期刊
NANO LETTERS
卷 20, 期 3, 页码 1992-1999出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05268
关键词
hBN-defect-center; single-photon-source; nanoantenna; scanning-probe; super-resolution; luminescence-lifetime
类别
资金
- European Commission through ERC [670949-LightNet]
- H2020 Programme [820378]
- La Caixa Foundation
- Ministry of Science, Innovation Universities [RTI2018-099957-J-I00, PGC2018-096875-B-I00]
- Ministry of Economy [FIS2015-69258-P, BES-2016-078727]
- Severo Ochoa program for Centers of Excellence in RD [SEV-2015-0522]
- Catalan AGAUR [2017SGR1369]
- Fundacio Privada Cellex
- Fundacio Privada Mir-Puig
- Generalitat de Catalunya through the CERCA program
Defect centers in two-dimensional hexagonal boron nitride (hBN) are drawing attention as single-photon emitters with high photostability at room temperature. With their ultrahigh photon-stability, hBN single-photon emitters are promising for new applications in quantum technologies and for 2D-material based optoelectronics. Here, we control the emission rate of hBN-defects by coupling to resonant plasmonic nanocavities. By deterministic control of the antenna, we acquire high-resolution emission maps of the single hBN-defects. Using time-gating, we can discriminate the hBN-defect emission from the antenna luminescence. We observe sharp dips (40 nm fwhm) in emission, together with a reduction in luminescence lifetime. Comparing with finite-difference time-domain simulations, we conclude that both radiative and nonradiative rates are enhanced, effectively reducing the quantum efficiency. Also, the large refractive index of hBN largely screens off the local antenna field enhancement. Finally, based on the insight gained we propose a close-contact design for an order of magnitude brighter hBN single-photon emission.
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