2021
DOI: 10.1038/s41467-021-26262-3
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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 WSe2 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 104 times brighter photoluminescence than in WSe2 placed on low-refractive-index SiO2… Show more

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Cited by 62 publications
(57 citation statements)
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“…The second field is coupling TMD emitters into external waveguides for optoelectronic applications. [40,[60][61][62][63][64] It is crucial to accurately position the emitters with deterministic wavelengths for scalable and on-chip integration of photonic devices.…”
Section: Resultsmentioning
confidence: 99%
“…The second field is coupling TMD emitters into external waveguides for optoelectronic applications. [40,[60][61][62][63][64] It is crucial to accurately position the emitters with deterministic wavelengths for scalable and on-chip integration of photonic devices.…”
Section: Resultsmentioning
confidence: 99%
“…These methods of controlling the emission properties of single photon sources may prove useful for WSe 2 SPEs which form at high strain gradients in monolayers transferred onto dimer nanoantennas collocated with the electric field hotspots [53]. Previous reports have shown quantum efficiency enhancement for WSe 2 SPEs [11] as well as rotation of the emitter dipole moment due to a change in the strain gradient [54] both of which can be controlled through a decrease in separation and a rotation of individual nano-pillars in the dimer nano-antenna through AFM repositioning.…”
Section: Discussionmentioning
confidence: 97%
“…Transition metal dichalcogenides (TMDs) have drawn large scientific and technological interest in the past decade since the discovery of a direct band gap in monolayers due to quantum confinement effects [1], which in conjunction with reduced dielectric screening led to strongly bound excitons [2]. These layered materials found their way to research involving integration with nano-photonic structures such as plasmonic and dielectric cavities to realize both weak and strong coupling [3][4][5][6][7], low-threshold lasing [8], Purcell [9,10] and quantum efficiency enhancement [11] of single photon emitters (SPEs) in WSe 2 as well as coupling to collective resonances such as in periodic structures [12,13]. In these studies, the use of TMDs was limited to single and few-layer samples focusing on coupling emitted light from the material to resonances and cavity modes in different material systems [14].…”
mentioning
confidence: 99%
“…Covering the nanoantennas with WSe 2 leads to the activation of SPEs coupled to the optical mode, which is found to enhance the PL by a factor of 10 2 to 10 4 compared to strain activated SPEs by a low-refractive-index SiO 2 nanopillar. [140] Plasmonic nanostructures concentrate light to subwavelength dimensions and are therefore well suited to efficiently couple SPEs to propagating light fields. Already a rough metallic surface coated with a thin 3 nm dielectric Al 2 O 3 layer can serve as a platform to activate SPEs in WSe 2 due to strain and significantly reduce their PL decay times due to the presence of the plasmonic structure.…”
Section: Coupling To Resonant Cavitiesmentioning
confidence: 99%
“…Covering the nanoantennas with WSe2 leads to the activation of SPEs coupled to the optical mode, which is found to enhance the PL by a factor of 102 to 104 compared to strain activated SPEs by a low‐refractive‐index SiO2 nanopillar. [ 140 ]…”
Section: Perspectives and Applicationsmentioning
confidence: 99%