abstract-type="graphical" xml:lang="en" id="adom201400322-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <bold>Liquid droplets suspended by the tip of a thin wire</bold>, 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. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgh2sx29x92" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>