Versatile optofluidic ring resonator lasers based on microdroplets

Title
Versatile optofluidic ring resonator lasers based on microdroplets
Authors
이원석Yunhan LuoQiran ZhuXudong Fan
Issue Date
2011-09
Publisher
Optics express
Citation
VOL 19, NO 20-19674
Abstract
We develop a novel nL-sized microdroplet laser based on the capillary optofluidic ring resonator (OFRR). The microdroplet is generated in a microfluidic channel using two immiscible fluids and is subsequently delivered to the capillary OFRR downstream. Despite the presence of the high refractive index (RI) carrier fluid, the lasing emission can still be achieved for the droplet formed by low RI solution. The lasing threshold of 1.54 mu J/mm(2) is achieved, >6 times lower than the state-of-the-art, thanks to the high Q-factor of the OFRR. Furthermore, the lasing emission can be conveniently coupled into an optical fiber. Finally, tuning of the lasing wavelength is achieved via highly efficient fluorescence resonance energy transfer processes by merging two different dye droplets in the microfluidic channel. Versatility combined with improved lasing characteristics makes our OFRR droplet laser an attractive platform for high performance optofluidic lasers and bio/chemical sensing with small sample volumes.
URI
http://pubs.kist.re.kr/handle/201004/71103
ISSN
1094-4087
Appears in Collections:
KIST Publication > Article
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