Abstract
We have synthesized, for the first time, a thin silica film doped with condensed J aggregates of 1,1′-diethyl-2,2′-cyanine bromide dye using a simple sol-gel method. The film is homogeneous in thickness and stable at room temperature. The J band formed in the spin coating process is independent of polarizer angle and the film is isotropic without any dichroism. The high optical nonlinearity (χ3 = 5.0 × 10-7 esu) of the film at the resonance wavelength ( = 577 nm) of the J aggregates was first observed by Z-scan using a 180 fs pulse laser at 77 K under a vacuum ( < 10-5 torr). The doping ratio of J aggregates in silica film suggests that the net |χ(3)| value of pure J aggregates is 4.0 × 10-6 esu. Preliminary experiments using a pump-probe showed the film to have a response time τ of 0.5 ps under 575 nm excitation at room temperature. Since the J aggregates are incorporated into the silica film, further research is likely to lead to improved stability.
Original language | English |
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Pages (from-to) | 180-186 |
Number of pages | 7 |
Journal | Materials Science and Engineering B: Solid-State Materials for Advanced Technology |
Volume | 95 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2002 Aug 1 |
Externally published | Yes |
Keywords
- Doped silica film
- J aggregates
- Nonlinear optical coefficient
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering