High nonlinear optical coefficient (χ3 = 10-7 esu) of cyanine dye J aggregates doped silica film synthesized by a simple sol-gel method

H. S. Zhou, T. Watanabe, A. Mito, I. Honma, K. Asai, K. Ishigure, M. Furuki

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 languageEnglish
Pages (from-to)180-186
Number of pages7
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume95
Issue number2
DOIs
Publication statusPublished - 2002 Aug 1
Externally publishedYes

Keywords

  • Doped silica film
  • J aggregates
  • Nonlinear optical coefficient

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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