Download Active Plasmonic Devices: Based on Magnetoplasmonic by Diana Martín Becerra PDF

By Diana Martín Becerra

This thesis investigates the impact of the magnetic box on propagating floor plasmon polaritons (SPPs), or floor plasmons for brief. chiefly, it specializes in utilizing the magnetic box as an exterior agent to change the homes of the SPPs, and consequently reaching lively units. floor plasmons are evanescent waves that come up at metal–dielectric interfaces. they are often strongly restrained (beyond the sunshine diffraction limit), and supply a powerful enhancement of the electromagnetic box on the interface. those waves have resulted in the improvement 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 no more cumbersome than the latter.
Adopting either a theoretical and an experimental standpoint, the e-book analyzes the magnetic modulation in SPPs via 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, basic how one can improve it, its spectral dependence, and the hugely promising hazard of utilizing the program for biosensing. The thesis eventually arrives on the end that this technique grants values of modulations just like different energetic equipment utilized in plasmonics.

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Caballero, A. C. Cuevas, Phys. Rev. B 85, 245103 (2012) 78. I. A. Akimov, M. A. Kotov, S. S. V. R. K. Zvezdin, M. Bayer, Nat. Nanotechnol. 6, 370–376 (2011) 79. B. Khurgin, Appl. Phys. Lett. 89, 251115 (2006) References 25 80. W. Van Parys, B. Moeyersoon, D. Van Thourhout, R. Baets, M. Vanwolleghem, B. Dagens, J. Decobert, O. Le Gouezigou, D. Make, R. Vanheertum, L. Lagae, Appl. Phys. Lett. 88, 071115 (2006) 81. B. Sepulveda, L. Lechuga, G. Armelles, J. Lightwave Technol. 24, 945–955 (2006) 82.

Besides, the dielectric constants of the metal are complex (metals have absorption), and therefore the wavevector of the SPP will be complex too, k x = k xr + ik xi . Then, for z > 0 for example, Eq. 10 can be rewritten as: E z = Aeikx x e−kx x e−kz,d z . 11) The real part k xR is related to the phase velocity of the wave, and the imaginary part k xi is related to the losses of the wave, and thus to the propagation distance of the plasmon. As it can be seen in the Eq. 11), the SPP attenuation in the propagation direction x is related to the absorption of the metal.

This implies a conversion between the E x and the E y component of the field, and as a consequence a conversion of polarization. However, this is not an appropriate configuration to work with SPPs, as the plasmon do not have any E y component (it is a TM mode). Therefore, it will radiate light causing losses, which is not the desired effect. This “depolarization” of the plasmon happens also in the longitudinal configuration (ε yz = 0). The suitable MO configuration when dealing with SPPs in then the transverse one (εx z = 0).

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