2018/03/21 by Denis Garoli, Garoli, Denis, Eugenio Calandrini +11
Materials Science · #Anodic Oxide Films and Nanostructures #Applied Physics (physics.app-ph) #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nanoporous metals and alloys
paper · pdf · doi:10.48550/arxiv.1803.08074
openalex publication_date 2018/03/21 · openalex created_date 2022/08/30 · openalex updated_date 2026/07/28
In this work, we show that modulating the fractal dimension of nanoporous\ngold allows its effective dielectric response to be tailored over a wide\nspectral range of infrared wavelengths. In particular, the plasma edge and\neffective plasma frequency depend linearly on the fractal dimension, which can\nbe controlled by varying the pore and ligament sizes. Importantly, the fractal\nporous metal exhibits superior plasmonic properties compared to its bulk\ncounterpart. These properties, combined with a longer skin depth on the order\nof 100-200 nm, enables the penetration of optical energy deep into the\nnanopores where molecules can be loaded, thus achieving more effective\nlight-matter coupling. These findings may open new pathways to engineering the\noptical response of fractal-like or self-similar metamaterials without the need\nfor sophisticated lithographic patterning.\n