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Crystals 2015, 5(1), 163-171;

Infrared Extinction of a Dye-Doped (Polymer/Liquid Crystal) Composite Film

Graduate School of Science and Engineering, Kagoshima University, Korimoto 1, Kagoshima-shi, Kagoshima 890-0065, Japan
Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan
Author to whom correspondence should be addressed.
Academic Editor: Hiroyuki Yoshida
Received: 16 January 2015 / Revised: 28 January 2015 / Accepted: 4 February 2015 / Published: 2 March 2015
(This article belongs to the Special Issue Liquid Crystal Films)
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Infrared extinction of a dye-doped (polymer/liquid crystal) composite film was investigated. It is found that doping a metal-complex dye into the liquid crystal extended the operation wavelength to an optical fiber communication wavelength of about 1.5 μm. An aperture placed behind the composite film greatly improves an extinction ratio, which suggests the film functions on the basis of light scattering. Some experimental results agree to Rayleigh scattering. The film exhibits the high extinction ratio of 51 or 17.1 dB and a low polarization dependent loss of 7.6% or 0.32 dB and, then, it could be applied to a telecommunication device such as a variable optical attenuator. View Full-Text
Keywords: liquid crystal; variable optical attenuator; dichroic dye; light scattering; composite film liquid crystal; variable optical attenuator; dichroic dye; light scattering; composite film

Figure 1

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Fukushima, S.; Ariki, K.; Yoshinaga, K.; Higuchi, H.; Kikuchi, H. Infrared Extinction of a Dye-Doped (Polymer/Liquid Crystal) Composite Film. Crystals 2015, 5, 163-171.

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