  Surface plasmon polaritons (SPP or SP) are electromagnetic waves propagating
along metal dielectric interfaces and existing over a wide range of
frequencies. They have become popular because of their sub-wavelength
confinement and the possibility to perform ultrasensitive optical measurements.
Driven by tremendous progress in nanofabrication techniques and ultrafast laser
technologies the applications of SP nanooptics extend beyond the border of
nanoplasmonics. Here we review how using novel hybrid multilayer structures
combining different functionalities allows to develop active plasmonic devices
and new metrologies. Magneto-plasmonics, acousto-plasmonics and generation of
high-energy photoelectrons using ultrashort SP pulses represent a few examples
how the combination of ideas developed in the individual subfields can be used
to generate new knowledge suggesting plenty of exciting applications in
nanophotonics.
