Journal ArticleDOI
Low-Power Optical Reorientation in Dyed Nematics
István Jánossy,Ashley Lloyd +1 more
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TLDR
In this paper, the optical reorientation process in nematic guest-host mixtures is investigated and it is found that for certain dyes the optical Freedericksz threshold is two orders of magnitude lower as in the pure host.Abstract:
The optical reorientation process in nematic guest-host mixtures is investigated. It is found that for certain dyes the optical Freedericksz threshold is two orders of magnitude lower as in the pure host. The observations can be interpreted in terms of an enhanced optical torque which increases with the dye concentration.read more
Citations
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Journal ArticleDOI
Photomodulation of liquid crystal orientations for photonic applications
TL;DR: Two types of photomodulation of orientations of liquid crystals (LCs) are reviewed: 1) order-disorder phase transitions induced by photochemical reactions of photochromic molecules and 2) orderorder alignment change of LCs (change in LC directors) induced by photoochemical reactions or without photochemical events.
Journal ArticleDOI
Photocontrollable liquid-crystalline actuators.
Haifeng Yu,Tomiki Ikeda +1 more
TL;DR: The history of human civilization is accompanied by the development of novel materials, from the period of natural stone, the bronze and iron age, to the modern times of synthetic materials and promising advanced materials, which include fl at panel displays, photonics, photo-driven devices, and more recently nanotechnology.
Journal ArticleDOI
Influence of anthraquinone dyes on optical reorientation of nematic liquid crystals
I. Jánossy,Tamas Kosa +1 more
TL;DR: The dye-induced optical torque exceeds significantly the normal optical torque for all anthraquinone dyes investigated and with one of the dyes, optical Freedericksz transition in a planar layer is demonstrated.
Journal ArticleDOI
Effects of light on molecular orientation of liquid crystals
TL;DR: In this paper, the effects of photo-induced molecular reorientation are fully interpreted within the framework of classical electrodynamics and standard continuum theory of liquid crystals, and a detailed description of the mechanisms of direct optical torque, photoisomerization and photorefractivity and their effect on the macroscopic order of liquid crystal is reported.
Journal ArticleDOI
Recent twists in photoactuation and photoalignment control
TL;DR: In this paper, the authors bring forward some recent examples and emerging trends in this exciting field of research, focusing on liquid crystals, liquid-crystalline polymers and photochromic organic crystals, which serve to highlight the immense potential of light-responsive materials to a wide variety of current and future high-tech applications in photonics, energy harvesting and conversion.
References
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Book ChapterDOI
Optical-Field-Induced Birefringence and Freedericksz Transition in a Nematic Liquid Crystal
TL;DR: In this paper, the optical field induced Freedericksz transition was observed for the first time in nematic 4-cyano-4′-pentylbiphenyl.
Journal ArticleDOI
Anomalous optical Freedericksz transition in an absorbing liquid crystal
TL;DR: In this article, the laser-induced reorientation was studied in absorbing nematic films and the optical Freedericksz threshold occured at an intensity level of 50 W/cm2 in contrast to the normally observed few KW/cm 2 value for transparent layers.
Journal ArticleDOI
Collective rotation of molecules driven by the angular momentum of light in a nematic film.
TL;DR: In this paper, it was shown that a circularly polarized laser beam normally incident on a homeotropically aligned nematic film can induce a collective precession of the molecules in the film if the laser intensity is above the threshold for the Freedericksz transition.
Journal ArticleDOI
Nonlinear Diffraction of CW-Laserbeams by Spatial Selfphase-Modulation in Nematic Liquid Crystals
TL;DR: In this article, a simple model of light-induced reorientation of nematic liquid crystals as nonlinear mechanism was proposed to solve the self-defocussing and nonlinear diffraction effects in the liquid crystal 5CB.
Related Papers (5)
Molecular interpretation of the absorption-induced optical reorientation of nematic liquid crystals.
Influence of anthraquinone dyes on optical reorientation of nematic liquid crystals
I. Jánossy,Tamas Kosa +1 more