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Liquid crystal emulsion micro-droplet WGM resonators

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Ježek, Jan
Pilát, Zdenek
Brzobohatý, Oto
Jonáš, Alexandr
Aas, Mehdi
Zemánek, Pavel

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We introduce tunable optofluidic microlasers based on optically stretched or thermally modified, dye-doped emulsion droplets of liquid crystals (LC) confined in a dual-beam optical trap. Droplets were created in microfluidic chips or by shaking. Optically trapped microdroplets emulsified in water and stained with fluorescent dye act as an active ultrahigh-Q optical resonant cavity hosting whispering gallery modes (WGMs). Tuning of the laser emission wavelength was achieved by a controlled deformation of the droplet shape using light-induced forces generated by dual-beam optical trap and by thermal changing of the order in the LC.

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Society of Photo-optical Instrumentation Engineers (SPIE)

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Physics

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Proceedings of SPIE - The International Society for Optical Engineering

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10.1117/12.2176025

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