Isochromat photon map induced by scanning tunneling microscopy from gold particles

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Abstract
We have measured the maps of isochromat photon intensity induced by scanning tunneling microscopy (STM) from noble metal particles (Au) on a graphite surface. The map is obtained simultaneously with the STM topography image using an optical band-pass filter. The photon map changes depending on the wavelength of the light collected. The isochromat photon maps show that the spectra are varied with the tip position on the particles. This spectra variation is explained by the effect of the change in the tip curvature radius on the spectra of a local plasmon. © 1996 The American Physical Society.