Nanoporous gold is a very promising and novel material platform for mid-infrared and THz plasmonics. Nanoporous gold can be formed by dealloying of Au–Ag alloys, previously grown by means of Ag-Au co-sputtering. The optical response is completely determined by the nanostructural film features, that depends on the initial alloy composition and on the preparation procedure. The behavior of the material in mid-infrared and its peculiar morphology with a very high surface/volume ratio can be applied for nanostructure fabrication, such for example nanoantennas. Here we report the design and fabrication of nanoporous antennas engineered to support resonances in the 1500-1700 cm-1 range where them can be exploited, for example, in the detection of protein conformational states. This novel paradigm points toward the development of a new class of efficient and high-selective biosensors.
Denis Garoli, Eugenio Calandrini, Sandro Cattarin, Simona Barison, Pierfrancesco Zilio, Angelo Bozzola, Andrea Toma, and Francesco De Angelis, "Engineered/tailored nanoporous gold structures for infrared plasmonics," Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95470K (Presented at SPIE Nanoscience + Engineering: August 10, 2015; Published: 28 August 2015); https://doi.org/10.1117/12.2186562.
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