Photo-induced travelling waves in condensed Langmuir monolayers

Yuka Tabe, T. Yamamoto, Yokoyama

研究成果: Article

5 引用 (Scopus)

抄録

We report the detailed properties of photo-induced travelling waves in liquid crystalline Langmuir monolayers composed of azobenzene derivatives. When the monolayer, in which the constituent rodlike molecules are coherently tilted from the layer normal, is weakly illuminated to undergo the trans-cis photo-isomerization, spatio-temporal periodic oscillations of the molecular azimuth begin over the entire excited area and propagate as a two-dimensional orientational wave. The wave formation takes place only when the film is formed at an asymmetric interface with broken up-down symmetry and when the chromophores are continuously excited near the long-wavelength edge of absorption to induce repeated photo-isomerizations between the trans and cis forms. Under proper illumination conditions, Langmuir monolayers composed of a wide variety of azobenzene derivatives have been confirmed to exhibit similar travelling waves with velocity proportional to the excitation power irrespective of the degree of amphiphilicity. The dynamics can be qualitatively explained by the modified reaction-diffusion model proposed by Reigada, Sagués and Mikhailov.

元の言語English
ジャーナルNew Journal of Physics
5
出版物ステータスPublished - 2003 6 6
外部発表Yes

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monomolecular films
traveling waves
isomerization
azimuth
chromophores
illumination
oscillations
symmetry
liquids
wavelengths
excitation
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Photo-induced travelling waves in condensed Langmuir monolayers. / Tabe, Yuka; Yamamoto, T.; Yokoyama.

:: New Journal of Physics, 巻 5, 06.06.2003.

研究成果: Article

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