Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps

Abstract

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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Cited by in corpus (5)

• Van der Waals Materials for Applications in Nanophotonics
• Van der Waals Nanoantennas on Gold as Hosts for Hybrid Mie-Plasmonic Resonances
• Interface second harmonic generation enhancement in hetero-bilayer van der Waals nanoantennas
• Realization of Z${}_2$ topological photonic insulators made from multilayer transition metal dichalcogenides
• Light-matter interactions in layered materials and heterostructures: from moiré physics and magneto-optical effects to ultrafast dynamics and hybrid meta-photonics