There is a growing interest toward graphene and 2D materials for their exceptional geometrical, optical, and electronic features, which make them unique for photonic and optoelectronic applications. Achieving extraordinarily high absorption by the electric field enhancement on a single atomic plane is a challenging goal for physics and for many of the abovementioned uses. We demonstrate here experimentally for the first time a great enhancement absorption on a large (1 in.) optical device based on single-layer chemical vapor deposition graphene (SLG) by exploiting the electric field inside an asymmetric Fabry-Perot resonator fabricated by radio frequency sputtering. In such a filter, graphene absorption of 84% peaked at 3150 nm is obtained, in very good agreement with COMSOL Multiphysics calculations. Absorption intensity and bandwidth are modeled as a function of the incident angle of the electromagnetic radiation, and the optical constants of SLG are obtained as a function of Fermi energy. The Raman spectrum measured on the SLG in the Fabry-Perot cavity proves the effectiveness of the fabrication method in preserving graphene's physical properties. Our results disclose exciting potentialities for building visible and infrared optical light-absorbing devices based on 2D materials. © 2021 American Chemical Society.

Experimental Mid-Infrared Absorption (84%) of Single-Layer Graphene in a Reflective Asymmetric Fabry???Perot Filter: Implications for Photodetectors

Nicola Lisi;Laura Lancellotti;Rosa Chierchia;Maria Luisa Grilli
2021-01-01

Abstract

There is a growing interest toward graphene and 2D materials for their exceptional geometrical, optical, and electronic features, which make them unique for photonic and optoelectronic applications. Achieving extraordinarily high absorption by the electric field enhancement on a single atomic plane is a challenging goal for physics and for many of the abovementioned uses. We demonstrate here experimentally for the first time a great enhancement absorption on a large (1 in.) optical device based on single-layer chemical vapor deposition graphene (SLG) by exploiting the electric field inside an asymmetric Fabry-Perot resonator fabricated by radio frequency sputtering. In such a filter, graphene absorption of 84% peaked at 3150 nm is obtained, in very good agreement with COMSOL Multiphysics calculations. Absorption intensity and bandwidth are modeled as a function of the incident angle of the electromagnetic radiation, and the optical constants of SLG are obtained as a function of Fermi energy. The Raman spectrum measured on the SLG in the Fabry-Perot cavity proves the effectiveness of the fabrication method in preserving graphene's physical properties. Our results disclose exciting potentialities for building visible and infrared optical light-absorbing devices based on 2D materials. © 2021 American Chemical Society.
2021
absorption; asymmetric Fabry-Perot filters; electric field enhancement; graphene; photodetectors
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/65467
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
social impact