Transition Metal Dichalcogenide Nanoantennas Lattice
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.357
Transition Metal Dichalcogenide Nanoantennas Lattice Viktoriia E. Babicheva University of New Mexico, Albuquerque, NM
ABSTRACT
High-index materials such as silicon and III-V compounds have recently gained a lot of interest as a promising material platform for efficient photonic nanostructures. Because of the high refractive index, nanoparticles of such materials support Mie resonances and enable efficient light control and its confinement at the nanoscale. Here we propose a design of nanostructure with multipole resonances where optical nanoantennas are made out of transition metal dichalcogenide, in particular, tungsten disulfide WS2. Transition metal dichalcogenide (TMDCs) possess a high refractive index and strong optical anisotropy because of their layered structure and are promising building blocks for next-generation photonic devices. Strong anisotropic response results in different components of TMDC permittivity and the possibility of tailoring nanostructure optical properties by choosing different axes and adjusting dimensions in design. The proposed periodic array of TMDC nanoantennas can be used for controlling optical resonances in the visible and near-infrared spectral ranges and engineering efficient ultra-thin optical components with nanoscale light confinement.
INTRODUCTION Traditional high-refractive-index materials, including silicon, germanium, and III-V compounds, have been a subject of numerous studies as they enable tight mode confinement within the nanostructure [1-9]. Mie resonances in single nanoparticles and periodic arrays of such materials are well understood, experimentally demonstrated, and strongly benefit from utilizing established nanofabrication processes [10-19]. However, recently emerged layered materials such as transition metal dichalcogenides, hexagonal
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boron nitride, and black phosphorus may provide a number of advantages for photonic applications owing to their high optical anisotropy, strong nonlinear response, and layered structure [20-26]. With very few exceptions, the possibility to design nanoantennas, metasurfaces, and optical components out of layered materials remained overlooked and only now gets appropriate attention [27]. In this work we show that one can use cuboid 200x200x200 nm3 nanoantennas of TMDC material, in particular, tungsten disulfide WS2, to excite optical resonances in the visible and near-infrared spectral ranges. We show that the resonances in the nanoantenna array can be controlled by the dimensions of the lattice, and that response on the changes of different mutually orthogonal periods is different if incident light polarization is fixed. RESULT In this work, we study a periodic rectangular array of cuboid TMDC nanoantennas sur
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