@article {doi:10.1002/lpor.201900025,
	title = {Brightening and Guiding Single-Photon Emission by Plasmonic Waveguide{\textendash}Slit Structures on a Metallic Substrate},
	journal = {Laser \&amp; Photonics Reviews},
	volume = {13},
	year = {2019},
	pages = {1900025},
	abstract = {Abstract By designing a plasmonic waveguide{\textendash}slit structure (a nanoslit etched in a silver nanowire) on a silver substrate, an ultrahigh Purcell factor and ultralarge figure of merit (FOM) are numerically predicted. Because of the large field enhancement (\&gt;150 times the incident field) and the ultrasmall optical volume (V\&nbsp;≈\&nbsp;2 {\texttimes} 10-5λ3) of the resonant mode in the metallic nanoslit, the simulations show that the Purcell factor in the system can reach up to FP\&nbsp;=\&nbsp;1.68\&nbsp;{\texttimes}\&nbsp;105, which is more than ten times the maximum Purcell factor in previous work (by placing metallic nanoparticles on a metal surface with a nanogap). Because of the utilization of a silver substrate rather than the common dielectric substrate, the mode cutoff of the surface plasmon polariton (SPP) waveguide mode is completely eliminated, which provides a large selection range of the nanowire radii to support the resonant mode in the nanoslit. Moreover, the SPP propagation length is significantly increased by more than 30 times. As a result, an ultralarge FOM of 1.40 {\texttimes} 107 is obtained, which is more than 80 times the maximum FOM in previous work where the metallic nanowire is placed on or surrounded by dielectric materials.},
	keywords = {bright single-photon emission, efficient guiding, long propagation length, metallic substrates, purcell enhancement},
	doi = {10.1002/lpor.201900025},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/lpor.201900025},
	author = {Guorui Zhang and Jia, Shangtong and Gu, Ying and Jianjun Chen*}
}
