All-optical dynamic correction of distorted communication signals using a photorefractive polymeric hologram

Li, Guoqiang; Eralp, Muhsin; Thomas, Jayan; Tay, Savaş; Schülzgen, Axel; Norwood, Robert A.; Peyghambarian, N.

doi:10.1063/1.1898432

Cited by 20 publications

(13 citation statements)

References 27 publications

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“…Figure 7a,b shows the input object beam without aberration and its reconstructed image (probe diffraction) which, due to the rather thick sample, shows some degree of degradation. The well-known ability33334 of such optical phase conjugation process to produce a retro-reflected aberration-free image of the object beamis clearly illustrated by Fig. 7c,d for the input aberrated object beam and its reconstructed image, respectively.…”

Section: Resultsmentioning

confidence: 92%

High efficiency holographic Bragg grating with optically prolonged memory

Khoo

Chen

2016

Sci Rep

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In this paper, we show that photosensitive azo-dye doped Blue-phase liquid crystals (BPLC) formed by natural molecular self-assembly are capable of high diffraction efficiency holographic recording with memory that can be prolonged from few seconds to several minutes by uniform illumination with the reference beam. Operating in the Bragg regime, we have observed 50 times improvement in the grating diffraction efficiency and shorter recording time compared to previous investigations. The enabling mechanism is BPLC’s lattice distortion and index modulation caused by the action of light on the azo-dopant; upon photo-excitation, the azo-molecules undergo transformation from the oblong-shaped Trans-state to the bent-shaped Cis-state, imparting disorder and also cause the surrounding BPLC molecules to undergo coupled flow & reorientation leading to lattice distortion and index modulation. We also showed that the same mechanism at work here that facilitates lattice distortion can be used to frustrate free relaxation of the lattice distortion, thereby prolonging the lifetime of the written grating, provided the reference beam is kept on after recording. Due to the ease in BPLC fabrication and the availability of azo-dopants with photosensitivity throughout the entire visible spectrum, one can optimize the controlling material and optical parameters to obtain even better performance.

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Section: Resultsmentioning

confidence: 92%

High efficiency holographic Bragg grating with optically prolonged memory

Khoo

Chen

2016

Sci Rep

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“…One process to deal with these distortions is to generate the phase-conjugate beam of the aberrated object beam through the four wave mixing process. Li et al discuss a simple model: [ 212 ] A receiver station sends an information-less beam through the aberrating medium to the sending station, adding distortions to the beam. The sending station phase-modulates the information onto the beam and redirects it to the receiver station by use of a phase-conjugating mirror.…”

Section: Dynamic Distortion Correctionmentioning

confidence: 99%

Organic Photorefractive Materials and Applications

2011

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This review describes recent advances and applications in the field of organic photorefractive materials, an interesting area in the field of organic electronics and promising candidate for various aspects of photonic applications. We describe the current state of knowledge about the processes involved in the formation of photorefractive gratings in organic materials and focus on the chemical and photo‐physical aspects of the material structures employed in low glass‐transition temperature amorphous composites and organic photorefractive glasses. State‐of‐the art materials are highlighted and recent demonstrations of photonic applications relying on the reversible holographic nature of the photorefractive materials are discussed.

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“…Photorefractive materials have been investigated for many applications like dynamic holographic memories 1 , reconfigurable interconnects 2 , tunable filters 3 and beam cleanup 4 . Recently, organic PR materials have gained attention due to their low-cost, tunability of their properties as well as large optical nonlinearity compared to their inorganic counterparts 5 .…”

Section: Introductionmentioning

confidence: 99%

Photorefractive polymer in reflection geometry with large efficiency

et al. 2006

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We have investigated photorefractive (PR) properties of a polymer composite with low glass-transition temperature (T g ) in a symmetric reflection geometry. A diffraction efficiency of more than 30% is observed in 105µm thick devices. In low T g photorefractive polymers, poling of the nonlinear optical chromophores at room temperature leads to birefringence in the material. The birefringence will alter the Bragg condition, as the propagation vectors for object and reference beams as well as the readout angle are influenced. We observed the Bragg-mismatch effect that caused a reduction in diffraction efficiency as the external field is increased. We have varied the angle of readout beam slightly at each bias field to get the highest efficiency.

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All-optical dynamic correction of distorted communication signals using a photorefractive polymeric hologram

Cited by 20 publications

References 27 publications

High efficiency holographic Bragg grating with optically prolonged memory

High efficiency holographic Bragg grating with optically prolonged memory

Organic Photorefractive Materials and Applications

Photorefractive polymer in reflection geometry with large efficiency

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