Laser Emission in a Dye Doped Cholesteric Polymer Network

Schmidtke, Jürgen; Stille, W.; Finkelmann, Heino; Kim, Sung Tae

doi:10.1002/1521-4095(20020517)14:10<746::aid-adma746>3.0.co;2-5

Cited by 217 publications

(132 citation statements)

References 3 publications

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“…The fluorescent emission in these materials is suppressed in the reflection band and is enhanced at the band edges. This enhancement and distributed feedback effect can give rise to low threshold mirror-less lasing at the band edge in various liquid crystal materials [12][13][14][15][16][17][18][19][20][21].…”

Section: Lasing In Pure Cholesteric Liquid Crystalmentioning

confidence: 99%

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Porov¹,

Chandel²,

Manohar³

2015

Transactions on Electrical and Electronic Materials

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Cholesteric liquid crystals naturally form helical structures with the helical pitch in an optical wavelength range [7]. The dye and cholesteric liquid crystal molecules are together subjected to the electric field action, which produces a collective movement that leads to changes in molecular arrangement, notably the applied electric field direction. As a result of the applied field, the helical molecular arrangement axis is perpendicular to the electric field direction and then produces an increase in the helical structure pitch [8,9].A cholesteric liquid crystal can be considered as a one-dimensional photonic crystal with a refractive index that is regularly modulated along the helix axis because of the particular arrangement of the molecules. The result is that the propagation of light is suppressed for a particular range of wavelength [10]. Preeti Porov† and Vishal Singh Chandel Department of Physics, Integral University, Lucknow 226026, IndiaReceived January 8, 2015; Revised April 9, 2015; Accepted May 3, 2015Cholesteric liquid crystals are one dimensional photonic band-gap materials due to their birefringence and periodic structure. Dye doped cholesteric liquid crystals are self-assembling, mirror-less, low threshold laser structures that exhibit distributed feedback. In this review paper, we have presented the development in the field of lasing characteristics of dye doped cholesteric liquid crystals.

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Section: Lasing In Pure Cholesteric Liquid Crystalmentioning

confidence: 99%

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Porov¹,

Chandel²,

Manohar³

2015

Transactions on Electrical and Electronic Materials

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“…Another interesting and unusual property of LCE is that its physical behavior can be controlled by various external stimuli, such as heat, light, electric field, and mechanical stress [18,19]. These exceptional properties of LCE have led to its widespread application in artificial muscles [20][21][22], shape memory [23][24][25][26][27], thermomechanical actuation [2,7,8,28], soft elasticity [29][30][31][32], motors [22,23], contact lenses [24], micro-grippers in microsystems [25], valves for microfluids [26], tunable lasing media [28][29][30][31][32], electro-optical systems like adaptive lenses [24,33], and sensors [9,10,34].…”

Section: Introductionmentioning

confidence: 99%

Study of the optical, thermal, and mechanical properties of nematic liquid crystal elastomers

Mani

Hadkar

Jessy

et al. 2016

Journal of Information Display

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In the present study, the optical, thermal, and mechanical properties of liquid crystal elastomers (LCEs) were investigated using various techniques. The presence of functional groups in LCE was studied using Fourier transform infrared spectroscopy. The phase transition temperatures were confirmed via polarizing optical microscopy and Fabry-Perot scattering studies. The differential thermal analysis was used for investigating the thermal behavior. A dynamic mechanical analysis was used to study the mechanical properties of LCE. The significant mechanical changes with a considerable reversible effect were observed for this soft material. The changes in the mechanical shape with the temperature are attributed to the change in the phase of the LCE material. ARTICLE HISTORY

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“…As a consequence, the fluorescent emission in these materials is suppressed in the reflection band and is enhanced at the band edges. This gain enhancement and distributed feedback effect can give rise to low threshold mirrorless lasing at the band edge in a variety of liquid crystal materials [2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Lasing Thresholds of Cholesteric Liquid Crystals Lasers

Cao

Palffy‐Muhoray

Taheri

et al. 2005

Molecular Crystals and Liquid Crystals

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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 0.1-3.0wt%, and cell thicknesses are in the range of 5-50µm. We have found that the system has a shallow lasing threshold minimum and can operate efficiently in the range of dye concentrations of 0.3-2.4wt% and sample thicknesses of 10-50µm. We discuss the physical processes responsible for the observed behaviour.

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Laser Emission in a Dye Doped Cholesteric Polymer Network

Cited by 217 publications

References 3 publications

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Study of the optical, thermal, and mechanical properties of nematic liquid crystal elastomers

Lasing Thresholds of Cholesteric Liquid Crystals Lasers

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