Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas

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 in the quantum efficiency of the emitters coupled to the nano-antennas. This further allowed 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.

References in corpus (7)

• Irradiation of Nanostrained Monolayer WSe${}_2$ for Site-Controlled Single-Photon Emission up to 150 K
• Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
• Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
• Scalable single-photon sources in atomically thin MoS2
• Electrical control of single-photon emission in highly-charged individual colloidal quantum dots
• Auger recombination of dark excitons in $\mathrm{W}{\mathrm{S}}_2$ and $\mathrm{WS}{\mathrm{e}}_2$ monolayers
• Dielectric nano-antennas for strain engineering in atomically thin two-dimensional semiconductors

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