Graphene Plasmonic Fractal Metamaterials for Broadband Photodetectors
| Autor: | De Nicola, Francesco, Purayil, Nikhil Santh Puthiya, Miŝeikis, Vaidotas, Spirito, Davide, Tomadin, Andrea, Coletti, Camilla, Polini, Marco, Krahne, Roman, Pellegrini, Vittorio |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Sci. Rep. 10 (2020) 1-10 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41598-020-63099-0 |
| Popis: | 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 $10^{11}$ Jones and a gain up to $10^{6}$, 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 $|E/E_{0}|\approx20$ 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. Comment: 10 pages, 6 figures |
| Databáze: | arXiv |
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