Special Section: Selected Papers from the First Joint Israeli-Turkish Workshop on Nanophotonics

Single glycerol/water microdroplets standing on a superhydrophobic surface: Optical microcavities promising original applications

[+] Author Affiliations
Alper Kiraz

Koc¸ University

Mehmet A. Dundar

Koc¸ Univesity

Adem L. Demirel, Sultan Doganay, Adnan Kurt

Koc¸ University

Alphan Sennaroglu

Koc University

Mehdi Y. Yu¨ce

Koc¸ University

J. Nanophoton. 1(1), 011655 (October 15, 2007). doi:10.1117/1.2805365
History: Received June 15, 2007; Revised August 30, 2007; Accepted September 2, 2007; October 15, 2007; Online October 15, 2007
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Abstract

Glycerol/water microdroplets take almost spherical shapes when standing on a superhydrophobic surface. Hence they are suitable to function as optical microcavities. Using Rhodamine B doped water microdroplets, large spectral tunability of the whispering gallery modes (WGMs) (>5 nm) was observed. Tunability was achieved by evaporation/condensation in a current controlled mini humidity chamber. Experiments revealed a mechanism stabilizing the volume of these microdroplets with femtoliter resolution. The mechanism relied on the interplay between the condensation rate that was kept constant and the size dependent laser induced heating. The radii of individual water microdroplets (>5 μm) stayed within a few nanometers during long time periods (several minutes). By blocking the laser excitation for 500 msec, the stable volume of individual microdroplets were changed stepwise. Laser emission was also observed from Rhodamine B doped glycerol/water microdroplets using a pulsed, frequency-doubled Nd:YAG laser (λ=532 nm) as the excitation source. The observed largely tunable WGMs and laser emission can pave way for novel applications in optical communication systems. Besides due to the sensitivity of the WGMs to the size and shape of the microdroplets, the results can find applications in characterizing superhydrophobic surfaces and investigating liquid-solid surfaces.

© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Alper Kiraz ; Mehmet A. Dundar ; Adem L. Demirel ; Sultan Doganay ; Adnan Kurt, et al.
"Single glycerol/water microdroplets standing on a superhydrophobic surface: Optical microcavities promising original applications", J. Nanophoton. 1(1), 011655 (October 15, 2007). ; http://dx.doi.org/10.1117/1.2805365


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