| A resonator mode in linear arrays of silver spheres and cylinders |
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| 作者姓名： | SIMOVSKI C.R VIITANEN A.J. TRETYAKOV S.A |
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| 作者单位： | Department of Photonics and Optical Informatics State University of Information Technologies 197101 Sablinskaya 14 St. Petersburg Russia，Electromagnetic Laboratory Helsinki University of Technology FI-02015 Espoo Finland，Radio Laboratory SMARAD Helsinki University of Technology FI-02015 Espoo Finland |
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| 摘 要： | INTRODUCTION The waveguide properties of linear arrays (chains) of silver nano-particles at optical frequencies are well known (Krenn et al., 1997; 1999; Tretyakov and Viitanen, 2000; Girard et al., 1994; Weber and Ford, 2004). Silver spheres and ellipsoids can support forward or backward waves along the chain depend- ing on their polarization state and the eigenfrequency (Krenn et al., 1999; Tretyakov and Viitanen, 2000; Girard et al., 1994; Weber and Ford, 2004). At com- paratively …
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| 关 键 词： | 谐振器 谐振腔模 线阵 等离振子质点 银球 银柱 |
| 收稿时间： | 2005-09-05 |
| 修稿时间： | 2005-10-10 |
A resonator mode in linear arrays of silver spheres and cylinders |
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| SIMOVSKI C.R VIITANEN A.J. TRETYAKOV S.A.A resonator mode in linear arrays of silver spheres and cylinders[J].Journal of Zhejiang University Science,2006,7(1):29-33. |
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| Authors: | C R Simovski A J Viitanen S A Tretyakov |
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| Institution: | (1) Department of Photonics and Optical Informatics, State University of Information Technologies, 197101, Sablinskaya, 14, St. Petersburg, Russia;(2) Electromagnetic Laboratory, Helsinki University of Technology, FI-02015 Espoo, Finland;(3) Radio Laboratory SMARAD, Helsinki University of Technology, FI-02015 Espoo, Finland |
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| Abstract: | A transversal mode with zero group velocity and non-zero phase velocity that can exist in chains of silver nano- spheres in the optical frequency range was theoretically studied. It is shown that the external source radiating a narrow-band non-monochromatic signal can excite in the chain a mixture of standing and slowly travelling waves. The standing wave com- ponent (named as resonator mode) is strongly dominating. The physical reason of such a regime is a sign-varying distribution of power flux over the cross section of the chain. This situation is similar to the scenario of the propagation of a wave along the boundary between the right-handed and left-handed media where the spatial distribution of the light intensity is vortex. However, in the present case there is no boundary between media and the boundary between the positive and negative power fluxes is a cylindric tube in free space whose axis is the axis of the chain. |
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| Keywords: | Resonator mode Linear arrays Plasmon particle |
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