Journal
NANO LETTERS
Volume 4, Issue 9, Pages 1669-1672Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0491677
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We use scattering-type apertureless near-field optical microscopy to demonstrate distance-controlled spectral resonance and phase shifts of a single near-field coupled system. In our experiment a metal tip optically interacts with a SiC surface at continuously varied nanometric distances. For illumination we use mid-infrared wavelengths (10 mum) where phonon polaritons in SiC resonantly enhance the near-field interaction. The phase of the scattered light increases and the resonance peak red shifts with decreasing gap width, in accordance with theoretical modeling.
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