Abstract
Two-dimensional (2D) monolayer-thick materials with a direct bandgap, such as MoS2, WSe2, and other transition metal dichalcogenides (TMDCs), are being actively explored for future nanophotonic applications in the visible and UV ranges. Here I show that a monolayer of TMDCs is capable of supporting a guided optical mode below the exciton resonance—a 2D exciton–polariton. I evaluate the characteristics of these guided modes and conditions required for their existence, including derivations of mode dispersion relations, mode confinements, and propagation lengths. The visible or near-IR mode is confined to within roughly a micrometer of the monolayer and has a propagation length exceeding 100 μm. This light guiding ability in the visible and IR ranges makes TMDC monolayers a versatile and potentially attractive platform for future optoelectronic devices.
Highlights
A monolayer-thick two dimensional material have become objects of intense studies due to their potential applications in electronics and optics [1, 2]
Tangential component of magnetic field is subject to the Maxwell equation ∂Hz / ∂x =iωPy, and integrating it along the contour δ l encompassing transition metal dichalcogenides (TMDC) monolayer yields a boundary condition
The t2D susceptibility in (3) is directly related absorption by the TMDC monolayer of the harmonic wave propagating in the direction normal to it (Fig.1b)
Summary
A monolayer-thick two dimensional material have become objects of intense studies due to their potential applications in electronics and optics [1, 2]. Tangential component of magnetic field is subject to the Maxwell equation ∂Hz / ∂x =iωPy , and integrating it along the contour δ l encompassing TMDC monolayer yields a boundary condition The t2D susceptibility in (3) is directly related absorption by the TMDC monolayer of the harmonic wave propagating in the direction normal to it (Fig.1b).
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