Experimental studies of diffraction by photoinduced permanent gratings in nanotube-doped liquid crystals

Lee, Wei; Chen, Hsu Chih

doi:10.1088/0022-3727/35/18/305

Cited by 17 publications

(1 citation statement)

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“…26 An extended effort also resulted in the understanding of the diffractive properties of the permanent gratings. 27 To our knowledge, the photorefractive characteristics of holographic gratings encoded in a hybrid cell of carbon-nanotube-doped liquid crystal have remained untouched. It would be of great interest to examine the photorefractivity in a hybrid structure of a nanotube-doped nematic layer sandwiched between two photoconducting polymeric films.…”

Section: Introductionmentioning

confidence: 99%

Holographic-grating recording in a hybrid cell of nanotube-doped nematic sandwich

Lee

2005

SPIE Proceedings

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Holographic gratings were recorded in hybrid cells of the nematic liquid crystal E7 doped with multi-walled carbon nanotubes in a degenerate two-wave-mixing experiment. The hybrid structure comprises doped nematic contained between photoconducting polymeric layers of poly(N-vinylcarbazole) spin-coated on two indium-tin-oxide-covered glass plates. Multiorder diffraction was observed and the first-order self-diffraction efficiency was obtained in order to investigate the properties of the gratings. The hybrid cells showed quite high diffraction efficiency up to 47%, which is far beyond the theoretical limit of 34% predicted by the Raman-Nath theory. In addition, such a structure was shown to exhibit the photorefractive effect due to the presence of two-beam-coupling gain. Under the condition for a fixed total intensity of the two interfering beams, the gain was found to increase with increasing pump-to-probe beam-intensity ratio.

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Section: Introductionmentioning

confidence: 99%