Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

Zhao, Fuli; Wang, Changshun; Qin, Mu; Zeng, Peng; Cai, Peng

doi:10.1016/j.optcom.2014.11.019

Cited by 10 publications

(5 citation statements)

References 24 publications

(34 reference statements)

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“…The reasons for such discrepancy are described in detail in. [49][50][51] The results demonstrate that the fabricated grating is a pure polarization grating (or in other words the orientation grating) [49,50] i.e., orientation of the side fragments of PAAzo follows the polarization distribution of the interference pattern. This case is displayed schematically in Figure 4b.…”

Section: Transmission Holographic Gratings Recording In the Lc Compos...mentioning

confidence: 83%

Full‐Polymer Cholesteric Composites for Transmission and Reflection Holographic Gratings

Ryabchun

Sakhno

Stumpe

et al. 2017

Advanced Optical Materials

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A new type of self‐organized materials based on cholesteric networks filled with photoactive side‐chain copolymer is being developed. Supramolecular helical structure of cholesteric polymer network resulting in the selective reflection is used as a photonic scaffold. Photochromic azobenzene‐containing nematic copolymer is embedded in cholesteric scaffold and utilized as a photoactive media for optical pattering. 1D and 2D transmission diffraction gratings are successfully recorded in composite films by holographic technique. For the first time the possibility to create selective reflection gratings in cholesteric material mimicking the natural optical properties of cholesteric mesophase is demonstrated. That enables the coexistence of two selective gratings, where one has an intrinsic cholesteric periodic helical structure and the other is a holographic grating generated in photochromic polymer. The full‐polymer composites provide high light‐induced optical anisotropy due to effective photo‐orientation of side‐chain fragments of the azobenzene‐containing liquid crystalline polymer, and prevent the degradation of the helical superstructure maintaining all optical properties of cholesteric mesophase. The proposed class of optical materials could be easily applied to a broad range of polymeric materials with specific functionality. The versatility of the adjustment and material preprogramming combined with high optical performance makes these materials a highly promising candidate for modern optical and photonic applications.

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Section: Transmission Holographic Gratings Recording In the Lc Compos...mentioning

confidence: 83%

Full‐Polymer Cholesteric Composites for Transmission and Reflection Holographic Gratings

Ryabchun

Sakhno

Stumpe

et al. 2017

Advanced Optical Materials

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“…Other features that are worth being studied in LCE-based polarization gratings are polarization properties of the diffracted light and the effect of mechanical strain and temperature on these properties [53]. Another open problem that can be conveniently investigated by analysis of optical polarization gratings, is photo-induced alignment in the LCE materials [36,54].…”

Section: Discussionmentioning

confidence: 99%

Peculiar behaviour of optical polarization gratings in light-sensitive liquid crystalline elastomers

Prijatelj

Ellabban

Fally

et al. 2016

Opt. Mater. Express

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The angular dependence of the diffraction efficiency of volumetype\ud holographic gratings recorded in a single-domain light-sensitive liquid\ud crystalline elastomer was investigated. Usually this dependence is expected\ud to be very similar for intensity gratings and for polarization gratings.\ud However, our measurements resolved a profound difference between the\ud two types of the gratings: a typical Bragg peak of the diffraction efficiency\ud is observed only for intensity gratings, while polarization gratings exhibit a\ud profound dip at the Bragg angle. The appearance of this dip is explained by\ud strongly anisotropic optical absorption of the actinic light during the\ud recording process

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“…[5][6][7][8] The LC order promotes a specified arrangement of azobenzene groups leading to high birefringence in films of these polymers. Sensitivity to the light polarization by means of photoorientation ensures that Azo LC polymers can be used for polarization holography, 9 providing a way for designing of highperformance polarization-sensitive gratings, 10 lens, 11 beam steering systems 12 and so on. 13 To record polarization holograms various combinations of linearly and circularly polarized laser beams can be used but two orthogonal circularly polarized beams generally turn out more appropriate for Azo polymers.…”

Section: Introductionmentioning

confidence: 99%

Azobenzene‐containing liquid crystalline poly(methacrylates) with different spacer length as media for holographic grating recording

Bugakov,

Shibaev,

Boiko

2024

Journal of Polymer Science

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Liquid crystalline (LC) poly(methacrylates) with azobenzene moieties in their side chains have been synthesized and their chemical structure has been confirmed with nuclear magnetic resonance spectroscopy and gel permeation chromatography. Azobenzene moieties are linked to polymer backbone via an alkyl spacer with length from 2 to 10 methylene units. Photooptical processes in thin amorphized polymer films are examined through measurements of optical anisotropy and holographic grating recording. Birefringence values induced with a linearly polarized green (532 nm) laser beam has strongly depended from the spacer length. Irradiation with two circularly polarized green laser beams leads to the formation of polarization and surface relief gratings, which have been visualized with polarized optical and atomic force microscopy, respectively. Diffraction efficiency of the recorded gratings is in correlation with the spacer length, namely, the shorter the spacer, the higher diffraction efficiency can be achieved. For polymers with short spacers polarization gratings can be easily erased by circularly polarized light, but only partial erasing of surface relief gratings is observed. The results presented offer the possibility of tailoring the chemical structure of azobenzene‐containing polymers for designing high‐efficiency media for the holographic recording.

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Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

Cited by 10 publications

References 24 publications

Full‐Polymer Cholesteric Composites for Transmission and Reflection Holographic Gratings

Full‐Polymer Cholesteric Composites for Transmission and Reflection Holographic Gratings

Peculiar behaviour of optical polarization gratings in light-sensitive liquid crystalline elastomers

Azobenzene‐containing liquid crystalline poly(methacrylates) with different spacer length as media for holographic grating recording

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