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Tunable optofluidic microlasers based on optically stretched emulsion droplets
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SYSNO ASEP 0422303 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Tunable optofluidic microlasers based on optically stretched emulsion droplets Author(s) Aas, M. (TR)
Jonáš, Alexandr (UPT-D) RID, SAI, ORCID
Kiraz, A. (TR)
Brzobohatý, Oto (UPT-D) RID, ORCID, SAI
Ježek, Jan (UPT-D) RID, ORCID, SAI
Pilát, Zdeněk (UPT-D) RID, SAI, ORCID
Zemánek, Pavel (UPT-D) RID, SAI, ORCIDNumber of authors 7 Source Title Optical Trapping and Optical Micromanipulation X (Proceedings of SPIE Vol. 8810). - Bellingham : SPIE, 2013 - ISSN 0277-786X Pages 88101y:1-12 Number of pages 12 s. Publication form Print - P Action Optical Trapping and Optical Micromanipulation /10./ Event date 25.08.2013-29.08.2013 VEvent location San Diego Country US - United States Event type WRD Language eng - English Country US - United States Keywords lasers ; optical trapping ; water ; wavelength tuning Subject RIV BH - Optics, Masers, Lasers R&D Projects GPP205/11/P294 GA ČR - Czech Science Foundation (CSF) TA03010642 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UPT-D - RVO:68081731 UT WOS 000328460400031 EID SCOPUS 84889602625 DOI 10.1117/12.2024252 Annotation We introduce tunable optofluidic microlasers based on optically stretched, dye-doped emulsion droplets confined in a dual-beam optical trap. Optically trapped microdroplets of oil emulsified in water and stained with fluorescent dye act as active ultrahigh-Q optical resonant cavities hosting whispering gallery modes (WGMs) which enable dye lasing with low threshold pump powers. In order to achieve tunable dye lasing, the droplets are pumped with a pulsed green laser beam and simultaneously stretched by light in the dual-beam trap. For a given stretching power, the magnitude of the droplet deformation is dictated by the interfacial tension between the droplet and the host liquid which is adjustable by adding surfactants. Increase of power of the dual-beam trap causes a directly proportional change of the droplet stretching deformation. Subsequently, resonant path lengths of different WGMs propagating in the droplet are modified, leading to shifts in the corresponding microlaser emission wavelenghts. Using this technique, we present all-optical, almost reversible spectral tuning of the lasing WGMs and show that the direction of wavelength tuning depends on the position of the pump beam focus on the droplet, consistent with the deformation of originally spherical droplet towards a prolate spheroid. In addition, we study the effects of changes of the droplet and immersion medium temperature on the spectral position of lasing WGMs and demonstrate that droplet heating leads to red-tuning of the droplet lasing wavelength. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2014
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