Imperial College London
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ProfessorRiccardoSapienza

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 9577r.sapienza Website

 
 
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Location

 

B913Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sortino:2021:10.1038/s41467-021-26262-3,
author = {Sortino, L and Zotev, PG and Phillips, CL and Brash, AJ and Cambiasso, J and Marensi, E and Fox, AM and Maier, SA and Sapienza, R and Tartakovskii, AI},
doi = {10.1038/s41467-021-26262-3},
journal = {Nature Communications},
title = {Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas},
url = {http://dx.doi.org/10.1038/s41467-021-26262-3},
volume = {12},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 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.
AU  - Sortino,L
AU  - Zotev,PG
AU  - Phillips,CL
AU  - Brash,AJ
AU  - Cambiasso,J
AU  - Marensi,E
AU  - Fox,AM
AU  - Maier,SA
AU  - Sapienza,R
AU  - Tartakovskii,AI
DO  - 10.1038/s41467-021-26262-3
PY  - 2021///
SN  - 2041-1723
TI  - Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-021-26262-3
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000708601800015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.nature.com/articles/s41467-021-26262-3
UR  - http://hdl.handle.net/10044/1/93970
VL  - 12
ER  -
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