Giant Optical Anisotropy in 2D Metal-Organic Chalcogenates
arxiv(2023)
摘要
Optical anisotropy is a fundamental attribute of some crystalline materials
and is quantified via birefringence. A birefringent crystal not only gives rise
to asymmetrical light propagation but also attenuation along two distinct
polarizations, a phenomenon called linear dichroism (LD). Two-dimensional (2D)
layered materials with high in- and out-of-plane anisotropy have garnered
interest in this regard. Mithrene, a 2D metal-organic chalcogenate (MOCHA)
compound, exhibits strong excitonic resonances due to its naturally occurring
multi-quantum well (MQW) structure and in-plane anisotropic response in the
blue wavelength ( 400-500 nm) regime. The MQW structure and the large
refractive indices of mithrene allow the hybridization of the excitons with
photons to form self-hybridized exciton-polaritons in mithrene crystals with
appropriate thicknesses. Here, we report the giant birefringence ( 1.01) and
tunable in-plane anisotropic response of mithrene, which stem from its low
symmetry crystal structure and unique excitonic properties. We show that the LD
in mithrene can be tuned by leveraging the anisotropic exciton-polariton
formation via the cavity coupling effect exhibiting giant in-plane LD ( 77.1
at room temperature. Our results indicate that mithrene is an ideal polaritonic
birefringent material for polarization-sensitive nanophotonic applications in
the short wavelength regime.
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