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

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

doi:10.1039/d5nr02966j

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

Journal Article · Mon Sep 29 00:00:00 EDT 2025 · Nanoscale

DOI:https://doi.org/10.1039/d5nr02966j· OSTI ID:2997744

^[1]; ^[2]; Chen, Shu ^[3]; Mazzotti, Victor ^[4]; ^[4]; ^[5]; ^[6]; ^[7]; Nörenberg, Tobias ^[5]; ^[8]; ^[9]; ^[5]; ^[5]; ^[10]; ^[11]; ^[2]; ^[2]

Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); Technische Universität Dresden (Germany)
Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS)
University of Shanghai for Science and Technology (China)
Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); University of Campinas (UNICAMP), Sao Paulo (Brazil)
Technische Universität Dresden (Germany)
Technische Universität Dresden (Germany); Tanta University (Egypt)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
State University of Santa Cruz, Iheus (Brazil)
Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Germany)
Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil); Universidade Federal de Mato Grosso, Cuiabá (Brazil)
University of the Basque Country, Donostia (Spain); Basque Foundation for Science, Bilbao (Spain). IKERBASQUE

Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2997744

Report Number(s):: BNL--229020-2025-JAAM

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 41 Vol. 17; ISSN 2040-3364; ISSN 2040-3372

Publisher:: Royal Society of Chemistry (RSC)Copyright Statement

Country of Publication:: United States

Language:: English

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