Tuneable ferroelectric liquid crystal microlaser

Ryzhkova, A. V.; Pratibha, R.; Nikkhou, Maryam; Muševič, Igor

doi:10.1080/02678292.2019.1700567

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…Shortly afterward, the same group reported tuning of the lasing emission spectra of nematic LC emulsion droplets by changing the concentration of the surfactant in the host liquid and reversible thermally induced tuning of lasing Bragg-onion cavities formed by cholesteric LC droplets . Recently, ferroelectric smectic LC droplets suspended in a solution of a fluorinated polymer and pumped with a focused pulsed laser beam were shown to sustain lasing emission switchable and tunable by an external DC electric field. , While these studies demonstrated feasibility of creating tunable microlasers from droplets of various types of dye-doped LCs, they did not address the issue of flexible position control and spatial manipulation of such microscopic sources of laser light. Moreover, in experiments with electric-field tuning of lasing LC microcavities, the use of host media based on solid or liquid polymers significantly hampers in situ modifications of the cavity’s ambient chemical properties and, therefore, restricts the range of possible applications of such lasing microcavities.…”

Section: Introductionmentioning

confidence: 99%

Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field

Jonáš

Pilát

Ježek

et al. 2021

ACS Appl. Mater. Interfaces

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Liquid crystal microdroplets with readily adjustable optical properties have attracted considerable attention for building reconfigurable optofluidic microsystems for sensing, imaging, and light routing applications. In this quest, development of active optical microcavities serving as versatile integrated sources of coherent light and ultra-sensitive environmental sensors has played a prominent role. Here, we study transportable optofluidic microlasers reversibly tunable by an external electric field, which are based on fluorophore-doped emulsion droplets of radial nematic liquid crystals manipulated by optical tweezers in microfluidic chips with embedded liquid electrodes. Full transparency of the electrodes formed by a concentrated electrolyte solution allows for applying an electric field to the optically trapped droplets without undesired heating caused by light absorption. Taking advantage of independent, precise control over the electric and thermal stimulation of the lasing liquid crystal droplets, we characterize their spectral tuning response at various optical trapping powers and study their relaxation upon a sudden decrease in the trapping power. Finally, we demonstrate that sufficiently strong applied electric fields can induce fully reversible phase transitions in the trapped droplets even below the bulk melting temperature of the used liquid crystal. Our observations indicate viability of creating electrically tunable, optically transported microlasers that can be prepared on-demand and operated within microfluidic chips to implement integrated microphotonic or sensing systems.

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Section: Introductionmentioning

confidence: 99%

Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field

Jonáš

Pilát

Ježek

et al. 2021

ACS Appl. Mater. Interfaces

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“…Electro-optic and temperature-dependent properties of liquid crystals (LCs) have been exploited for a long time in applications that range between traditional displays, high-resolution devices for communications, microwave and terahertz devices to biological and chemical sensors [1][2][3][4][5][6][7][8]. Either in bulk, or geometrically confined, LC mesogens exhibit interesting chemical and physical properties that could lead to several innovations in devices and processes.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal droplets under extreme confinement probed by a multiscale simulation approach

2021

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In this work, we computationally investigate liquid crystal (LC) droplets in the size range 0.03-1 μm, confined within shells of combined anchoring conditions. Two different types of surface were defined to promote homeotropic and planar degenerate anchoring, respectively. We identified the LC behaviour within the nanoscale droplets using a bespoke multiscale simulation approach. To study 30 nm droplets, we used coarse grained simulations within the dissipative particle dynamics formalism; to study 0.1 μm and larger droplets, we used a finite element method based on the Landau-de Gennes theory. Good agreement between the two methods was observed in our prior analysis and was confirmed in the present work. We explicitly study droplets of size 0.1 and 1 μm by using continuum mechanics calculations. Our results for the largest droplet are consistent with those available in the literature, suggesting that the extension to smaller droplets presented here is realistic, and therefore can be helpful for innovations in which device intensification could be achieved using LC nanodroplets.

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Crystallization-driven tuneable lasing of perylene doped into the nematic liquid crystal

Szukalska,

Zak,

Chrzumnicka

et al. 2024

Giant

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Tuneable ferroelectric liquid crystal microlaser

Cited by 6 publications

References 28 publications

Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field

Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field

Liquid crystal droplets under extreme confinement probed by a multiscale simulation approach

Crystallization-driven tuneable lasing of perylene doped into the nematic liquid crystal

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