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

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: NATURE COMMUNICATIONS; v. 12, n. 1 MAR 31 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 19/14017-9 - De ondas de éxcitons a THz-fônons: a nano-óptica de materiais 2Ds via nanoespectroscopia de infravermelho síncrotron
• Beneficiário: Raul de Oliveira Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 19/08818-9 - Modulação de amplitude de poláritons por barreiras dielétricas bidimensionais sob a luz da nanoespectroscopia de infravermelho síncrotron
• Beneficiário: Rafael Alves Mayer
• Modalidade de apoio: Bolsas no Brasil - Mestrado