Polarization holography 2: Polarization holographic gratings in photoanisotropic materials with and without intrinsic birefringence

Тодоров, Т.; Nikolova, L.; Tomova, N.

doi:10.1364/ao.23.004588

Cited by 253 publications

(139 citation statements)

References 4 publications

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“…To create a deector with higher spatial resolution, we employ polarization holography, in which a polarization grating is produced by superimposing two orthogonal CP beams. The superposition of orthogonally polarized CP beams results in a beam with uniform intensity but a linearly rotating polarization state [11]. In experiment, He-Cd laser (center wavelength: 442 nm) was expanded to approximately 6 mm using a pair of lenses (f = 40 mm and 100 mm), and then converted into right circularly polarized (RCP) light using a polarizer and a quarter wave plate.…”

Section: Experimental Methods Interference Exposure Setupmentioning

confidence: 99%

“…However, the angle of de ection was only 0.45°in the previous study, because of limitations in the patterning resolution of helix phase. In this study, we report the fabrication of a large-angle ChLC re ective de ector by performing polarization holography, whereby two orthogonal circularly polarized (CP) beams are superimposed on a photoaligning layer for orientation control [11][12][13][14][15]. Linear polarization gratings with a period as small as 0.84 µm were fabricated, resulting in a di raction angle of 48.9°at a wavelength of 640 nm.…”

Section: Introductionmentioning

confidence: 99%

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Circularly-polarized, large-angle reflective deflectors based on periodically patterned cholesteric liquid crystals

Kobashi¹,

Mohri²,

Yoshida³

et al. 2017

Optical Data Processing and Storage

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Patterned cholesteric liquid crystals enable the fabrication of circular-polarization sensitive, re ective di ractive optical elements based on Bragg re ection. Here we report the fabrication of large-angle re ective deector, which show de ection angles as large as 48.9°. The devices are fabricated by polarization holography, whereby two orthogonal circular polarized beams are superimposed on a photoalignment layer to create a linear modulation of the orientational easy axis. The devices show high circular-polarization extinction ratios, making them potentially useful as functional re ectors and polarization splitters.

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Section: Experimental Methods Interference Exposure Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circularly-polarized, large-angle reflective deflectors based on periodically patterned cholesteric liquid crystals

Kobashi¹,

Mohri²,

Yoshida³

et al. 2017

Optical Data Processing and Storage

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show abstract

“…In our holographic memory system polarization holography is used [7] and the Fourier transformed data page is recorded by using orthogonal circularly polarized object and reference beams in an appropriate 8f arrangement [4]. A suitable model setup (see figure 1) was built to study the behavior of the material under extreme dynamic circumstances like recording Fourier holograms.…”

Section: Saturation Of the Polymermentioning

confidence: 99%

Dynamic behavior of azobenzene polyester used for holographic data storage

et al. 2001

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Dynamic behavior of thin photoaddressable polyester films was studied. The saturation process due to Fourier holographic recording was investigated. Model experiments show an optimal intensity ratio of the object and reference beams, where the highest efficiency occurs. This ratio is inversely proportional to the reference intensity. The material has a significantly higher sensitivity at 407 nm than at 532 nm. For 1 pm thick sample an M# of 0.25 was measurable.

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“…Photochemical reactions have potential applicability to photo-optical switching devices, because they change the electronic structure of the molecules and the density of the system (22)(23)(24)(25). The change in refractive indices and the anisotropy of PMMA (poly(methyl methacrylate)) films containing DAAB (pKiimethylaminoazobenzene) were measured during polarized-light-induced photoisomerization, and the possibility as a photo-optical controlling material was examined (26).…”

Section: η )mentioning

confidence: 99%

Photophysics, Photochemistry, and Photo-optical Effects in Polymer Solids

Horie

1995

ACS Symposium Series

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Photophysics, photochemistry, and optical phenomena of polymers for microelectronics are closely related to one another. By using polyimides as typical examples, it is discussed how photophysics such as charge transfer process affects photochemistry such as photosensitivity of polyimides. Photochemistry such as photoisomerization induces the change in refractive indices providing the phase modulation in optical devices. Microstructure of a polymer liquid crystal is also elucidated by fluorescence spectroscopy.The interaction of light with materials is one of the fundamental subjects in natural science and technology. Phenomena related to light are called in Japanese "hikari" by using a single word, but there are one word and two prefixes concerned with light in English; "light", "photo-" and "opto-". Photochemistry and photophysics deal with the change in materials by light which usually chemists are interested in, and optics deal with the change in light by materials which has been developed mainly by physicists (i). Both aspects of the interaction between light and materials as well as their hybrid phenomena will become more and more important in the field of polymers for microelectronics and photonics. Typical examples of the materials with hybrid phenomena are photorefractive polymers where non-linear optical effects are induced by the space charge generated by the photoirradiation of photoconductive polymers (2) and a command surface where the alignment of nematic liquid crystals are controlled by photoisomerization of azobenzene layer (3). Several examples of photo-and optofunctional materials are summarized in Table I.Polyimides (PI) are well-known because of their excellent thermal stability, and they have become important as high temperature insulation materials in the microelectronics field. They are also expected to be potential materials for various thermostable microelectronics and photonics devices. In the present paper, we use polyimides as typical materials for studying photophysics, photochemistry, optical phenomena and their relations in polymer solids, and report several recent results of the charge-transfer (CT) fluorescence study of aromatic polyimides, the influence of CT state on the photochemistry of photosensitive polyimides, third-order non-linear optical properties of aromatic polyisoimides, and photochemically-induced optical effects in dye-doped polymer films. Charge-transfer and dimer fluorescence studies have also been applied to polymer liquid crystals.

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Polarization holography 2: Polarization holographic gratings in photoanisotropic materials with and without intrinsic birefringence

Cited by 253 publications

References 4 publications

Circularly-polarized, large-angle reflective deflectors based on periodically patterned cholesteric liquid crystals

Circularly-polarized, large-angle reflective deflectors based on periodically patterned cholesteric liquid crystals

Dynamic behavior of azobenzene polyester used for holographic data storage

Photophysics, Photochemistry, and Photo-optical Effects in Polymer Solids

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