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Reflectance Control Optical Element and Ultrathin Film Light Absorption Enhancing Element
Reflectance Control Optical Element and Ultrathin Film Light Absorption Enhancing Element
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机译：反射率控制光学元件和超薄膜吸收光元件
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摘要
The present invention provides a simple-structured reflectance control optical element whose reflectance can be significantly changed and precisely controlled. A transparent film is provided on a substrate having a high reflectance, and further on the surface, an ultrathin film consisting of a metal thin film in which metal nanoparticles having an average particle diameter of 10 nm or less are adjacent to or in contact with each other. The metal is at least any of a single platinum group element, an alloy of platinum group elements, and an alloy of a platinum group element and nickel. The thus obtained element having a three-layer structure has a characteristic of a sharp drop in the reflectance to the light of a given wavelength. By appropriately selecting the thickness or the refractive index of the transparent film, the thickness or the materials of the ultrathin film, and the like, it is possible to control the reflectance according to wavelength. In particular, the metal thin film consisting of a platinum group element makes it feasible to easily control the presence or absence of the ultrathin film by pulsed laser irradiation. Moreover, the present invention provides a light absorption enhancing element in the ultrathin film taking advantage of the reflectance modulation characteristics.
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