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Applied Optics

Applied Optics


  • Vol. 42, Iss. 34 — Dec. 1, 2003
  • pp: 6929–6933

Thermal-changeable complex-refractive-index spectra of merocyanine aggregate films

Takashi Wakamatsu and Shingo Odauchi  »View Author Affiliations

Applied Optics, Vol. 42, Issue 34, pp. 6929-6933 (2003)

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Thermal behaviors of complex refractive index of merocyanine (MC) Langmuir-Blodgett (LB) films have been investigated with absorption spectrum measurements, which are obtained from the Kramers-Kronig (K-K) analysis. The complex-refractive-index spectra with an anomalous dispersion around a J-aggregate absorption band of MC molecules are changed by annealing temperatures. This thermal characteristic is attributed to the annealing-changeable MC J-aggregates. The MC J-aggregates in the LB films collapse in the annealing and become a monomer state. The refractive-index dispersion decreased with the collapse of MC J-aggregates. These behaviors are confirmed from the reflection spectrum measurements under the different conditions of incident light to the MC film samples.

© 2003 Optical Society of America

OCIS Codes
(070.4790) Fourier optics and signal processing : Spectrum analysis
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(160.4890) Materials : Organic materials
(300.1030) Spectroscopy : Absorption
(310.6860) Thin films : Thin films, optical properties

Original Manuscript: May 8, 2003
Published: December 1, 2003

Takashi Wakamatsu and Shingo Odauchi, "Thermal-changeable complex-refractive-index spectra of merocyanine aggregate films," Appl. Opt. 42, 6929-6933 (2003)

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