An ultra-thin transition metal dichalcogenide (TMDC) layer can support guided exciton-polariton modes due to the strong coupling between excitons and photons. Herein, we report the guided mode resonance in an ultra-thin TMDC grating structure. Owing to the strong exciton resonances in TMDCs, a TMDC grating structure shows guided-mode resonance even at a thickness limit of ∼10 nm and is capable of realizing polaritonic dispersion in a monolithic grating structure. We investigated the polarization and thickness dependence of the optical dispersion relations of the tungsten disulfide (WS2) grating structure. In addition, we confirmed that the monolithic WS2 grating coupler can be used to couple the near-field guided exciton-polariton out into the far field. We believe that ultra-thin TMDC layers can facilitate sub-wavelength nanophotonic applications.
Bibliographical noteFunding Information:
Research funding: This work was supported by the National Research Foundation of Korea (NRF-2019R1A2C2003313, NRF-2022R1A4A1034315) and National R & D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2021M3F3A2A03017083). We acknowledge support provided by Samsung Science and Technology Foundation (SSTF-BA1902-03) and a Korea University Grant.
© 2023 the author(s), published by De Gruyter, Berlin/Boston.
- 1D photonic crystal
- grating coupler
- guided mode resonance
- transition metal dichalcogenide
- tungsten disulfide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering