Active Plasmonic Devices: Based on Magnetoplasmonic by Diana Martín Becerra

By Diana Martín Becerra

This thesis investigates the impression of the magnetic box on propagating floor plasmon polaritons (SPPs), or floor plasmons for brief. specifically, it specializes in utilizing the magnetic box as an exterior agent to change the homes of the SPPs, and consequently reaching energetic units. floor plasmons are evanescent waves that come up at metal–dielectric interfaces. they are often strongly constrained (beyond the sunshine diffraction limit), and supply a robust enhancement of the electromagnetic box on the interface. those waves have ended in the advance of plasmonic circuitry, that is a key candidate instead to digital circuitry and standard optical telecommunication units, because it is quicker than the previous and not more cumbersome than the latter.
Adopting either a theoretical and an experimental perspective, the e-book analyzes the magnetic modulation in SPPs through an interferometer engraved in a multilayer combining Au and Co. during this interferometer, which acts like a modulator, the SPP magnetic modulation is studied intimately, as are the parameters that experience a suitable impression on it, easy how one can increase it, its spectral dependence, and the hugely promising threat of utilizing the program for biosensing. The thesis eventually arrives on the end that this technique supplies values of modulations just like different energetic tools utilized in plasmonics.

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1). When a magnetic field is applied, the modulation will be larger if the ferromagnetic material is the one on which there is more electromagnetic field spread. In this example, the distribution of the electromagnetic field of the plasmon along the two materials (such as in Fig. 4) is going to change only in position depending on which material is the metal, but not in relative values. As there is more SPP electromagnetic field spread along the dielectric than along the metal, if the ferromagnetic material is the dielectric the SPP would feel more the magnetic influence and the modulation will be larger.

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The left part of Fig. 3 shows an sketch of these MP interferometers. When we apply the transverse magnetic field, we induce a change in the SPP wavevector k x (Eq. 14), and as a consequence we modify the SPP optical path in the interferometer (k x · d, as can be seen in Eq. 2). This results in a magnetic modulation of the plasmonic intensity I . Actually, this wavevector modulation will produce a shift in the plasmonic interferogram along the slit, y, as it is shown in Fig. 3. Therefore, at a fixed point within the slit, there will be a modulation on the plasmonic intensity I .

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