Imaging Anisotropic Waveguide Exciton Polaritons in Tin Sulfide
| Autor: | Yilong Luan, Hamidreza Zobeiri, Xinwei Wang, Eli Sutter, Peter Sutter, Zhe Fei |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Materials Science Bioengineering General Chemistry Condensed Matter Physics Optics (physics.optics) Physics - Optics |
| Popis: | In recent years, novel materials supporting in-plane anisotropic polaritons have attracted a lot of research interest due to their capability of shaping nanoscale field distributions and controlling nanophotonic energy flows. Here we report a nano-optical imaging study of waveguide exciton polaritons (EPs) in tin sulfide (SnS) in the near-infrared (IR) region using the scattering-type scanning near-field optical microscopy (s-SNOM). With s-SNOM, we mapped in real space the propagative EPs in SnS, which show sensitive dependence on the excitation energy and sample thickness. Moreover, we found that both the polariton wavelength and propagation length are anisotropic in the sample plane. In particular, in a narrow spectral range from 1.32 to 1.44 eV, the EPs demonstrate quasi-one-dimensional propagation, which is rarely seen in natural polaritonic materials. Further analysis indicates that the observed polariton anisotropy is originated from the different optical bandgaps and exciton binding energies along the two principal crystal axes of SnS. 21 pages |
| Databáze: | OpenAIRE |
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