Journal
LIQUID CRYSTALS
Volume 43, Issue 13-15, Pages 1937-1950Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2016.1221151
Keywords
Liquid-crystal droplets; optical cavities; lasers; whispering-gallery modes; cholesteric lasers
Funding
- European Community [627274]
- Slovenian Research Agency [P1-0099, PR-01557, J1-9728, J1-3612]
- Directorate-General for Research and Innovation [627274]
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The use of liquid-crystal droplets as optical microcavities and lasers is reviewed and possible applications are discussed. Liquid-crystal droplets are prepared by simple methods that enable scalable production since their internal structure is formed by self-assembly. Light is trapped in droplets due to total internal reflection on the surface due to refractive index mismatch or because of a photonic bandgap structure in cholesteric liquid crystals (CLCs). Light confinement gives rise to a variety of optical modes and by employing a fluorescent dye end external optical pumping, lasing can be achieved. Liquid-crystal-droplet cavities are largely tunable by applying an electric field or a temperature change. Such cavities can be used as temperature and chemical sensors, and tunable light sources and filters in future integrated soft photonic circuits. [GRAPHICS] .
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