Toward Solid-State Switchable Mirror Devices Using Magnesium-Rich Magnesium–Nickel Alloy Thin Films

概要

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All-solid-state devices with switchable mirror properties based on magnesium-rich magnesium–nickel alloy thin films have been prepared using magnetron sputtering. The structure of the devices was a Mg–Ni alloy (40 nm)/Pd (4 nm)/Ta2O5 (200 nm)/HxWO3 (500 nm)/ITO on a glass. The composition of the alloy was Mg5Ni. In the initial state, the devices showed a shiny metallic front side and a deep blue back side, namely, in a reflective state. The optical transmittance of the devices at a wavelength of 670 nm was modulated between ${\sim}0.3$% (the reflective state) and ${\sim}40$% (the transparent state) by applying a voltage of $\pm 5$ V between the ITO and the Mg–Ni alloy layer. The color of the portion changed to the transparent state was relatively neutral. The transition from the reflective state to the transparent state started from the fringe of the electric contact on the Mg–Ni alloy side, and the transparent region spread gradually.
2007-08-15