Detail publikace

Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons

Chen, S. Leng, PL. Konecná, A. Modin, E. Gutierrez-Amigo, M. Vicentini, E. Martín-García, B. Barra-Burillo, M. Niehues I. Escudero, CM. Xie, XY. Hueso, LE. Artacho, E. Aizpurua, J. Errea, I. Vergniory, MG. Chuvilin, A. Xiu, FX. Hillenbrand, R.

Originální název

Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Thin layers of in-plane anisotropic materials can support ultraconfined polaritons, whose wavelengths depend on the propagation direction. Such polaritons hold potential for the exploration of fundamental material properties and the development of novel nanophotonic devices. However, the real-space observation of ultraconfined in-plane anisotropic plasmon polaritons (PPs)-which exist in much broader spectral ranges than phonon polaritons-has been elusive. Here we apply terahertz nanoscopy to image in-plane anisotropic low-energy PPs in monoclinic Ag2Te platelets. The hybridization of the PPs with their mirror image-by placing the platelets above a Au layer-increases the direction-dependent relative polariton propagation length and the directional polariton confinement. This allows for verifying a linear dispersion and elliptical isofrequency contour in momentum space, revealing in-plane anisotropic acoustic terahertz PPs. Our work shows high-symmetry (elliptical) polaritons on low-symmetry (monoclinic) crystals and demonstrates the use of terahertz PPs for local measurements of anisotropic charge carrier masses and damping. Employing terahertz nanoscopy, we image highly confined, in-plane anisotropic acoustic terahertz plasmon polaritons in monoclinic Ag2Te platelets placed above a Au layer, verifying a linear dispersion and elliptical isofrequency contour in momentum space.

Klíčová slova

THZ, crystals

Autoři

Chen, S.; Leng, PL.; Konecná, A.; Modin, E.; Gutierrez-Amigo, M.; Vicentini, E.; Martín-García, B.; Barra-Burillo, M.; Niehues I.; Escudero, CM.; Xie, XY.; Hueso, LE.; Artacho, E.; Aizpurua, J.; Errea, I.; Vergniory, MG.; Chuvilin, A.; Xiu, FX.; Hillenbrand, R.

Vydáno

1. 7. 2023

Nakladatel

NATURE PORTFOLIO

Místo

BERLIN

ISSN

1476-4660

Periodikum

Nature Materials

Ročník

22

Číslo

7

Stát

Spojené království Velké Británie a Severního Irska

Strany počet

9

URL

https://www.nature.com/articles/s41563-023-01547-8

BibTex

@article{BUT185396,
  author="Chen, S. and Leng, PL. and Konecná, A. and Modin, E. and Gutierrez-Amigo, M. and Vicentini, E. and Martín-García, B. and Barra-Burillo, M. and Niehues I. and Escudero, CM. and Xie, XY. and Hueso, LE. and Artacho, E. and Aizpurua, J. and Errea, I. and Vergniory, MG. and Chuvilin, A. and Xiu, FX. and Hillenbrand, R.",
  title="Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons",
  journal="Nature Materials",
  year="2023",
  volume="22",
  number="7",
  pages="9",
  doi="10.1038/s41563-023-01547-8",
  issn="1476-4660",
  url="https://www.nature.com/articles/s41563-023-01547-8"
}