Excitation of propagating surface plasmons with a scanning tunnelling microscope |
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Authors: | Wang T Boer-Duchemin E Zhang Y Comtet G Dujardin G |
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Affiliation: | Institut des Sciences Moléculaire d'Orsay (ISMO), CNRS Université Paris-Sud, 91405 Orsay, France. |
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Abstract: | Inelastic electron tunnelling excitation of propagating surface plasmon polaritons (SPPs) on a thin gold film is demonstrated. This is done by combining a scanning tunnelling microscope (STM) with an inverted optical microscope. Analysis of the leakage radiation in both the image and Fourier planes unambiguously shows that the majority (up to 99.5%) of the detected photons originate from propagating SPPs with propagation lengths of the order of 10 μm. The remaining photon emission is localized under the STM tip and is attributed to a tip-gold film coupled plasmon resonance as evidenced by the bimodal spectral distribution and enhanced emission intensity observed using a silver STM tip for excitation. |
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