摘要：

It is possible by the application of voltage to control the local level in a one-dimensional photonic crystal with a liquid crystal defect layer. In the present paper, a nematic liquid crystal is used and high-speed switching is attempted on the basis of the shift of the localized state wavelength by the photonic bandgap and liquid crystal orientation control. First, by the finite-difference time-domain method, the optical propagation characteristics inside a one-dimensional photonic crystal with a liquid crystal defect layer are analyzed. It is shown that optical switching by control of the localized state wavelength is possible. TiO2 and SiO2 are periodically laminated as a one-dimensional photonic crystal. A nematic liquid crystal layer is introduced as a defect layer to disturb the periodicity, resulting in a one-dimensional photonic crystal with a liquid crystal defect layer. By application of a voltage, the orientation of the liquid crystal defect layer is varied in an attempt to perform optical switching by electric field control of the localized state. High-speed optical switching of microsecond order is successful with nematic liquid crystals. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 88(4): 46-53, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecjb.20087

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