| Texto completo | |
| Autor(es): Mostrar menos - |
Barcelos, Ingrid D.
;
Cadore, Alisson R.
;
Alencar, Ananias B.
;
Maia, Francisco C. B.
;
Mania, Edrian
;
Oliveira, Rafael F.
;
Bufon, Carlos C. B.
;
Malachias, Angelo
;
Freitas, Raul O.
;
Moreira, Roberto L.
;
Chacham, Helio
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS PHOTONICS; v. 5, n. 5, p. 13-pg., 2018-05-01. |
| Resumo | |
Two-dimensional (2D) materials occupy a noteworthy place in nanophotonics providing for subwavelength light confinement and optical phenomena dissimilar to those of their bulk counterparts. In the mid-infrared, graphene-based heterostructures and van der Waals crystals of hexagonal boron nitride (hBN) overwhelmingly concentrate the attention by exhibiting real-space nano-optics features from plasmons, phonon-polaritons, and hybrid plasmon phonon-polaritons. Here we present a prime study on mid-infrared nanophotonics of talc, a natural atomically flat layered material, and graphene-talc (G-talc) heterostructures using broadband synchrotron infrared nanospectroscopy. Wavelength tuning of the talc vibrational resonances, assigned to in- and out-of-plane molecular vibrations, are achieved by changing the thickness of the crystals, which configures a tunable infrared signature for the 2D talc. In G-talc nanostructures, we unveil a coupling of the graphene plasmons polaritons with surface phonons polaritons of talc, originating hybrid surface plasmon-phonon polaritons modes. In analogy to G-hBN and G-SiO2 heterostructures, the coupling in G-talc produces a large increase in the opto-vibrational activity for the out-of-plane mode as well as it induces a blue-shift for the in-plane mode. Moreover, the coupling can be modulated by an external gate voltage to the heterostructure when mounted in a transistor configuration. Therefore, our results introduce talc and G-talc heterostructures as appealing materials for nanophotonics, especially for applications involving long wavelengths and active electric tuning of opto-vibrational activity. (AU) | |
| Processo FAPESP: | 14/25979-2 - Fabricação e caracterização de dispositivos e sistemas baseados em nanomembranas híbridas |
| Beneficiário: | Carlos César Bof Bufon |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |