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Cavity effect of the Phonon-Polaritons in Graphene-Hexagonal boron nitride two-dimensional heterostructure

Grant number: 18/05425-3
Support type:Scholarships in Brazil - Master
Effective date (Start): July 01, 2018
Effective date (End): February 29, 2020
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Francisco Carlos Barbosa Maia
Grantee:Flávio Henrique Feres
Home Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). Campinas , SP, Brazil


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)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FERES, FLAVIO H.; MAYER, RAFAEL A.; BARCELOS, INGRID D.; FREITAS, RAUL O.; MAIA, FRANCISCO C. B. Acceleration of Subwavelength Polaritons by Engineering Dielectric-Metallic Substrates. ACS PHOTONICS, v. 7, n. 6, p. 1396-1402, JUN 17 2020. Web of Science Citations: 0.
FERES, FLAVIO H.; BARCELOS, INGRID D.; MAYER, RAFAEL A.; DOS SANTOS, THIAGO M.; FREITAS, RAUL O.; RASCHKE, MARKUS B.; BAHAMON, DARIO A.; MAIA, FRANCISCO C. B. Dipole modelling for a robust description of subdiffractional polariton waves. NANOSCALE, v. 11, n. 44, p. 21218-21226, NOV 28 2019. Web of Science Citations: 0.

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