Topic
Organic photorefractive materials
About: Organic photorefractive materials is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 13041 citations.
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TL;DR: In this paper, the authors reported the successful femtosecond micro-fabrication of continuous waveguide-like channels in the photorefractive polymer consisting of the nonlinear chromophore 2,5-dimethyl-4-(p-nitrophenylazo)anisole (DMNPAA), the photosensitive compound 2,4,7-trinitro-9-flourenone (TNF), and the plasticiser N-ethylcarbazole (ECZ) all doped in the polymer matrix poly(methyl methacry
Abstract: In this letter, we report on, for the first time, the successful femtosecond micro-fabrication of continuous waveguide-like channels in the photorefractive polymer consisting of the nonlinear chromophore 2,5-dimethyl-4-(p-nitrophenylazo)anisole (DMNPAA), the photosensitive compound 2,4,7-trinitro-9-flourenone (TNF), and the plasticiser N-ethylcarbazole (ECZ) all doped in the polymer matrix poly(methyl methacrylate) (PMMA). These channels are caused by the change in refractive index as a result of the localised heating of the polymer and therefore have an important potential for micro-photonic devices in future.
19 Jul 2005
TL;DR: In this paper, the photorefractive effect was observed in Heion-implanted semi-insulating GaN film in UV spectral region and two beam coupling experiments were performed at a wavelength of 363.8 nm.
Abstract: The photorefractive effect was observed in He-ion-implanted semi-insulating GaN film in UV spectral region. The photorefractive grating is induced by the electroabsorption effect near the band-edge. Two beam coupling experiments were performed at a wavelength of 363.8 nm. The experimental results indicate that absorption grating mainly contributes to the beam coupling effect.
10 Aug 1998
TL;DR: In this article, a double exposure in a Mach Zehnder interferometer with a dual input port was used for the recording of a second harmonic index grating with a period of /spl lambda//2 in a photorefractive KNaSrBaNb/sub 2/O/sub 6/Mn (KNSBN:Mn) crystal.
Abstract: We have proposed and demonstrated a novel scheme for the recording of high harmonic index gratings in photorefractive crystals. By using a double exposure in a Mach Zehnder interferometer with a dual input port, we demonstrated the recording of a second harmonic index grating with a period of /spl lambda//2 in a photorefractive KNaSrBaNb/sub 2/O/sub 6/:Mn (KNSBN:Mn) crystal.
12 May 2013
TL;DR: In this article, the authors used two-dimensional refractive index structures in photorefractive materials to demonstrate discrete solitons, Bloch oscillations and Zener tunneling.
Abstract: Spatiotemporal nonlinear effects caused by the interplay between transverse modulation and nonlinearity open the rich field of research on wave propagation in nonlinear structures. In optics, the induction of two-dimensional refractive index structures in photorefractive materials has been utilized to demonstrate for instance discrete solitons, Bloch oscillations and Zener tunneling, as well as discrete vortex solitons. The unique properties of photorefractive crystals like strontium barium niobate (SBN) facilitate highly nonlinear and reconfigurable refractive index patterns even at low power levels.
28 Aug 1994
TL;DR: In this article, it was shown that preionisation has no influence on the formation of hot spots and the stability of the discharge as long as the preionization electron density is above a level where the avalanche heads overlap during the breakdown phase.
Abstract: ionisation appears to have no influence on the formation of hot spots and the stability of the discharge as long as the preionisation electron density is above a level where the avalanche heads overlap during the breakdown phase.3 With a pre-ionisation below this threshold level, the whole discharge volume is filled with micro-arcs, which strongly reduce the optical output. 'Department of Applied Physics, Twente University, P.O. Box 217, 7500AE Enschede, The Netherlands 1. W. J. Witteman, et al., in Conference on Lasers and Electro-Optics, Vol. 11, Technical Digest Series (Optical Society of America, Washington, DC, 1993), paper CThI3. J. Couts, C. E. Webb, J. Appl. Phys. B59, 704 (1986). A. J. Palmer, Appl. Phys. Lett. 25, 138 (1974). 2.