Optical waveguides are vital components of data communication system technologies, but their scaling down to the nanoscale has remained challenging despite advances in nano-optics and nanomaterials. Recently, we theoretically predicted that the ultimate limit of visible photon guiding can be achieved in monolayer-thick transition metal dichalcogenides. Here, we present an experimental demonstration of light guiding in an atomically thick tungsten disulfide membrane patterned as a photonic crystal structure. In this scheme, two-dimensional tungsten disulfide excitonic photoluminescence couples into quasi-guided photonic crystal modes known as resonant-type Wood’s anomalies. These modes propagate via total internal reflection with only a small portion of the light diffracted to the far field. Such light guiding at the ultimate limit provides more possibilities to miniaturize optoelectronic devices and to test fundamental physical concepts.
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This work was partially supported by the National Science Foundation (NSF) under the NSF 2-DARE Program (EFMA-1542879 and EFMA-1542863) and DMR-1709996. We thank R. Agarwal and R. Bratschitsch for useful discussions during the early stages of this work.
The authors declare no competing interests.
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Supplementary Sections 1–18, Supplementary Figs. 1–25, Supplementary Refs. 1–36.