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Encapsulation of H aggregates in silica film with high nonlinear optical coefficient (χ3=3.0×10−8esu) by a simple sol–gel method

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
57
Issue
3
Identifiers
DOI: 10.1016/s0167-577x(02)00835-2
Keywords
  • H Aggregates
  • Sol–Gel
  • Optical Nonlinearity
  • Silica Film

Abstract

Abstract We first synthesized a thin silica film encapsulated with condensed H aggregates of pseudisocyanine dyes (PIC) cyanine bromide dyes by a simple sol–gel method. The high optical nonlinearity ( χ 3=3.0×10 −8 esu) of the film at the resonance wavelength (=436 nm) of the H aggregates was first observed by a Z-scan method using a 180-fs pulse laser. The net | χ (3)| value of pure H aggregates should be much larger than 3.0×10 −8 esu according to the doping ratio of H aggregates in silica film.

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