SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Poster Session III: Poster to Mini-Symposium: Infrared nano-optics I
O 40.4: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Infrared-to-THz near-field nanoscopy with the free-electron laser FELBE — •Lukas Wehmeier1,3, Tobias Nörenberg1,3, Thales V.A.G. de Oliveira1,2, J. Michael Klopf2, Lukas M. Eng1,3, and Susanne C. Kehr1 — 1Technische Universität Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Germany — 3ct.qmat, Dresden-Würzburg Cluster of Excellence - EXC 2147, Technische Universität Dresden, Germany
Panelist: Infrared nanoscopy of 2D materials, metamaterials, and optical nano-structures is often limited by the wavelength range provided by table-top laser sources. Radiation from the tunable narrow-band free-electron laser FELBE (Dresden, Germany) uniquely enables near-field nanoscopy over the broad spectral range from 5 to 250 µm (i.e. 1.2 - 60 THz), particularly covering also the so-called THz gap [1-7]. I will present intriguing applications of FELBE in IR-optical nanoscopy by demonstrating extreme field confinement, anisotropic dispersion tracking, and resonant phenomena of THz polaritons in van der Waals crystals [1], nano-structures [2,3] and functional perovskite oxides [4-8].
[1] T.V.A.G. de Oliveira et al., Advanced Materials 33, 2005777 (2021).
[2] D. Lang et al., Nanotechnology 30, 084003 (2018).
[3] F.H. Feres et al., submitted.
[4] J. Döring et al., Nanoscale 10, 18074 (2018).
[5] L. Wehmeier et al., Phys. Rev. B 100, 035444 (2019).
[6] L. Wehmeier et al., Appl. Phys. Lett. 116, 071103 (2020).
[7] S.C. Kehr et al., Nat. Commun. 2, 249 (2011).
[8] H. Aminpour et al., Opt. Express 28, 32316 (2020).