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.
Fractal-Like Plasmonic Metamaterial with a Tailorable Plasma Frequency in the near-Infrared / Garoli, Denis; Calandrini, Eugenio; Bozzola, Angelo; Toma, Andrea; Cattarin, Sandro; Ortolani, Michele; De Angelis, Francesco. - In: ACS PHOTONICS. - ISSN 2330-4022. - 5:8(2018), pp. 3408-3414. [10.1021/acsphotonics.8b00676]
Fractal-Like Plasmonic Metamaterial with a Tailorable Plasma Frequency in the near-Infrared
Calandrini, Eugenio;Ortolani, MichelePenultimo
;
2018
Abstract
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.File | Dimensione | Formato | |
---|---|---|---|
Garoli_Fractal-Like Plasmonic_2018.pdf
solo gestori archivio
Tipologia:
Documento in Post-print (versione successiva alla peer review e accettata per la pubblicazione)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
539.82 kB
Formato
Adobe PDF
|
539.82 kB | Adobe PDF | Contatta l'autore |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.