Hyperspectral Nanoimaging of van der Waals Polaritonic Crystals

Hyperspectral Nanoimaging of van der Waals Polaritonic Crystals

Phonon polaritons (PhPs) in van der Waals (vdW) crystal slabs enable nanoscale infrared light manipulation. Specifically, periodically structured vdW slabs behave as polaritonic crystals (vdW-PCs), where the polaritons form Bloch modes. Because the polariton wavelengths are smaller than that of ligh...

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Veröffentlicht in:Nano letters 2021-09, Vol.21 (17), p.7109-7115
Hauptverfasser: Alfaro-Mozaz, F. J, Rodrigo, S. G, Vélez, S, Dolado, I, Govyadinov, A, Alonso-González, P, Casanova, F, Hueso, L. E, Martín-Moreno, L, Hillenbrand, R, Nikitin, A. Y
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container_end_page 7115
container_issue 17
container_start_page 7109
container_title Nano letters
container_volume 21
creator Alfaro-Mozaz, F. J
Rodrigo, S. G
Vélez, S
Dolado, I
Govyadinov, A
Alonso-González, P
Casanova, F
Hueso, L. E
Martín-Moreno, L
Hillenbrand, R
Nikitin, A. Y
description Phonon polaritons (PhPs) in van der Waals (vdW) crystal slabs enable nanoscale infrared light manipulation. Specifically, periodically structured vdW slabs behave as polaritonic crystals (vdW-PCs), where the polaritons form Bloch modes. Because the polariton wavelengths are smaller than that of light, conventional far-field spectroscopy does not allow for a complete characterization of vdW-PCs or for revealing their band structure. Here, we perform hyperspectral infrared nanoimaging and analysis of PhPs in a vdW-PC slab made of h-BN. We demonstrate that infrared spectra recorded at individual spatial positions within the unit cell of the vdW-PC can be associated with its band structure and local density of photonic states (LDOS). We thus introduce hyperspectral infrared nanoimaging as a tool for the comprehensive analysis of polaritonic crystals, which could find applications in the reconstruction of complex polaritonic dispersion surfaces in momentum-frequency space or for exploring exotic electromagnetic modes in topological photonic structures.
doi_str_mv 10.1021/acs.nanolett.1c01452
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