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This thesis investigates the effect of the magnetic field on
propagating surface plasmon polaritons (SPPs), or surface plasmons
for short. Above all, it focuses on using the magnetic field as an
external agent to modify the properties of the SPPs, and therefore
achieving active devices. Surface plasmons are evanescent waves
that arise at metal-dielectric interfaces. They can be strongly
confined (beyond the light diffraction limit), and provide a strong
enhancement of the electromagnetic field at the interface. These
waves have led to the development of plasmonic circuitry, which is
a key candidate as an alternative to electronic circuitry and
traditional optical telecommunication devices, since it is faster
than the former and less bulky than the latter. Adopting both a
theoretical and an experimental point of view, the book analyzes
the magnetic modulation in SPPs by means of an interferometer
engraved in a multilayer combining Au and Co. In this
interferometer, which acts like a modulator, the SPP magnetic
modulation is studied in detail, as are the parameters that have a
relevant impact on it, simple ways to enhance it, its spectral
dependence, and the highly promising possibility of using this
system for biosensing. The thesis ultimately arrives at the
conclusion that this method can provide values of modulations
similar to other active methods used in plasmonics.
This thesis investigates the effect of the magnetic field on
propagating surface plasmon polaritons (SPPs), or surface plasmons
for short. Above all, it focuses on using the magnetic field as an
external agent to modify the properties of the SPPs, and therefore
achieving active devices. Surface plasmons are evanescent waves
that arise at metal-dielectric interfaces. They can be strongly
confined (beyond the light diffraction limit), and provide a strong
enhancement of the electromagnetic field at the interface. These
waves have led to the development of plasmonic circuitry, which is
a key candidate as an alternative to electronic circuitry and
traditional optical telecommunication devices, since it is faster
than the former and less bulky than the latter. Adopting both a
theoretical and an experimental point of view, the book analyzes
the magnetic modulation in SPPs by means of an interferometer
engraved in a multilayer combining Au and Co. In this
interferometer, which acts like a modulator, the SPP magnetic
modulation is studied in detail, as are the parameters that have a
relevant impact on it, simple ways to enhance it, its spectral
dependence, and the highly promising possibility of using this
system for biosensing. The thesis ultimately arrives at the
conclusion that this method can provide values of modulations
similar to other active methods used in plasmonics.
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