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We investigated a fabrication process and optical properties of electro-optic (EO) light modulators with Fabry-Perot structure, which consisted of PLZT [(Pb0.91, La0.09)(Zr0.65, Ti0.35)O3] thick films by aerosol deposition method. A supernatant elimination process for small size PLZT powder with diameter of 0.125-0.175 μm was effective in order to obtain a transparent film. In the fabricated Fabry-Perot type EO light modulator with a ITO (Indium Tin Oxide))/PLZT/ITO defect layer, a wavelength of resonant localized mode was shifted about 1.0 nm from 788 nm by applying an electric field of +400 kV/cm in reflectance mode, and consequently the reflectance difference of 7.2 % was observed. The Fabry-Perot type EO light modulator had the advantage of contrast of light in the reflection mode.

This paper introduces the self-generation vibration sensor using levitated magnet. We have verified experimentally and theoretically that this sensor is available in frequencies of 5 to 25 Hz. The frequency response of sensitivity shows the maximal value at certain frequency. These sensitivities obtained 3.9 V/G at 11 Hz for levitated magnet of neodymium and 3.0 V/G at 10 Hz for the magnet of samarium cobalt. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(2): 1–8, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20525