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Paratellurite Nanowires as a Versatile Material for THz Phonon Polaritons

Journal Article · · ACS Photonics
 [1];  [2];  [3];  [4];  [1];  [5];  [6];  [6];  [7];  [8];  [9];  [9];  [10];  [11];  [6];  [6];  [5];  [5]
  1. Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
  2. Technische Universität Dresden (Germany); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Stony Brook Univ., NY (United States)
  3. Instituto Militar de Engenharia (IME), Rio de Janeiro (Brazil)
  4. Stony Brook Univ., NY (United States)
  5. Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS)
  6. Technische Universität Dresden (Germany)
  7. Technische Universität Dresden (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  8. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  9. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  10. Universidade Federal de Minas Gerais, Belo Horizonte (Brazil)
  11. Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba (Brazil)

Polaritons, i.e., hybrid quasi-particles of light and matter resonances, have been extensively investigated due to their potential to enhance light-matter interactions. Although polaritonic applications thrive in the mid-infrared range, their extension to the terahertz (THz) range remains limited. Here, we present paratellurite (α-TeO2) nanowires, a versatile material acting as a platform for different types of phonon polaritons. Utilizing synchrotron infrared nanospectroscopy from 10 to 24 THz, we uncover the polaritonic properties of α-TeO2 nanowires, showcasing their dual functionality as both a Fabry-Pérot cavity and a waveguide for surface phonon polaritons. Furthermore, near-field measurements with a free-electron laser as a THz source reveal a localized optical contrast down to 5.5 THz, an indication of hyperbolic bands. In conclusion, our findings complement the repertoire of polaritonic materials, with significant implications for advancing THz technologies.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); Fundaç̧ão de Amparo á Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundaç̧ão de Amparo á Pesquisa do Estado de Minas Gerais (FAPEMIG)
Grant/Contract Number:
AC02-05CH11231; SC0012704
OSTI ID:
2476813
Alternate ID(s):
OSTI ID: 2506712
Journal Information:
ACS Photonics, Journal Name: ACS Photonics Journal Issue: 10 Vol. 11; ISSN 2330-4022
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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