Simultaneous observation of bright and dark polariton states in subwavelength gratings made from quasi-bulk WS 2
Year: 2025
Type: article
Abstract: Over the last decade, layered crystals, referred to as van der Waals (vdW) materials, have attracted tremendous interest due to their unique properties in their single and few layer forms. Their bulk counterparts, however, have only been recently explored as building blocks for nanophotonics. Indeed, bulk vdW materials offer promising properties such as high refractive indices and adherence to any type of substrate. We present here a variety of 1D grating structures composed of bulk transition metal dichalcogenide (TMD) WS 2 as a highly tunable and versatile platform for observation of a multi-level polaritonic system. The WS 2 excitons are simultaneously strongly coupled with the two grating photonic modes, including the bound state in the continuum (BIC) of the lower energy mode, giving rise to polariton-BICs. The polaritonic dispersion shapes can be varied in a straightforward fashion by choosing WS 2 films of different thicknesses and changing the gratings periods.
Source: Optics Express
DOI: 10.1364/oe.553437
Authors: Paul Bouteyre, Xuerong Hu, Sam A. Randerson, Panaiot G. Zotev, Yue Wang, Alexander I. Tartakovskii
Institution: University of York
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G1159943537, Quantum and Many Body Physics Enabled by Advanced Semiconductor Nanotechnology, Light-matter interactions and quantum photonics in nano-scale semiconductor structures and devices, Near-Field Optical Spectroscopy Centre at Sheffield, NOSC, Quantum Materials by Twistronics, MISSION (Mid- Infrared Silicon Photonic Sensors for Healthcare and Environmental Monitoring)
OpenAlex ID: W4409370782