Two-dimensional talc as a natural abundant ultra-broadband hyperbolic material

Flávio H. Feres; Francisco C. B. Maia; Shu Chen; Victor Mazzotti; Rafael A. Mayer; Maximilian Obst; Osama Hatem; Lukas Wehmeier; Tobias Nörenberg; Matheus S. Queiroz; J. Michael Klopf; Susanne C. Kehr; Lukas M. Eng; Alisson R. Cadore; Rainer Hillenbrand; Raul O. Freitas; Ingrid D. Barcelos

doi:10.1039/D5NR02966J

Two-dimensional talc as a natural abundant ultra-broadband hyperbolic material

Flávio H. Feres,

†*^ae Francisco C. B. Maia,

†^a Shu Chen,^b Victor Mazzotti,^ac Rafael A. Mayer,

^ad Maximilian Obst,

^e Osama Hatem,

^ef Lukas Wehmeier,

^g Tobias Nörenberg,^e Matheus S. Queiroz,

^h J. Michael Klopf,

ⁱ Susanne C. Kehr,

^e Lukas M. Eng,

^e Alisson R. Cadore,

^jk Rainer Hillenbrand,

^lm Raul O. Freitas

^a and Ingrid D. Barcelos

*^a

Author affiliations

* Corresponding authors

^a Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil
E-mail: ingrid.barcelos@lnls.br, flavio.feres@lnls.br

^b Terahertz Technology Innovation Research Institute, National Basic Science Center—Terahertz Science and Technology Frontier, Terahertz Precision Biomedical Discipline 111 Project, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China

^c Institute of Mathematics, Statistics and Scientific Computing, State University of Campinas (UNICAMP), Campinas, SP, Brazil

^d Institute of Physics Gleb Wataghin, State University of Campinas (UNICAMP), Campinas, SP, Brazil

^e Institute of Applied Physics, Technische Universität Dresden, Dresden 01062, Germany

^f Department of Engineering Physics, Faculty of Engineering, Tanta University, Tanta 31511, Egypt

^g National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, USA

^h Center for Research in Radiation Sciences and Technologies (CPqCTR), State University of Santa Cruz, Iheus, BA, Brazil

ⁱ Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany

^j Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil

^k Programa de Pós-Graduação em Física, Instituto de Física, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil

^l CIC nanoGUNE BRTA and Department of Electricity and Electronics at the University of the Basque Country (UPV/EHU), 20018 Donostia-San Sebastian, Spain

^m IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain

Abstract

We demonstrate that two-dimensional talc, a naturally abundant phyllosilicate mineral, supports hyperbolic phonon-polaritons (HPhPs) across the mid- and far-infrared wavelengths. Using scattering scanning near-field optical microscopy (s-SNOM) and synchrotron infrared nano-spectroscopy (SINS), we reveal tunable HPhP modes in talc flakes with long lifetimes, high confinement, and quality factors of up to 5. We further observe Fabry–Pérot cavity modes in tapered flakes, confirmed by simulations and analytical modeling. Compared to synthetic crystals, talc offers an ultra-broadband, low-cost, and sustainable platform for infrared nanophotonics and optoelectronics.

Nanoscale

Two-dimensional talc as a natural abundant ultra-broadband hyperbolic material

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