| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Rainbow trapping based on long-range plasmonic Bragg gratings at telecom frequencies |
| Chen Lin (陈林)a, Zhang Tian (张天)a, Li Xunb |
a Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
b Department of Electrical and Computer Engineering, McMaster University, Ontario L8S4L8, Canada |
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Abstract The group velocity of long-range surface plasmon polaritons (LRSPPs) in a wide frequency bandwidth at infrared frequencies is significantly reduced by dielectric gratings of graded thickness on both sides of a thin metal film. This structure can reduce the propagation loss of slow surface plasmons in “rainbow trapping” systems based on plasmonic Bragg gratings. Compared with dielectric gratings of graded thickness on a single side of a metal film, the proposed structure is able to guide slow light with a much longer propagation distance for the same group index factor. Finite-difference time-domain simulation results show that slow LRSPPs with the group velocity of c/14.5 and the propagation distance of 10.4 μm are achieved in dielectric gratings of uniform thickness on both sides of a thin metal film at 1.62 μm.
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Received: 13 January 2013
Revised: 14 March 2013
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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42.25.Bs
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(Wave propagation, transmission and absorption)
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52.40.Db
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(Electromagnetic (nonlaser) radiation interactions with plasma)
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42.79.Gn
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(Optical waveguides and couplers)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11104093) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2011QN041). |
Corresponding Authors:
Chen Lin
E-mail: chen.lin@mail.hust.edu.cn
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Cite this article:
Chen Lin (陈林), Zhang Tian (张天), Li Xun Rainbow trapping based on long-range plasmonic Bragg gratings at telecom frequencies 2013 Chin. Phys. B 22 077301
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