Enabling remote quantum emission in 2D semiconductors via porous metallic networks
arXiv:1912.07716 · doi:10.1038/s41467-019-13857-0
Abstract
The interaction between two-dimensional crystals (2DCs) and metals is ubiquitous in 2D material research. Here we report how 2DC overlayers influence the recrystallization of relatively thick metal films and the subsequent synergetic benefits this provides for coupling surface plasmon-polaritons (SPPs) to photon emission in 2D semiconductors. We show that annealing 2DC/Au films on SiO2 results in a 'reverse epitaxial' process where initially nanocrystalline Au films become highly textured and in close crystallographic registry to the 2D crystal overlayer. With continued annealing, the metal underlayer dewets to form an oriented pore enabled network (OPEN) film in which the 2DC overlayer remains suspended above or coats the inside of the metal pores. This OPEN film geometry supports SPPs launched by either direct laser excitation or by light emitted from the TMD semiconductor itself, where energy in-coupling and out-coupling occurs at the metal pore sites such that dielectric spacers between the metal and 2DC layer are unnecessary. At low temperatures a high density of single-photon emitters (SPEs) is present across an OPEN-WSe2 film, and we demonstrate non-local excitation of SPEs at a distance of 17 μm with minimal loss of photon purity. Our results suggest the OPEN film geometry is a versatile platform that could facilitate the use of layered materials in quantum optics systems.
arXiv comment15 pages, 4 figures
References in corpus (12)
- Large-scale quantum-emitter arrays in atomically thin semiconductors
- Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor
- Valley dynamics probed through charged and neutral exciton emission in monolayer WSe2
- Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
- Strain-induced spatial and spectral isolation of quantum emitters in mono- and bi-layer WSe2
- Deterministic coupling of site-controlled quantum emitters in monolayer semiconductors to plasmonic nanocavities
- Surface plasmons at single nanoholes in Au-films
- Synthesis of Epitaxial Single-Layer MoS on Au(111)
- Coupling single photons from discrete quantum emitters in WSe to lithographically defined plasmonic slot-waveguides
- Plasmon scattering from single sub-wavelength holes
- Coupling emission from single localized defects in 2D semiconductor to surface plasmon polaritons
- Coupling Quantum Emitters in WSe2 Monolayers to a Metal-Insulator-Metal Waveguide