| Original Articles |
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Complex Modulation in Plasmon-Assisted Transmission Spectra of a Two-Slit Structure |
| LI Zhi;ZHANG Jia-Sen;YAN Hai-Feng;GONG Qi-Huang |
| Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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LI Zhi, ZHANG Jia-Sen, YAN Hai-Feng et al 2007 Chin. Phys. Lett. 24 3233-3236 |
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Abstract We study the plasmon-assisted transmission of two kinds of slit structures in a 290-nm-thick silver film on a glass substrate. For the two-slit structure, the total transmission intensity spectra displays a complex modulation, which is attributed to different propagation constants of the surface plasmon polaritons (SPPs) on the silver-air and silver-glass interfaces. Replacing one of the two slits by a shallow corrugation results in a simple sinusoidal intensity modulation because of the only effective SPP excitation and propagation on the silver-air interface. These confirm the role of different SPP propagations and interference in the transmission properties of metal nanoslits.
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| Keywords:
73.20.Mf
42.79.-e
78.66.Bz
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Received: 24 June 2007
Published: 23 October 2007
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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42.79.-e
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(Optical elements, devices, and systems)
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78.66.Bz
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(Metals and metallic alloys)
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