Liquid crystal devices for optical communication and information processing systems

Hirabayashi, Katsuhiko; Kurokawa, Takashi

doi:10.1080/02678299308027645

Cited by 53 publications

(17 citation statements)

References 25 publications

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“…In recent years, these materials have been seriously considered for linear and non-optical applications, such as efficient light polarization [l], optical information storage [2,3], optical communication and information processing [4], and frequency conversion [5-71. Normally, low molar mass organics tend to crystallize over time, giving rise to a polycrystalline character that is detrimental to contact at an interface and is undesirable because of light scattering from grain boundaries. Intensive research in the recent past has produced numerous GLMLCs with a * Author for correspondence.…”

Section: Introductionmentioning

confidence: 99%

Novel glass-forming liquid crystals. III Helical sense and twisting power in chiral nematic systems

Shi¹,

Chen²

1995

Liquid Crystals

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Based on nematic and chiral precursors comprising of acetylenic, phenyl, naphthyl and terminal cyan0 groups in conjugation and cyclohexane as the central core, a series of novel nematic and chiral nematic glass-forming liquid crystals with a T . 3 6 0°C were synthesized for an investigation of handedness and helical twisting power, HTP, as functions of chemical structure.Three chiral building blocks with a single asymmetric carbon Centre were employed: (S)-( -)-1-phenylethanol, (9-( -)-u-methyl-2-naphthalenemethanol, and (S)-( -)-1-phenylethylamine, were all found to yield a left-handed cholesteric mesophase. With reference to (5')-( -)-1-phenylethanol, the HTP value was found to be nearly doubled in the presence of a strong anchoring plane furnished by a naphthyl group surrounding the asymmetric carbon centre, but reduced by one third in the presence of intermolecular hydrogen bonding through the amide group. All these observations were properly accounted for by a molecular interaction model of a steric nature while allowing for hydrogen bonding. Consistent with previous observations on naturally occurring ( -)-cholesterol, ( + )-estrone was found to give a left-handed cholesteric mesophase and an HTP value a quarter of that of (8-( -)-1-phenylethanol under otherwise identical structural settings, both remaining unaccounted for from a molecular point of view. The cyclohexane ring to which chiral as well as nematic precursors are attached was found to improve miscibility with cyclohexane-based nematic hosts and to elevate the T . of the blends with an improved morphological stability but a very modest increase in HTP, all in comparison to c h i d precursors as the dopant. The optical elements prepared on a single glass substrate and between a pair of substrates using the presently reported materials showed broad selective wavelength reflection bands with a monodomain feature characterized by pronounced side band oscillations.

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Section: Introductionmentioning

confidence: 99%

Novel glass-forming liquid crystals. III Helical sense and twisting power in chiral nematic systems

Shi¹,

Chen²

1995

Liquid Crystals

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“…The wavelength of optical signal they modulated are in the micron scale. 9 With the development of Micro-systems (MEMS / MOEMS) technology, Fabry-Perot interference(FPI) has been extended for imaging applications. Based on the MEMS, adjustable wavelength of the filter 10, 11 is extended into the infrared range.…”

Section: Introductionmentioning

confidence: 99%

Smart hyperspectral imaging detection based on electrically tunable liquid-crystal Fabry-Perot microstructure array

Liu

et al. 2009

SPIE Proceedings

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A smart spectral imaging detection method based on the integration of electrically tunable liquid-crystal(LC) Fabry-Perot(FP) microstructure array is proposed. It has very broad application in many fields with advantages of low cost, highly compact integration and working without mechanical part. The device can get hundreds of spectral bands simultaneously in one frame of picture in theory. This paper proposes the structure of smart spectral imaging array device, and analyses some key issues of liquid crystal Fabry-Perot structures for imaging application and calibration. Prototypes of 4 × 4 LC-FP array with the cavity thickness ranging from 4 to 20 µm for the working wavelength in the range of 800∼900nm, are made by lithography and wet etching. Test is carried out and analysed.

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“…Unique optical properties of helicoidal LCs were found to arise when the LC is inside a Fabry-Perot cavity including polarization independence of the transfer function [14]. The interest in liquid crystal tunable filters (LCTFs) using the above concepts was stimulated from their potential use in displays [15,16] and telecommunications [17]. The integration of LCTFs into imaging systems has emerged recently [18].…”

Section: Lc Tunable Filters Applications In Biomedical Optical Technimentioning

confidence: 99%

Biomedical Optical Applications of Liquid Crystal Devices

2007

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Liquid crystals exhibit large electro-optic effects which make them useful for a variety of applications as fast, compact, and tunable spectral filters, phase modulators, polarization controllers, and optical shutters. They were largely developed for liquid crystal displays and in the last decade for optical telecommunications, however their application in the field of optical imaging just started to emerge. These devices can be miniaturized thus have a great potential useful in miniature optical imaging systems for biomedical applications. Using a collection of tunable phase retarders one can perform: 1. Stokes parameters imaging for skin and eye polarimetric imaging; 2. Tunable filtering to be used for hyperspectral imaging, fluorescence microscopy, and frequency domain optical coherence tomography; 3. Adaptive optical imaging and eye aberrations correction; 4. Phase shift interferometric imaging; 5. Variable frequency structured illumination microscopy. Basic optics of liquid crystals devices is reviewed and some novel designs are presented in more detail when combined to imaging systems for a number of applications in biomedical imaging and sensing.

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Liquid crystal devices for optical communication and information processing systems

Cited by 53 publications

References 25 publications

Novel glass-forming liquid crystals. III Helical sense and twisting power in chiral nematic systems

Novel glass-forming liquid crystals. III Helical sense and twisting power in chiral nematic systems

Smart hyperspectral imaging detection based on electrically tunable liquid-crystal Fabry-Perot microstructure array

Biomedical Optical Applications of Liquid Crystal Devices

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