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Evanescently coupled resonance in surface plasmon enhanced transmission |
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| Authors: | A. Krishnan T. Thio T. J. Kim H. J. Lezec T. W. Ebbesen P. A. Wolff J. Pendry L. Martin-Moreno F. J. Garcia-Vidal |
| Affiliation: | a NEC Research Institute, 4 Independence Way, Princeton, NJ 08540, USA b ISIS, Université Louis Pasteur, Laboratorie des Nanostructures, 4 Rue Blaise Pascal, 67000 Strasbourg, France c Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA d The Blackett Laboratory, Imperial College, London SW7 2BZ, UK e Departamento de Física de la Materia Condensada, ICMA-CSIC, Universidad de Zaragoza, 50015 Zaragoza, Spain f Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain |
| Abstract: | The optical transmission through subwavelength holes in metal films can be enhanced by several orders of magnitude by enabling interaction of the incident light with independent surface plasmon (SP) modes on either side of the film. Here, we show that this transmission is boosted by an additional factor of 10 when the energies of the SP modes on both sides are matched. These results, confirmed by a three-dimensional theoretical analysis, give a totally new understanding of the phenomenon of SP enhanced transmission. It is found that the holes behave like subwavelength cavities for the evanescent waves coupling the SPs on either side of the film. In this unusual device, the reflection at either end of the cavity is provided by the SP modes which act as frequency dependent mirrors. |
| Keywords: | Surface plasmon Subwavelength resolution Evanescent wave Cavity |
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