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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU149609" target="_blank" >RIV/00216305:26620/23:PU149609 - isvavai.cz</a>

Result on the web

<a href="https://www.nature.com/articles/s41563-023-01547-8" target="_blank" >https://www.nature.com/articles/s41563-023-01547-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41563-023-01547-8" target="_blank" >10.1038/s41563-023-01547-8</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GM23-05119M" target="_blank" >GM23-05119M: Shaped beams for a new era of electron microscopy and spectroscopy</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nature Materials

ISSN

1476-1122

e-ISSN

1476-4660

Volume of the periodical

22

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

„“-„“

UT code for WoS article

000981398300001

EID of the result in the Scopus database

2-s2.0-85158009242