Can I read Terahertz Twistoptics -- engineering canalized phonon polaritons on EtoBox?

Terahertz Twistoptics -- engineering canalized phonon polaritons by Obst, Maximilian; Nörenberg, Tobias; Álvarez-Pérez, Gonzalo; de Oliveira, Thales V. A. G.; Taboada-Gutiérrez, Javier; Feres, Flávio H.; Kaps, Felix G.; Hatem, Osama; Luferau, Andrei; Nikitin, Alexey Y.; Klopf, J. Michael; Alonso-González, Pablo; Kehr, Susanne C.; Eng, Lukas M. is a scholarly article available to read on EtoBox.

What is Terahertz Twistoptics -- engineering canalized phonon polaritons about?

The terahertz (THz) frequency range is key to study collective excitations in many crystals and organic molecules. However, due to the large wavelength of THz radiation, the local probing of these excitations in smaller crystalline structures or few-molecular arrangements, requires sophisticated methods to confine THz light down to the nanometer length scale, as well as to manipulate such a confined radiation. For this purpose, in recent years, taking advantage of hyperbolic phonon polaritons (HPhP) in highly anisotropic van der Waals (vdW) materials has emerged as a promising approach, offering a multitude of manipulation options such as control over the wavefront shape and propagation direction. Here, we demonstrate the first THz application of twist-angle-induced HPhP manipulation, designing the propagation of confined THz radiation between 8.39 and 8.98 THz in the vdW material alpha-molybdenum trioxide ($\alpha-MoO_{3}$), hence extending twistoptics to this intriguing frequency range. Our images, recorded by near-field optical microscopy, show the frequency- and twist-angle-dependent change between hyperbolic and elliptic polariton propagation, revealing a polaritonic transitio

Author

Obst, Maximilian; Nörenberg, Tobias; Álvarez-Pérez, Gonzalo; de Oliveira, Thales V. A. G.; Taboada-Gutiérrez, Javier; Feres, Flávio H.; Kaps, Felix G.; Hatem, Osama; Luferau, Andrei; Nikitin, Alexey Y.; Klopf, J. Michael; Alonso-González, Pablo; Kehr, Susanne C.; Eng, Lukas M.

Published

2023

Language

EN