Hyper-doped silicon nanoantennas and metasurfaces for tunable infrared plasmonics

Jean-Marie Poumirol; Clément Majorel; Nicolas Chery; Christian Girard; Peter R. Wiecha; Nicolas Mallet; Guilhem Larrieu; Fuccio Cristiano; Richard Monflier; Anne-Sophie Royet; Pablo Acosta Alba; Sébastien Kerdiles; Vincent Paillard; Caroline Bonafos

arXiv · 2011.07779

Hyper-doped silicon nanoantennas and metasurfaces for tunable infrared plasmonics

Jean-Marie Poumirol·Clément Majorel·Nicolas Chery·Christian Girard·Peter R. Wiecha·Nicolas Mallet·Guilhem Larrieu·Fuccio Cristiano·Richard Monflier·Anne-Sophie Royet·Pablo Acosta Alba·Sébastien Kerdiles·Vincent Paillard·Caroline Bonafos

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Abstract

We present the experimental realization of ordered arrays of hyper-doped silicon nanodisks, which exhibit a localized surface plasmon resonance. The plasmon is widely tunable in a spectral window between 2 and 5 $\mu$m by adjusting the free carrier concentration between 10$^{20}$ and 10$^{21}$ cm$^{-3}$. We show that strong infrared light absorption can be achieved with all-silicon plasmonic metasurfaces employing nano-structures with dimensions as low as 100\,nm in diameter and 23 nm in height. Our numerical simulations show an excellent agreement with the experimental data and provide physical insights on the impact of the nanostructure shape as well as of near-field effects on the optical properties of the metasurface. Our results open highly promising perspectives for integrated all-silicon-based plasmonic devices for instance for chemical or biological sensing or for thermal imaging.

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Jean-Marie Poumirol, Clément Majorel, Nicolas Chery, Christian Girard, Peter R. Wiecha, Nicolas Mallet, Guilhem Larrieu, Fuccio Cristiano, Richard Monflier, Anne-Sophie Royet, Pablo Acosta Alba, Sébastien Kerdiles, Vincent Paillard, Caroline Bonafos. 2020-11-16. Hyper-doped silicon nanoantennas and metasurfaces for tunable infrared plasmonics. https://arxiv.org/abs/2011.07779

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