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Proceedings Paper

Temperature-induced tuning of emission spectra of liquid-crystal optical microcavities
Author(s): Pavel Zemánek; Zdeněk Pilát; Jan Ježek; Silvie Bernatová; Mehdi Aas; Alper Kiraz; Alexandr Jonáš
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Paper Abstract

Emulsion droplets of liquid crystals (LC) suspended in water and labeled with a suitable fluorescent dye can serve as active optofluidic microcavities, since the contrast of refractive index between the LC droplets and the surrounding aqueous medium allows excitation of whispering gallery modes (WGMs) in the droplets. In addition, such emulsion droplets can be also stably trapped in three-dimensions using optical tweezers which stabilizes the droplets while investigating their spectral characteristics. We explore various combinations of fluorescently dyed LC droplets and host liquid - surfactant systems and show that the WGM emission spectrum of an optically trapped LC droplet-based cavity can be largely and (almost) reversibly tuned by controlled changes of the ambient temperature that induce phase transitions in the LC droplets. Our results indicate feasibility of this approach for creating miniature tunable sources of coherent light.

Paper Details

Date Published: 23 December 2016
PDF: 9 pages
Proc. SPIE 10142, 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 101420F (23 December 2016); doi: 10.1117/12.2262495
Show Author Affiliations
Pavel Zemánek, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Zdeněk Pilát, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Jan Ježek, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Silvie Bernatová, Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic)
Mehdi Aas, Koç Univ. (Turkey)
Alper Kiraz, Koç Univ. (Turkey)
Alexandr Jonáš, Istanbul Technical Univ. (Turkey)


Published in SPIE Proceedings Vol. 10142:
20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Jarmila Müllerová; Dagmar Senderáková; Libor Ladányi; Ľubomír Scholtz, Editor(s)

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