Lasing cholesteric capsules
نویسندگان
چکیده
منابع مشابه
Lasing Thresholds of Cholesteric Liquid Crystals Lasers
Cholesteric liquid crystals (CLCs) are one dimensional photonic band-gap materials. Due to distributed feedback, low threshold mirrorless lasing can occur in dye-doped and pure CLCs. In order to optimize the lasing conditions, we have studied the dependence of the lasing threshold on dye concentration and sample thickness. In particular, we have studied dye concentrations in the range of 0.1-3....
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We report the observation of stimulated emission and mirrorless lasing in pure cholesteric liquid crystals. The lasing action is attributed to the combination of the fluorescence and the distributed feedback that are due to the inherent periodic structure of the liquid crystal. If the reflection band matches the intrinsic emission of the cholesteric liquid crystal, the crystal becomes a natural...
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Low-threshold lasing is observed at the edge of the stop band of a one-dimensional structure-a dye-doped cholesteric liquid-crystal film. The mode closest to the edge has the lowest lasing threshold. The rates of spontaneous and stimulated emission are suppressed within the stop band and enhanced at the band edge. The ratio of right to left circularly polarized spontaneous emission is in good a...
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We report wide range and reversible tuning of the selective reflection band of a single crystal cholesteric liquid crystal elastomer (CLCE). The tuning is the result of mechanical shortening of the helical pitch achieved by imposing a uniform uniaxial strain along the helical axis. On doping the CLCE sample with a laser dye, we observe lasing from the CLCE in both glassy and rubbery states. By ...
متن کاملLasing at the edge of a photonic stop band in cholesteric liquid crystals
Modern electronics is based upon semiconductors, materials that possess a gap in the electronic energy spectrum as a result of coherent scattering in a periodic potential (Fig. 1). Light is emitted when electrons in the conduction band recombine with holes in the valence band. Because the excited electrons and holes are long lived their densities are readily controlled by an applied voltage. A ...
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ژورنال
عنوان ژورنال: Ukrainian Journal of Physical Optics
سال: 2016
ISSN: 1609-1833
DOI: 10.3116/16091833/17/4/169/2016