Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
Year: 2021
Type: article
Abstract: Single photon emitters in atomically-thin semiconductors can be deterministically positioned using strain induced by underlying nano-structures. Here, we couple monolayer WSe 2 to high-refractive-index gallium phosphide dielectric nano-antennas providing both optical enhancement and monolayer deformation. For single photon emitters formed on such nano-antennas, we find very low (femto-Joule) saturation pulse energies and up to 10 4 times brighter photoluminescence than in WSe 2 placed on low-refractive-index SiO 2 pillars. We show that the key to these observations is the increase on average by a factor of 5 of the quantum efficiency of the emitters coupled to the nano-antennas. This further allows us to gain new insights into their photoluminescence dynamics, revealing the roles of the dark exciton reservoir and Auger processes. We also find that the coherence time of such emitters is limited by intrinsic dephasing processes. Our work establishes dielectric nano-antennas as a platform for high-efficiency quantum light generation in monolayer semiconductors.
Source: Nature Communications
Authors: Luca Sortino, Panaiot G. Zotev, Catherine L. Phillips, Alistair J. Brash, Javier Cambiasso, Elena Marensi, A. Mark Fox, Stefan A. Maier, Riccardo Sapienza, Alexander I. Tartakovskii
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,560
Awards: EXC 2089: econversion, G1820739482, G2115222242, G2142062558, G2457300166, G258225891, G2985810681, G3341840505, Light-matter interactions and quantum photonics in nano-scale semiconductor structures and devices, G357814554, G3764765484, G4206460352, G434337789, G4451712941, G4613448559, G4672599647, Semiconductor Quantum Photonics: Control of Spin, Exciton and Photon Interactions by Nano-Photonic Design, Graphene Flagship Core Project 3, G5256181487, Quantum Materials by Twistronics, G6196935697, The Royce: Capitalising on the investment, G7116980227, G7393418935, Nanoscale sculpturing of single photons with dielectrics, Sir Henry Royce Institute - Imperial Build and Equipment, Sir Henry Royce InsStitute - recurrent grant, Novel Quantum Emitters monolithically grown on Si, Ge and III-V substrates, Nanoscale solid-state spin systems in emerging quantum technologies, G8981784078
OpenAlex ID: W3144623076