Details

Autor(en) / Beteiligte

• De Nicola, Francesco
• Puthiya Purayil, Nikhil Santh
• Miŝeikis, Vaidotas
• Spirito, Davide
• Tomadin, Andrea
• Coletti, Camilla
• Polini, Marco
• Krahne, Roman
• Pellegrini, Vittorio

Titel

Graphene Plasmonic Fractal Metamaterials for Broadband Photodetectors

Ist Teil von

• Scientific reports, 2020-04, Vol.10 (1), p.6882-6882, Article 6882

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2020

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Metamaterials have recently established a new paradigm for enhanced light absorption in state-of-the-art photodetectors. Here, we demonstrate broadband, highly efficient, polarization-insensitive, and gate-tunable photodetection at room temperature in a novel metadevice based on gold/graphene Sierpinski carpet plasmonic fractals. We observed an unprecedented internal quantum efficiency up to 100% from the near-infrared to the visible range with an upper bound of optical detectivity of 10 Jones and a gain up to 10 , which is a fingerprint of multiple hot carriers photogenerated in graphene. Also, we show a 100-fold enhanced photodetection due to highly focused (up to a record factor of |E/E | ≈ 20 for graphene) electromagnetic fields induced by electrically tunable multimodal plasmons, spatially localized in self-similar fashion on the metasurface. Our findings give direct insight into the physical processes governing graphene plasmonic fractal metamaterials. The proposed structure represents a promising route for the realization of a broadband, compact, and active platform for future optoelectronic devices including multiband bio/chemical and light sensors.