Imaging Anisotropic Waveguide Exciton Polaritons in Tin Sulfide

Luan, Yilong; Zobeiri, Hamidreza; Wang, Xinwei; Sutter, Eli; Sutter, Peter; Fei, Zhe

doi:10.1021/acs.nanolett.1c03833

Title: Imaging Anisotropic Waveguide Exciton Polaritons in Tin Sulfide

Journal Article · 07 February 2022 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.1c03833 · OSTI ID:1875274

Luan, Yilong ^[1]; Zobeiri, Hamidreza ^[1];

^[1];

^[2];

^[1]

Iowa State Univ., Ames, IA (United States)
Univ. of Nebraska, Lincoln, NE (United States)

In recent years, novel materials supporting in-plane anisotropic polaritons have attracted a great deal 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 (near-IR) region using 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. Here, a further analysis indicates that the observed polariton anisotropy originates from the different optical band gaps and exciton binding energies along the two principal crystal axes of SnS.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1875274

Report Number(s):: IS-J 10,712; CMMI-2032464; CBET-1930866; DMR-1904843; DMR-1945560

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 4 Vol. 22; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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77 NANOSCIENCE AND NANOTECHNOLOGY
anisotropy
exciton polaritons
quasi-one-dimensional
s-SNOM
tin sulfide
waveguide

Title: Imaging Anisotropic Waveguide Exciton Polaritons in Tin Sulfide

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References (42)

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