Abstract
We have studied the photorefractive properties of (2,4,7-trinitro-9-fluorenylidene)malononitrile (TNFM) sensitized poly(N-vinylcarbazole)/N-ethylcarbazole polymer composites doped with 2-(3,5,5-trimethylhex-2-ene-1-ylidene)-1,3-propanedinitrile and related dyes. Characterization included four-wave mixing experiments, two-beam coupling and photoconductivity measurements at a wavelength of 780 nm. At an applied field of 53 V/μm, we have observed complete internal diffraction and at 68 V/μm a gain coefficient of 230 cm-1. Small alterations in the chromophore donor group substituents were used to tune the ionization potential of the dopant dye by 0.3 eV. They affected the grating build-up time, photorefractive phase shift, and complexation with TNFM. This performance is compared to that of three newly synthesized polymethacrylates functionalized with carbazole, a dodecyl chain as an internal plasticizer and three different dyes. Here we observe net two-beam coupling gain and a diffraction efficiency of 60% at 58 V/μm.
Original language | English (US) |
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Pages (from-to) | 130-139 |
Number of pages | 10 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 4104 |
DOIs | |
State | Published - 2000 |
Externally published | Yes |
Event | Organic Photorefractives, Photoreceptors, and Nanocomposites - San Diego, CA, USA Duration: Jul 31 2000 → Aug 1 2000 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering