期刊
NANOTECHNOLOGY
卷 29, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa9b0b
关键词
spontaneous emission; one-dimensional photon collection; surface plasmon; evanescent waves
资金
- National Natural Science Foundation of China [11525414, 11374025, 91221304]
- National Key Basic Research Program [2013CB328700]
Combining the advantages of both gap surface plasmons (GSPs) and evanescent waves, we demonstrate simultaneously large Purcell enhancement and efficient one-dimensional collection of photons at subwavelength scale in the coupled nanowire-nanorod system. The spontaneous emission (SE) can be enhanced thousands of times based on the excitation of GSPs with strongly localized electromagnetic field. Emitted photons are directly collected by subwavelength confined evanescent modes and guided along the nanowire. By optimizing geometry and material parameters, 14 208 times of Purcell enhancement with collection efficiency up to 39.3% can be achieved in the Ag nanowire-Ag nanorod system where the emitted photons can spread more than 25 mu m, or SE is enhanced by 3142 times and up to 53% of emitted photons propagate with low loss in the dielectric nanowire-Ag nanorod system. This proposal that incorporates large Purcell enhancement, efficient nanoscale collection and one-dimensional propagation of photons, promises to have an important impact on bright single photon sources, plasmon-based nanolasers and on-chip nanodevices.
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