Imaging scanning tunneling microscope-induced electroluminescence in plasmonic corrals

Egusa, Shunji; Yish-Hann Liau; Scherer, Norbert F.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1257
Academic Journal
An approach to image localized and propagating surface plasmon (SP) modes is introduced. It is shown that scanning tunneling microscope (STM)-electroluminescence, the radiative decay of SPs induced by inelastically tunneling electrons, observed in Fourier space yields distinct features that reflect the degree of delocalization and spatial distribution of SP modes. The propagating SP is isolated from the localized mode by way of this Fourier space imaging approach. Furthermore, a cylindrically symmetric spatial interference pattern is obtained when the STM-induced plasmon is created within a circular “corral” boundary condition. © 2004 American Institute of Physics.


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