2011
DOI: 10.1364/oe.19.002204
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Continuously tunable microdroplet-laser in a microfluidic channel

Abstract: Abstract:This paper describes the generation and optical characterization of a series of dye-doped dropletbased optical microcavities with continuously decreasing radius in a microfluidic channel. A flow-focusing nozzle (FFN) generated the droplets (~ 21 μm in radius) using benzyl alcohol as the disperse phase and water as the continuous phase. As these drops moved down the channel, they dissolved, and their size decreased. The emission characteristics from the drops could be matched to the whispering gallery … Show more

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Cited by 119 publications
(128 citation statements)
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“…Within the studied range of droplet sizes (7.7-11.0 μm), FSR decreased withλ following an almost linear dependence. A similar spectral shift of the overall lasing gain profile was previously observed in lasing emulsion droplets [6,15] and explained by the size-dependence of the efficiency of light outcoupling from the droplets and the cross section of the lasing WGMs.…”
supporting
confidence: 81%
See 1 more Smart Citation
“…Within the studied range of droplet sizes (7.7-11.0 μm), FSR decreased withλ following an almost linear dependence. A similar spectral shift of the overall lasing gain profile was previously observed in lasing emulsion droplets [6,15] and explained by the size-dependence of the efficiency of light outcoupling from the droplets and the cross section of the lasing WGMs.…”
supporting
confidence: 81%
“…These WGMs are superimposed on a broad nonresonant background emission from the dye-doped thin solution layer formed on the cover glass during the experiment. In general, droplet WGMs can be characterized using radial, azimuthal, and angular mode numbers, and polarization (TE or TM) [6]. The WGMs that belong to the same mode family with identical radial mode number and polarization are indicated in Fig.…”
mentioning
confidence: 99%
“…The output laser characteristics depend on the composition of the gain medium and can thus be used as probes for the reaction. A number of published reports describe the use of microfabricated lasers, including a microfluidic dye laser [79] and a laser that could be tuned using digital microfluidics [80]. …”
Section: Droplet-based Micro and Nanotechnologymentioning
confidence: 99%
“…This is different for semiconductorbased WGM cavities where tuning of the cavity resonances is achievable by temperature-, field-or carrier-induced changes of the optical properties. [15][16][17][18] Liquid WGM resonators have been tuned by changing the size of the droplet resonators 19 or by mechanical size stretching. [20][21][22] But functional facility and reversibility are difficult to attain.…”
Section: Introductionmentioning
confidence: 99%