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Applied Optics

Applied Optics


  • Vol. 44, Iss. 6 — Feb. 20, 2005
  • pp: 906–911

Low-refractive-index dye-aggregate films with small absorption based on anomalous dispersion

Takashi Wakamatsu, Keita Watanabe, and Kazuhiro Saito  »View Author Affiliations

Applied Optics, Vol. 44, Issue 6, pp. 906-911 (2005)

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Complex-refractive-index spectra of Squarylium (SQ) dye-aggregate films deposited upon metal films have been investigated by measurements of properties of the films including absorption spectra (AS) and attenuated total reflection. Complex refractive indices are estimated by Kramers-Kronig analysis for the AS and by a theoretical curve-fitting analysis for attenuated total reflection. The dye-aggregate films exhibited an absorption that was blueshifted from that of a monomer, as a result of the H-aggregate formation of SQ molecules, and had a changing refractive index with anomalous dispersion about the H-absorption band. From both measurements of the SQ films it was found that there is a region of low absorption in the short-wavelength side of the absorption band and that the refractive index there is lower than that of glass.

© 2005 Optical Society of America

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

Original Manuscript: April 19, 2004
Revised Manuscript: September 1, 2004
Manuscript Accepted: October 20, 2004
Published: February 20, 2005

Takashi Wakamatsu, Keita Watanabe, and Kazuhiro Saito, "Low-refractive-index dye-aggregate films with small absorption based on anomalous dispersion," Appl. Opt. 44, 906-911 (2005)

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