Plasmonic waveguides, which support surface plasmon polaritons (SPP)
propagating along metal-dielectric interfaces, offer strong field confinement and
are ideal for the design of integrated nano-scale photonic devices. However, due
to free-carrier absorption in the metal, the enhanced mode confinement inevitably
entails an increase in the waveguide loss. This lowers the device figure-of-merit
achievable with passive plasmonic components and in turn hinders the
performance of active plasmonic components such as optical modulators.
Charles Lin, Yiwen Su, and Amr S. Helmy, "Nanoscale photonics using coupled hybrid plasmonic architectures," Proc. SPIE 9884, Nanophotonics VI, 98840C (Presented at SPIE Photonics Europe: April 04, 2016; Published: 18 April 2016); https://doi.org/10.1117/12.2227423.
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