THz surface plasmon jump between two metal edges |
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Authors: | M. Nazarov A. Shkurinov |
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Affiliation: | a Department of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia b LAHC, University of Savoie, 73 376 Le Bourget du Lac Cedex, France |
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Abstract: | We excite surface plasmon in the THz frequency range at a metal surface using a diffraction grating coupler. Then the excited surface plasmon propagates along the flat metal surface, scatters into free space at the sample edge and then couples onto the flat surface of a second device similar to the emitting one. Using THz time-domain spectroscopy, we study plasmon propagation and its coupling processes in time and frequency domains. We measure a surface plasmon propagation length, at a flat air-aluminum interface, smaller than expected. We report for the first time a high coupling efficiency of the THz surface plasmon field between the two grating devices separated by a several centimeters-thick air gap. |
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Keywords: | 73.20.Mf 84.40.&minus x 42.79.Dj 42.25.Fx |
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