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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