| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Nanoscale-confined and low-loss terahertz phonon polaritons in a hyperbolic van der Waals crystal | Thales V. A. G. de Oliveira
; Tobias Nörenberg
; Gonzalo Álvarez-Pérez
; Lukas Wehmeier
; Javier Taboada-Gutiérrez
; Maximilian Obst
; Franz Hempel
; Eduardo J.H. Lee
; John M. Klopf
; Ion Errea
; Alexey Y. Nikitin
; Susanne C. Kehr
; Pablo Alonso-Gonzaléz
; Lukas M. Eng
; | Date: |
13 Jul 2020 | Abstract: | Electromagnetic field confinement is crucial for nanophotonic technologies,
since it allows for enhancing light-matter interactions, thus enabling light
manipulation in deep sub-wavelength scales. In the terahertz (THz) spectral
range, radiation confinement is conventionally achieved with specially designed
metallic structures - such as antennas or nanoslits - with large footprints due
to the rather long wavelengths of THz radiation. In this context, phonon
polaritons - light coupled to lattice vibrations - in van der Waals (vdW)
crystals have emerged as a promising solution for controlling light beyond the
diffraction limit, as they feature extreme field confinements and low optical
losses. However, experimental demonstration of nanoscale-confined phonon
polaritons at THz frequencies has so far remained elusive. Here, we provide it
by employing scattering-type scanning near-field optical microscopy (s-SNOM)
combined with a free-electron laser (FEL) to reveal a range of low-loss
polaritonic excitations at frequencies from 8 to 12 THz in the vdW
semiconductor {alpha}-$MoO_3$. We visualize THz polaritons with i) in-plane
hyperbolic dispersion, ii) extreme nanoscale field confinement (below
${lambda}_o$/75) and iii) long polariton lifetimes, with a lower limit of > 2
ps. | Source: | arXiv, 2007.6342 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |