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http://hdl.handle.net/1843/54161| Type: | Artigo de Periódico |
| Title: | Infrared fingerprints of natural 2D talc and plasmon-phonon coupling in graphene-talc heterostructures |
| Authors: | Ingrid David Barcelos Roberto Luiz Moreira Helio Chacham Alisson Ronieri Cadore Ananias Borges Alencar Francisco Carlos Barbosa Maia Edrian Mania Rafael Furlan de Oliveira Carlos César Bof Bufon Ângelo Malachias de Souza Raul de Oliveira Freitas |
| Abstract: | 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, graphenebased 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 optovibrational 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. |
| Subject: | Infravermelho Síncrotron Plasmons Nanofotônica |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1021/acsphotonics.7b01017 |
| URI: | http://hdl.handle.net/1843/54161 |
| Issue Date: | 2018 |
| metadata.dc.url.externa: | https://pubs.acs.org/doi/10.1021/acsphotonics.7b01017 |
| metadata.dc.relation.ispartof: | ACS Photonics |
| Appears in Collections: | Artigo de Periódico |
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