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Abnormal Cutoff Thickness of Long-Range Surface Plasmon Polariton Modes Guided by Thin Metal Films |
| LIU Fang;RAO Yi;HUANG Yi-Dong;ZHANG Wei;PENG Jiang-De |
| State Key Lab of Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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LIU Fang, RAO Yi, HUANG Yi-Dong et al 2007 Chin. Phys. Lett. 24 3462-3465 |
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Abstract Long-range surface plasmon polariton (LRSPP) modes guided by a thin metal film surrounded by semi-infinite dielectrics with different refractive indices are studied. Our calculation results show that the cutoff thickness of the metal film does not monotonically increase with refractive index difference △n between the substrate and superstrate. Just because of this abnormal behaviour of cutoff thickness, the existence of LRSPP illustrates complicated situations in asymmetric configurations. For a certain metal film thickness, LRSPP may exist in one, two or three refractive index difference △n regions.
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| Keywords:
52.35.Hr
42.79.Gn
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Received: 05 February 2007
Published: 03 December 2007
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| PACS: |
52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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42.79.Gn
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(Optical waveguides and couplers)
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