Droplet resonator based optofluidic microlasers

0434959 - ÚPT 2015 RIV US eng C - Conference Paper (international conference)
Kiraz, A. - Jonáš, A. - Aas, M. - Karadag, Y. - Brzobohatý, Oto - Ježek, Jan - Pilát, Zdeněk - Zemánek, Pavel - Anand, S. - McGloin, D.
Droplet resonator based optofluidic microlasers.
Laser Resonators, Microresonators, and Beam Control XVI (Proceedings of SPIE 8960). Bellingham: SPIE, 2014, 896015:1-7. ISSN 0277-786X.
[Laser Resonators, Microresonators, and Beam Control /16./. San Francisco (US), 03.02.2014-06.02.2014]
R&D Projects: GA ČR GPP205/11/P294; GA TA ČR TA03010642; GA MŠMT ED0017/01/01; GA MŠMT(CZ) LO1212
Institutional support: RVO:68081731
Keywords : Infrared lasers * Laser resonators * Lasers * Optical pumping * Optical trapping * Optical tweezers * Particles * Q switching * Resonators * Water
Subject RIV: BH - Optics, Masers, Lasers

We introduce tunable optofluidic microlasers based on active optical resonant cavities formed by optically stretched, dye-doped emulsion droplets confined in a dual-beam optical trap. To achieve tunable dye lasing, optically pumped droplets of oil dispersed in water are stretched by light in the dual-beam trap. Subsequently, resonant path lengths of whispering gallery modes (WGMs) propagating in the droplet are modified, leading to shifts in the microlaser emission wavelengths. We also report lasing in airborne, Rhodamine B-doped glycerolwater droplets which were localized using optical tweezers. While being trapped near the focal point of an infrared laser, the droplets were pumped with a Q-switched green laser. Furthermore, biological lasing in droplets supported by a superhydrophobic surface is demonstrated using a solution of Venus variant of the yellow fluorescent protein or E. Coli bacterial cells expressing stably the Venus protein. Our results may lead to new ways of probing airborne particles, exploiting the high sensitivity of stimulated emission to small perturbations in the droplet laser cavity and the gain medium.
Permanent Link: http://hdl.handle.net/11104/0241849