Optical characteristics of metal (Au, Ag, Cu) island films formed by localized annealing
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초록
내용
Unlike when in a bulk state, nano precious metals (Au, Ag, Cu) exhibit different optical properties depending on the particle size and structure. This is due to the localized surface plasmon resonance effect, which occurs when the particle size is smaller than the wavelength of light. One of the methods of forming metal nanoparticles on a substrate is to use dewetting between the thin metal film and the substrate. In general, it is difficult to form a homogeneous surface when depositing a glass substrate and a metal nano-thin film, such as a thin gold film, due to low adhesion in nano units. When heat is applied to it, it has an island structure to minimize the interfacial energy between the metal and the substrate. Therefore, if heat is applied locally, structural changes can be induced in the desired area. This does not use a pattern mask or chemical reaction, and enables precise control, enabling high-resolution patterning. This process can be used for patterning, SERS and the like.