| Grant number: | 18/05425-3 |
| Support Opportunities: | Scholarships in Brazil - Master |
| Start date: | July 01, 2018 |
| End date: | February 29, 2020 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Agreement: | Coordination of Improvement of Higher Education Personnel (CAPES) |
| Principal Investigator: | Francisco Carlos Barbosa Maia |
| Grantee: | Flávio Henrique Feres |
| Host Institution: | Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Campinas , SP, Brazil |
Abstract The light-matter interaction in two-dimensional photonics crystals occur, primarily, via formation of polaritons, quasi-particules with sub-drifractional wavelength associated to material resonances like vibrations and free charge waves. In this investigation, we will study plasmons-polaritons of graphene (G), phonon-polaritons of hexagonal boron nitride (hBN) and theplasmon-phonon-polariton hybridization the G-hBN heterostructure. Particularly, we will concentrate on the photonic properties of those polaritons created by stacking n layers of G-hBN[(G-hBN)n]. This investigation will be done using the nano-FTIR technique that, conceptually, derived from the Scattering-Scanning Near Field Optical Microscopy (sSNOM). In nano-FTIR, the large-band infrared radiation from the Brazilian Synchrotron Laboratory (LNLS) is focused at metallic coated tip (an atomic force microscope tip with radius ~25 nm) of the near field microscope. As a result, an evanescent optical field - the near-field -rises confined in the tip apex that is, then, transformed in to an broadband excitation source of 25 nm spatial resolution. Recently, we have succeeded at employing nano-FTIR to study hybrids polaritons in different systems of G-hBN. For the (G-hBN)n multilayer, we foresee to achieve control of the in- and out-of-plane polaritons associated waves by manipulating the number ofhBN layers. To that end, important photonic phenomena as wave interference and plasmon-phonon coupling will be addressed. Polarization control can also be obtained by choosing the substrate: a metallic substrate privileges out-of-plane hBN modes, while in-plane polarized modes are favored on dielectric substrates. This work will produce the first master-degree dissertation in nano-FTIR and presents directly impact on understanding of nanophotonics and heterostructures 2D. (AU) | |
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