Surfactant sensing based on whispering-gallery-mode lasing in liquid-crystal microdroplets

Humar, Matjaž; Muševič, Igor

doi:10.1364/oe.19.019836

Cited by 101 publications

(71 citation statements)

References 23 publications

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“…Tuneable nematic microresonators have been reported by Humar et al [46,47] in emulsions of microdroplets of the nematic LC E12 in PDMS. Because the surface anchoring of E12 at the PDMS interface is homeotropic, each nematic droplet adopts a radial configuration with a topological hedgehog defect in the centre (figure 7a-c).…”

Section: Optical Microresonators and Microlasers Based On Liquid-crysmentioning

confidence: 96%

Nematic colloids, topology and photonics

Muševič

2013

Phil. Trans. R. Soc. A.

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We review and discuss recent progress in the field of nematic colloids, with an emphasis on possible future applications in photonics. The role of the topology is described, based on experimental manipulations of the topological defects in nematic colloids. The topology of the ordering field in nematics provides the forces between colloidal particles that are unique to these materials. We also discuss recent progress in the new field of active microphotonic devices based on liquid crystals (LCs), where chiral nematic microlasers and tuneable nematic microresonators are just two of the recently discovered examples. We conclude that the combination of topology and microphotonic devices based on LCs provides an interesting platform for future progress in the field of LCs.

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Section: Optical Microresonators and Microlasers Based On Liquid-crysmentioning

confidence: 96%

Nematic colloids, topology and photonics

Muševič

2013

Phil. Trans. R. Soc. A.

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“…The WGM lasing in the dye-doped nematic droplets has been demonstrated in Ref. [145], with the surface director orientation being continuously varied from planar to homeotropic. High sensitivities of LCs to the external fields allow for controlling their optical properties with the electric fields applied.…”

Section: Lasing Dropletsmentioning

confidence: 99%

Optically pumped mirrorless lasing. A Review. Part II. Lasing in photonic crystals and microcavities

Dudok¹,

Nastishin²

2014

Ukr. J. Phys. Opt.

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Abstract. This article is a second part of the review on optically pumped mirrorless lasing. Consideration of random lasing presented in the first part [Nastishin Yu A and Dudok T H, 2013. Ukr. J. Phys. Opt.] is now followed by analysis of the literature on the lasing in photonic structures, which is mainly focussed on dye-doped cholesteric liquid crystals and microcavities, including liquid-crystal microdroplets.

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“…This value is one to two orders of magnitude larger compared to solid-state microresonators. Humar and Musevic have demonstrated in several publications 2,3,9 , that the WGMs in NLC microdroplets can be tuned by temperature an mechanical strain, which makes them interesting devices for sensors. Besides tuning of WGMs by external electric field, temperature and strain, they have also demonstrated lasing from WGMs 3 , which is quite sensitive to the chemical constitution of their environment.…”

Section: Tunable Nematic Liquid Crystal Wgm Microlasersmentioning

confidence: 99%

Self-assembled liquid-crystal microlasers, microresonators, and microfibres

et al. 2014

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When liquid crystals are dispersed in an immiscible fluid, microdroplets of liquid crystal are spontaneously formed in a fraction of a second. They have optically anisotropic internal structure, which is determined by the ordering of liquid crystal molecules at the interface. Spherical droplets of a nematic liquid crystal can function as whispering-gallery-mode microresonators with an unprecedented width of wavelength tunability by an electric field. WGM pulsed lasing in dyedoped nematic microdroplets is sensitive to strain, temperature and presence of molecules that change molecular orientation at the interface. Omnidirectional 3D lasing was demonstrated in droplets of chiral nematic liquid crystals that form 3D Bragg-onion resonators. We present recent progress in this field, including electric tuning of 3D lasing from chiral nematic droplets and self-assembly of ferroelectric smectic-C* microdroplets with the onion-Bragg structure. We show that anisotropic fibres could be self-assembled from smectic liquid crystals.

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Surfactant sensing based on whispering-gallery-mode lasing in liquid-crystal microdroplets

Cited by 101 publications

References 23 publications

Nematic colloids, topology and photonics

Nematic colloids, topology and photonics

Optically pumped mirrorless lasing. A Review. Part II. Lasing in photonic crystals and microcavities

Self-assembled liquid-crystal microlasers, microresonators, and microfibres

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