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Keilmann, F.
Journal of microscopy (Oxford), 19/May , Letnik: 194, Številka: 2‐3Journal Article
Surface plasmon‐, phonon‐ and exciton‐polaritons exist on specific materials in specific spectral regions. We assess the properties of such travelling surface‐bound electromagnetic waves relevant for scanning near‐field optical microscopy applications, i.e. the tightness of surface binding, the attenuation, the phase velocity and the coupling with free‐space electromagnetic waves. These quantities can be directly determined by photographic imaging of surface plasmon‐ and surface phonon‐polaritons, in both the visible and mid‐infared regions. Focusing of mid‐infrared surface plasmons is demonstrated. Surface waveguides to transport and focus photons to the tip of a scanning near‐field probe are outlined.
