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Modulation of polaritons amplitude by two-dimensional dielectric junctions in the light of synchrotron infrared nanospectroscopy

Grant number: 19/08818-9
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2019
Effective date (End): February 28, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Raul de Oliveira Freitas
Grantee:Rafael Alves Mayer
Home Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). Campinas , SP, Brazil


Two-dimensional materials (2Ds) represent one of the greatest advances in material science and engineering in the last decade and have the potential to remain relevant for at least another decade. Currently, it is possible to find specific options of 2Ds for each modern technological application, since a vast catalog of these covers from ultra-thin semiconductors with varied band gaps (Black Phosphorus and Transition Metals Dichalcogenides) to atomically thin semimetals (graphene) and ultra-flat insulators (hexagonal Boron Nitride, Talc), among others. Among these, 2Ds polar crystals, such as hexagonal Boron Nitride (hBN), have presented extraordinary properties in the confinement and transport of light at the nanoscale, being today the most promising material for the development of nano-photonic devices. This Master's project will investigate light transport properties in nanometer waveguides composed of hBN and graphene in an architecture in which it will be possible to regulate the mid-IR polaritons waves amplitude in hBN by the tuning of the Fermi level of the graphene. For this, the project will provide numerical modeling, fabrication and characterization by Synchrotron Infrared Nanospectroscopy of an amplitude modulator based on hBN-graphene-hBN. These modulators are already theoretically foreseen in the literature, however, there is no experimental proof. The main objective of this proposal is to experimentally develop this modulator. The project will be held at the Brazilian Synchrotron Light Laboratory in collaboration with the University of Minnesota and Unicamp. (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.; WEHMEIER, LUKAS; MAIA, FRANCISCO C. B.; VIANA, E. R.; MALACHIAS, ANGELO; BECHTEL, HANS A.; KLOPF, J. MICHAEL; ENG, LUKAS M.; KEHR, SUSANNE C.; GONZALEZ, J. C.; FREITAS, RAUL O.; BARCELOS, INGRID D. Sub-diffractional cavity modes of terahertz hyperbolic phonon polaritons in tin oxide. NATURE COMMUNICATIONS, v. 12, n. 1 MAR 31 2021. Web of Science Citations: 0.
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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