Frequency-Selective Characteristics of Two-Dimensional Random Array of Fine Silver Particles Formed on AlN and TiO2 Films

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  • AlN 及び TiO<sub>2</sub> 膜上の銀微粒子二次元ランダムアレーの周波数選択特性
  • Frequency-Selective Characteristics of the Two-Dimensional Random Array of Fine Silver Particles Formed on AlN and TiO2 Films

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Abstract

Our previous investigation showed that a random array of fine silver particles formed on sheet glass works as a frequency-selective screen that reflects near-infrared rays and transmits radio waves. In order to improve its screening efficiency, we investigated the use of AlN and TiO2 films with relative dielectric constants of 4.0 and 5.7, respectively, deposited on sheet glass. It was found that for both substrate films resonance reflection occurred at longer wavelengths and the irregular reflectance was lower than for a glass substrate. In particular, the array on the TiO2 film showed a very low value of irregular reflectance and high values of shielding effect and visible light transmittance. These results suggest that a system in which a two-dimensional random array of fine silver particles is fixed on a dielectric film deposited on sheet glass can be applied as a solar control glass, which suppresses near-infrared rays and admits radio waves into a room.<br>

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