&lt;title&gt;Near-IR (800 to 855 nm) sensitive holographic photopolymer-dispersed liquid crystal materials&lt;/title&gt;

Pilot, Patrick; Boiko, Yuri B.; Galstian, Tigran

doi:10.1117/12.343867

Cited by 18 publications

(8 citation statements)

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“…One could think about the possibility of the photo initiated chemical bonding, which reduces the NIR absorption and corresponding exited states of IR-140. However, due to the observed dark reaction, the most probably reason of such behavior should be a chemical interaction of the dye with liquid crystals resulting into the decrease of the transition force in the near infrared spectral band, which was used to record holograms in the complex (including monomer) solution [2,3].…”

Section: Discussionmentioning

confidence: 99%

“…Carbon tetrabromide and ethyl 4-dimethylaminobenzoate, both from Aldrich, were added in the monomer solution to obtain the photopolymerizable composition as it was described in Refs. [2,3]. Non-oriented 25 .tm thick cells were used for these spectral measurements performed by Spectrophotometer Cary 500 from Varian.…”

Section: Methodsmentioning

confidence: 99%

“…This approach is considered to be one of the most interesting technologies for the development of reflective color displays, switchable holographic optical elements, switchable-focus lenses, etc. Recently, a near infrared (NIR) sensitive H-PDLC, based on a new photopolymerizable composition, has been reported [2,3]. The laser dye IR-140 (5,5'-dichloro-l l-diphenylamino-3,3'-diethyl-lO,12-ethylenethiatricarbocyanine perchlorate) with a maximum of absorption in the NIR spectral range has been used in this composition [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Spectral properties of the IR-140 dye in liquid crystal matrices

Presnyakov

Galstian

2003

Applications of Photonic Technology 6

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The IR-140 dye has a maximum of absorption in the near infrared spectral range. It can be used successfully for the initiation of photopolymerization in various organic complexes based on polymers and liquid crystals. In this paper we report the experimental observations of the strong influence of the nematic liquid crystal matrix on the spectral properties of this dye. The character of interaction between the dye and liquid crystalline host and its influence on the wavelength dependence of photopolymerization cross section are analyzed.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral properties of the IR-140 dye in liquid crystal matrices

Presnyakov

Galstian

2003

Applications of Photonic Technology 6

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“…The holographic lens was fabricated using a Holographic Photopolymer Dispersed Liquid Crystal (H-PDLC) a mixture of an acrylate monomer, near infrared photosensitizing complex and different liquid crystals 5 . The monomer is chosen to have a good miscibility with several liquid crystals and to have a strong capacity for free radical polymerization with high reactivity.…”

Section: Preparationmentioning

confidence: 99%

<title>In-situ recorded holographic lenses for near-infrared diode lasers</title>

Bouguin¹,

Galstian²

2002

SPIE Proceedings

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In the present work, we use a holographic material sensitized in the near-infrared (850 nm) region for in-situ recording a hologram, which is then used for focusing a near infrared laser beam.The holographic lens was fabricated using a Holographic Photopolymer Dispersed Liquid Crystal (H-PDLC) a mixture of an acrylate monomer, near infrared photosensitizing complex and different liquid crystals. Two approaches, involving these H-PDLCs, are used to create the holographic lens. First we utilize a Titanium-Sapphire laser (pumped by a Verdi laser) beam in order to demonstrate the efficiency of the approach. Secondly we fabricate another holographic lens by means of a commercial diode laser operating at 830 nm. Different characteristics of the recorded holograms, such as their angular and position tolerance, focal length, beam profile, are studied. Aberrations such as chromatic aberration, spherical aberration, astigmatism and comas are also analyzed.

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“…They have sequence of advantages against other types of recording materials such as photo resistors, gelatins, and so on. Polymer dispersed liquid crystal (PDLC) medium is convenient for information recording and storage [1][2][3][4]. The main advantage of such media is that we can follow up the appearing of formations in the real time [5].…”

Section: Introductionmentioning

confidence: 99%

Optimal period for diffraction gratings recorded in polymer dispersed liquid crystals

Aslanyan

Galstyan

2007

Opto-Electronics Review

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New diffusion model of recording diffraction gratings in the media of PDLC is described in which besides diffusion of monomer molecules also diffusion of polymer molecules and non-locality of diffusion coefficient are taken into account. It lets us to explain why diffraction efficiency is low for low and high values of intensities of grating recording beam. With the considered model, we have theoretically got optimal period for grating recording.

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<title>Near-IR (800 to 855 nm) sensitive holographic photopolymer-dispersed liquid crystal materials</title>

Cited by 18 publications

References 0 publications

Spectral properties of the IR-140 dye in liquid crystal matrices

Spectral properties of the IR-140 dye in liquid crystal matrices

<title>In-situ recorded holographic lenses for near-infrared diode lasers</title>

Optimal period for diffraction gratings recorded in polymer dispersed liquid crystals

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