具有超小间隙的过渡金属二硫化物二聚体纳米天线
Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps
AI总结：
本文利用WS₂晶向各向异性制备双柱纳米天线，通过Mie共振将WSe₂单层荧光增强至240倍，并以AFM后处理实现10±5 nm超小间隙。
摘要：
过渡金属二硫化物因其高折射率、在可见光谱很大范围内的低吸收以及与多种基底的兼容性，已成为纳米光子谐振器的理想材料。本文利用这些特性，借助晶体结构的各向异性，制备了多种几何形状的WS₂双柱纳米天线。通过暗场光谱，我们揭示了多个Mie共振，并将WSe₂单层光致发光与之耦合，实现Purcell增强及最高达240倍的荧光增强。我们提出了制备后利用原子力显微镜对二聚体纳米天线进行重新定位和旋转的方法，获得了小至10±5 nm的间隙，为包括单光子发射体的强Purcell增强和光镊在内的一系列潜在应用开辟了可能，并在模拟中对这些应用进行了研究。我们的发现通过探索过渡金属二硫化物独特性质所带来的新应用，凸显了其在纳米光子学中的优势。
英文摘要：
Transition metal dichalcogenides have emerged as promising materials for nano-photonic resonators due to their large refractive index, low absorption within a large portion of the visible spectrum and compatibility with a wide range of substrates. Here we use these properties to fabricate WS$_2$ double-pillar nano-antennas in a variety of geometries enabled by the anisotropy in the crystal structure. Using dark field spectroscopy, we reveal multiple Mie resonances, to which we couple WSe$_2$ monolayer photoluminescence and achieve Purcell enhancement and an increased fluorescence by factors up to 240. We introduce post-fabrication atomic force microscope repositioning and rotation of dimer nano-antennas, achieving gaps as small as 10$\pm$5 nm, opening the possibility to a host of potential applications including strong Purcell enhancement of single photon emitters and optical trapping, which we study in simulations. Our findings highlight the advantages of using transition metal dichalcogenides for nano-photonics by exploring new applications enabled by their unique properties.
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