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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sub-diffractional cavity modes of terahertz hyperbolic phonon polaritons in tin oxide

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Feres, Flavio H. [1, 2] ; Mayer, Rafael A. [1, 2] ; Wehmeier, Lukas [3, 4] ; Maia, Francisco C. B. [1] ; Viana, E. R. [5] ; Malachias, Angelo [6] ; Bechtel, Hans A. [7] ; Klopf, J. Michael [8] ; Eng, Lukas M. [3, 4] ; Kehr, Susanne C. [3] ; Gonzalez, J. C. ; Freitas, Raul O. [1] ; Barcelos, Ingrid D. [1]
Total Authors: 13
[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, Campinas, SP - Brazil
[2] Univ Campinas Unicamp, Gleb Wataghin Phys Inst, Phys Dept, Campinas, SP - Brazil
[3] Tech Univ Dresden, Inst Appl Phys, Dresden - Germany
[4] Tech Univ Dresden, Ct Qmat, Dresden Wurzburg Cluster Excellence EXC 2147, Dresden - Germany
[5] Univ Tecnol Fed Parana UTFPR, Dept Phys, Curitiba, PR - Brazil
[6] Univ Fed Minas Gerais UFMG, Dept Phys, Belo Horizonte, MG - Brazil
[7] Lawrence Berkeley Natl Lab, Adv Light Source ALS, Berkeley, CA - USA
[8] Helmholtz Zentrum Dresden Rossendorf, Inst Radiat Phys, Dresden - Germany
Total Affiliations: 8
Document type: Journal article
Source: NATURE COMMUNICATIONS; v. 12, n. 1 MAR 31 2021.
Web of Science Citations: 0

Hyperbolic phonon polaritons have recently attracted considerable attention in nanophotonics mostly due to their intrinsic strong electromagnetic field confinement, ultraslow polariton group velocities, and long lifetimes. Here we introduce tin oxide (SnO2) nanobelts as a photonic platform for the transport of surface and volume phonon polaritons in the mid- to far-infrared frequency range. This report brings a comprehensive description of the polaritonic properties of SnO2 as a nanometer-sized dielectric and also as an engineered material in the form of a waveguide. By combining accelerator-based IR-THz sources (synchrotron and free-electron laser) with s-SNOM, we employed nanoscale far-infrared hyper-spectral-imaging to uncover a Fabry-Perot cavity mechanism in SnO2 nanobelts via direct detection of phonon-polariton standing waves. Our experimental findings are accurately supported by notable convergence between theory and numerical simulations. Thus, the SnO2 is confirmed as a natural hyperbolic material with unique photonic properties essential for future applications involving subdiffractional light traffic and detection in the far-infrared range. Systems that help to enable nanophotonics in the terahertz region are in demand for developing technologies. The authors introduce and study the photonic properties of tin oxide nanobelts as such a platform, supporting phonon polaritons in the far-IR range. (AU)

FAPESP's process: 19/14017-9 - From excitons waves to THz-phonons: 2Ds materials nano-optics via synchrotron infrared nanospectroscopy
Grantee:Raul de Oliveira Freitas
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 19/08818-9 - Modulation of polaritons amplitude by two-dimensional dielectric junctions in the light of synchrotron infrared nanospectroscopy
Grantee:Rafael Alves Mayer
Support Opportunities: Scholarships in Brazil - Master