| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Fano Resonance by Symmetry Breaking Stub in a Metal-Dielectric-Metal Waveguide |
| TANG Dong-Hua1**, DING Wei-Qiang2 |
1Department of Physics, Northeast Forestry University, Harbin 150040
2Department of Physics, Harbin Institute of Technology, Harbin 150001
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| Cite this article: |
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TANG Dong-Hua, DING Wei-Qiang 2014 Chin. Phys. Lett. 31 057301 |
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Abstract The coupling of a stub obliquely intersected with a metal-dielectric-metal plasmonic waveguide is investigated by using the finite difference in time domain method. Results show that an odd mode, except for the usual even mode, is excited in the stub due to the symmetry breaking of the oblique intersection. Moreover, the results show that the quality factor of the odd mode is very high in comparison with that of the usual even mode, which is then explained by the symmetry breaking of the oblique stub intersection. The superposition of the even and the odd mode generates a Fano shaped spectrum with a very narrow linewidth. The effect of metallic loss and compensation are also discussed. Both the stub and the waveguide are compact in size, and simple in structure, which are beneficial for the achievements of narrow band filtering, sensing, lasing, and nonlinearity enhancement.
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Published: 24 April 2014
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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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42.82.Et
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(Waveguides, couplers, and arrays)
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42.79.Ci
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(Filters, zone plates, and polarizers)
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