Fractal-Like Plasmonic Metamaterial with a Tailorable Plasma Frequency in the near-Infrared
| Autor: | Michele Ortolani, Andrea Toma, Denis Garoli, Francesco De Angelis, Angelo Bozzola, Sandro Cattarin, Eugenio Calandrini |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Infrared Physics::Optics 02 engineering and technology 010402 general chemistry Plasma oscillation 01 natural sciences Fractal dimension Fractal Self-similar Infrared plasmonics Electrical and Electronic Engineering Plasmon Nanoporous business.industry Metamaterial Fractal metamaterial 021001 nanoscience & nanotechnology fractal metamaterial infrared plasmonics nanoporous gold self-similar spoof plasmons Electronic Optical and Magnetic Materials Biotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Wavelength Spoof plasmons Optoelectronics Nanoporous gold 0210 nano-technology business |
| Zdroj: | ACS photonics 5 (2018): 3408–3414. doi:10.1021/acsphotonics.8b00676 info:cnr-pdr/source/autori:Garoli D.; Calandrini E.; Bozzola A.; Toma A.; Cattarin S.; Ortolani M.; De Angelis F./titolo:Fractal-Like Plasmonic Metamaterial with a Tailorable Plasma Frequency in the near-Infrared/doi:10.1021%2Facsphotonics.8b00676/rivista:ACS photonics/anno:2018/pagina_da:3408/pagina_a:3414/intervallo_pagine:3408–3414/volume:5 |
| ISSN: | 2330-4022 |
| Popis: | In this work, we show that modulating the fractal dimension of nanoporous gold allows its effective dielectric response to be tailored over a wide spectral range of infrared wavelengths. In particular, the plasma edge and effective plasma frequency depend linearly on the fractal dimension, which can be controlled by varying the pore and ligament sizes. Importantly, the fractal porous metal exhibits superior plasmonic properties compared to its bulk counterpart. These properties, combined with a longer skin depth on the order of 100-200 nm, enables the penetration of optical energy deep into the nanopores where molecules can be loaded, thus, achieving more effective light-matter coupling. These findings may open new pathways to engineering the optical response of fractal-like or self-similar metamaterials without the need for sophisticated lithographic patterning. |
| Databáze: | OpenAIRE |
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