Exciton-dielectric mode coupling in MoS<sub>2</sub> nanoflakes visualized by cathodoluminescence
نویسندگان
چکیده
Abstract Two-dimensional (2D) transition metal dichalcogenides (TMDCs), possessing unique exciton luminescence properties, have attracted significant attention for use in optical and electrical devices. TMDCs are also high refractive index materials that can strongly confine the electromagnetic field nanoscale dimensions when patterned into nanostructures, thus resulting complex light emission includes dielectric resonances. Here, we cathodoluminescence (CL) to experimentally visualize modes of single molybdenum disulfide (MoS 2 ) nanoflakes investigate enhancement due resonances dimensions, by using a scanning transmission electron microscope. Specifically, identify whose resonant wavelength is sensitive shape size nanoflake, peaks energies insensitive geometry flakes. Using four-dimensional CL method boundary element simulations, further theoretically polarization angular patterns, revealing coupling modes. Such nanoscopic observation provides detailed understanding responses MoS including modal couplings excitons which play crucial role development energy conversion devices, single-photon emitters, nanophotonic circuits with enhanced light-matter interactions.
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ژورنال
عنوان ژورنال: Nanophotonics
سال: 2022
ISSN: ['2192-8606', '2192-8614']
DOI: https://doi.org/10.1515/nanoph-2021-0643