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Optical antennas are metallic nanostructures showing a resonant behaviour which can be tuned at wish. In this work, optical antennas from aluminum and gold are fabricated, optically characterized and investigated numerically by FDTD methods. Aluminum allows resonances in the UV while it forms an oxide layer in air which alters the antenna response. For the first time, the results from a local electrial excitation of nanoplasmonic structures via STM is presented.

Nanotechnologie --- plasmonics --- Optik --- Metalle --- metals --- Resonanznanotechnology --- optics --- resonance --- Plasmonik

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A short introduction to the theory of surface plasmon polaritons (SPPs) is given. The application of the SPPs in on-chip signal processing is discussed. In particular, two concepts of plasmonic modulators are reported, wherein the SPPs are modulated by 40 Gbit/s electrical signals. Phase and Mach-Zehnder modulators employing the Pockels effect in electro-optic organic materials are discussed. A few micro-meter long SPP absorption modulator based on a thin layer of indium-tin-oxide is reported.

phase modulator --- indium tin oxide --- Plasmonik --- surface plasmon polariton --- Indium-Zinn-Oxid --- Oberfla?chen-Plasmon-Polaritonen --- Plasmonics --- Modulatoren --- modulators --- Absorptionsmodulator --- Phasenmodulator --- absorption modulator