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20 August 2020 Optical materials beyond noble metals
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The alloying of metals (Ag, Au, Cu, Al) has enabled the development of optical materials with unprecedented permittivity values, not found in its pure counterparts. Specifically, we overcome the constrain imposed by the pre-defined permittivity of pure metals by demonstrating the unique near- and far-field optical properties of these alloys for energy harvesting devices, and how they are correlated with the alloys band structure. Moreover, we demonstrate superabsorbers using Al-Cu/semiconductor with near-unity (>99%) and omnidirectional absorption in the visible and NIR range of the spectrum, formed by a simple dual-layer thin film stack. Concerning reconfigurability, we present a platform for transient photonic devices based exclusively on earth-abundant materials: Mg and MgO. We show color pixels covering the entire sRGB, where the hues can vanish in a few minutes upon system's exposure to water, very relevant for applications ranging from encryption to biodegradable displays.
Conference Presentation
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Marina S. Leite "Optical materials beyond noble metals", Proc. SPIE 11461, Active Photonic Platforms XII, 1146128 (20 August 2020);

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