CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Extraordinary optical transmission through metal gratings with single and double grooved surfaces |
Wang Li-Chun(汪丽春)a)b), Deng Li(邓立) a)b), Cui Ni(崔妮)a)b) Niu Yue-Ping(钮月萍)a), and Gong Shang-Qing(龚尚庆)a)† |
a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract We investigate the transmission properties of a normally incident TM plane wave through metal films with periodic parabolic-shaped grooves on single and double surfaces using the finite-difference-time-domain method. Nearly zero transmission efficiency is found at wavelengths corresponding to surface plasmon excitation on a flat surface in the case where the single surface is grooved. Meanwhile, resonant excitation of surface plasmon polariton (SPP) Bloch modes leads to a strong transmission peak at slightly larger wavelengths. When the grating is grooved on double surfaces, the transmission enhancement can be dramatically improved due to the resonant tunnelling between SPP Bloch modes.
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Received: 19 February 2009
Revised: 20 March 2009
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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42.79.Dj
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(Gratings)
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68.55.-a
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(Thin film structure and morphology)
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78.66.Bz
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(Metals and metallic alloys)
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No. 60708008) and the
Project of Academic Leaders in Shanghai (Grant No. 07XD14030) and
the Knowledge Innovation Program of the Chinese Academy of
Sciences. |
Cite this article:
Wang Li-Chun(汪丽春), Deng Li(邓立), Cui Ni(崔妮) Niu Yue-Ping(钮月萍), and Gong Shang-Qing(龚尚庆) Extraordinary optical transmission through metal gratings with single and double grooved surfaces 2010 Chin. Phys. B 19 017303
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