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Beam Focusing by a Non-Uniformly-Spaced Nanoslit Array in a Metallic Film |
| JIAO Xiao-Jin;WANG Pei;ZHANG Dou-Guo;LU Yong-Hua;XIE Jian-Ping;MING Hai |
| Department of Physics, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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JIAO Xiao-Jin, WANG Pei, ZHANG Dou-Guo et al 2006 Chin. Phys. Lett. 23 1884-1887 |
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Abstract A finite difference time domain simulation has been performed to analyse the optical transmission through a non-uniformly-spaced nanoslit array in silver film. The phase change of surface plasmons propagating on the silver film is used to modulate the initial phase of the output beam. The beam deflection and focusing function are designed, and the focal depth of the focusing metallic structure are mainly considered. It is found that the focal depth can be controlled by altering the effective width of this structure, i.e. the number of slits, when the relative spacing is fixed.
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| Keywords:
71.36.+c
73.20.Mf
78.66.Bz
42.25.Fx
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Published: 01 July 2006
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| PACS: |
71.36.+c
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(Polaritons (including photon-phonon and photon-magnon interactions))
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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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78.66.Bz
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(Metals and metallic alloys)
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42.25.Fx
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(Diffraction and scattering)
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