Polarization-tunable chiral nematic liquid crystal lasing

Abstract

A chiral nematic liquid crystal laser with arbitrarily controllable polarization was demonstrated by combining polymeric cholesteric and nematic liquid crystal films. The lasing polarization states can be continuously varied by applying voltages from 1.25 to 2 V. Right-handed circular polarization is switched to left-handed circularly polarization through −45° linearly polarized states. The trajectories of the Stokes parameters on the Poincaré sphere are used to analyze the variation in lasing polarization. The change in polarization is simulated and the simulation agrees closely with the experimental data.

On‐Demand Polarization Controllable Liquid Crystal Laser

“…By making use of this electro-optic behavior, various device configurations have been presented that use nematic, [35] chiral nematic [36] or a combination of LC phases [37] to manipulate the polarization state of light. [38][39][40][41][42] Moreover, a polarization tuneable chiral nematic LC laser has been demonstrated previously [43] where the polarization state of the output can be controlled. However, in accordance with the findings reported for other polarization devices, the control of the polarization was limited as the orientation of the polarization state could not be controlled directly.…”

Lasing of self-organized helical cholesteric liquid crystal micro-droplets based on emulsification

“…Accordingly, the approach of utilizing external stimuli such as temperature [5][6][7], light [8][9][10][11][12][13], electric field [14,15], and mechanical stress [16] to change the periodic structure (i.e., helical pitch) of CLC and consequently tune the lasing wavelength has been extensively adopted in series of previous works. In addition, both of the emission intensity and polarization can be electrically controlled [17][18][19]. An omnidirectional lasing of CLC droplets based on the mixture of CLC and glycerol was reported [20].…”

Defocused Emission Patterns from Chiral Fluorophores: Application to Chiral Axis Orientation Determination

“…U nderstanding the orientational dependence of molecular chiroptical response is the key to next-generation photonic devices operating on circular polarization states [1][2][3][4] and explaining chiroptical responses from achiral sources, such as water. 5 Additionally, understanding the effects of solvation and local dielectric environment [6][7][8] on chiroptical response is greatly complicated by the entanglement with orientation.…”

“…Understanding the orientational dependence of molecular chiroptical response is the key to next-generation photonic devices operating on circular polarization states − and explaining chiroptical responses from achiral sources, such as water . Additionally, understanding the effects of solvation and local dielectric environment − on chiroptical response is greatly complicated by the entanglement with orientation. , In dye-doped crystals , and molecular systems immobilized at a surface, orientational contributions, related to off-diagonal elements of the rotatory strength tensor, can dominate the measured chiroptical dissymmetry.…”