Applications of photorefractive materials in information storage, processing and communication

Gu, Changzhi; Xu, Yuan; Liu, Yisi; Pan, J. J.; Zhou, Feng; He, Henry

doi:10.1016/s0925-3467(02)00293-8

Cited by 48 publications

(19 citation statements)

References 49 publications

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“…Although, this method is rather simple, it can provide selective doping and add functions, such as photochromic, 10-12 fluorescence, 13 and photoluminescent properties, 14 into photopolymers, resulting in precise control of the fabrication size range and the free design of patterns with these desired functions. Moreover, this method can markedly extend the use of photopolymers with wide varieties of compounds with high sensitivity to light exposure 18,19 and with marked changes in physical, structural, and chemical properties after irradiation with light. By adjusting the optimal combination between photopolymers and functional low molecular weight molecules, this method provides a new means for the fabrication of optical or optoelectronic devices, such as fluorescent character displays and organic electroluminescent (EL) devices with micropatterns.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of micropatterns with dyes in polymer films by selective doping of dye vapor in a vacuum

Mizokuro

Mochizuki

Tanigaki

et al. 2006

Polymers for Advanced Techs

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In this article a novel process for patterning of dye into a positive-type novolac resin is reported by doping vapor of the blue dye, Solvent Blue 59 (SB59), using a simple vacuum process named the vapor transportation method. SB59-doped novolac resin films were examined by UV-vis absorption spectroscopy and optical microscopy. When SB59 vapor was doped into unexposed films at temperatures above 1308C, absorption peaks due to SB59 were detected. In contrast, no absorption peaks were detected when SB59 vapor was doped into exposed films. These results indicated the selective doping of SB59 vapor into unexposed novolac resin films. When SB59 vapor reached the surfaces of micropatterned novolac resin films with both unexposed and exposed areas, SB59 was doped selectively into the unexposed areas of the films, resulting in the production of micropatterns with SB59 molecules in the patterned films.

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Section: Resultsmentioning

confidence: 99%

Fabrication of micropatterns with dyes in polymer films by selective doping of dye vapor in a vacuum

Mizokuro

Mochizuki

Tanigaki

et al. 2006

Polymers for Advanced Techs

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“…In conclusion, we have proposed a novel in-line 2x2 wavelength switch based on H-PDLC gratings sandwiched between two side-polished fibers [21][22][23][24]. The idea has been demonstrated experimentally and analyzed theoretically.…”

Section: Resultsmentioning

confidence: 99%

In-line DWDM wavelength switch using H-PDLC and side-polished fibers

Pan

et al. 2004

SPIE Proceedings

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Optical switches with wavelength selectivity are important and useful in dense wavelength division multiplexing (DWDM) systems, especially in network reconfiguration. One example of such devices is a switchable add/drop filter which is capable of switching between all-through state and wavelength adding (or dropping) state. The building block of such switches is a 2x2 wavelength switch. Most of the existing 2x2 switches, such as those involving two prisms operating in total internal reflection mode or total transmission mode, require light being coupled in and out of the fiber resulting in large device size and high insertion loss. In this paper, we design, analyze, and demonstrate a novel wavelength-selective 2x2 switch by recording electrically switchable holographic gratings in a layer of holographic polymer dispersed liquid crystal (H-PDLC) sandwiched between two side-polished fibers. We first demonstrate our novel idea experimentally, then analyze our result theoretically, and finally design optimized switches for both 100GHz and 50GHz DWDM systems. This device provides in-line operation capability and is particularly suitable for DWDM network reconfiguration.

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“…Holographic photopolymers, first reported in the late 1960s by Close et al [4], are attractive candidates for applications in data storage [5][6][7] though they have limited memory capacity at this moment. Holographic storage has long been the promise for large digital storage capacity because the information packing densities can be considerably increased by using three-dimensional storage techniques [8,9]. Various kinds of recording configurations have been proposed for this purpose [10,11].…”

Section: Introductionmentioning

confidence: 99%

Transflective multiplexing of holographic polymer dispersed liquid crystal using Si additives

Sun¹,

Kang²,

Kim³

2011

Express Polym. Lett.

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Abstract. Morphology, grating formation dynamics and electro-optical performance of transflective multiplexing with holographic polymer dispersed liquid crystal (HPDLC) were investigated in the presence of silica nanoparticles (Aerosil R812 (RS) and modified Aerosil 200 (MS)) and silicon monomer (vinyltrimethoxy silane (VTMS)) by using three coherent laser beams. The addition of Si additive significantly augmented the diffraction efficiencies of transmission and reflection gratings due to the enhanced phase separation with large LC channels. The film was driven only with Si additives which are enriched at the polymer-LC interfaces. As the additive content increased, driving voltage decreased to a minimum of 30 V at 2.0 wt% VTMS. It was found that the interface modification and large droplet size are crucial to operate the film. Among the three types of Si additive, VTMS showed the highest electro-optical performance due to its low viscosity and high reactivity.

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Applications of photorefractive materials in information storage, processing and communication

Cited by 48 publications

References 49 publications

Fabrication of micropatterns with dyes in polymer films by selective doping of dye vapor in a vacuum

Fabrication of micropatterns with dyes in polymer films by selective doping of dye vapor in a vacuum

In-line DWDM wavelength switch using H-PDLC and side-polished fibers

Transflective multiplexing of holographic polymer dispersed liquid crystal using Si additives

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