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Hybrid Plasmonics Waveguide Properties Of Dielectric Nanowires Coupling With Metal Substrate

Posted on:2016-09-09Degree:MasterType:Thesis
Country:ChinaCandidate:Y L ZhangFull Text:PDF
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In recent years, with the rapid growth of the society and the rapid development of information technology major needs optical communications, aimed at resolving the conventional optical communication devices large of volume, slow, low level of integration, and rapid decay and other practical problems, the researchers have proposed new effects and phenomenon of surface plasmon polaritions. In the theory and experiments realized of miniaturization, integration, functional, high-speed nano-photonic devices, it provided new evidence and methods of the optical information transmission and processing of the integrated optics in future. Surface plasmon polaritions are bound to the metal surface electromagnetic waves, and it can break the diffraction limit, and has great effect of local field enhancement, therefore SPP has great potential applications in nanophotonic devices and nonlinear optics also with an effective bridge of optical-electrical combination.This paper studies some properties of hybrid SPP waveguides, traditional SPP waveguide are mostly based medium and the metal surface excited by SPP. However, this type of SPP loss is relatively large, the attenuation relatively quickly, this is because of the inevitable ohmic heat loss of the metal itself, but a very important advantage of the metal SPP waveguide is that it has a good binding nature of the electromagnetic energy. On the contrary, electromagnetic wave propagation in dielectric waveguide loss is very small, but there is a big disadvantages of dielectric waveguide is that its poor localized electromagnetic energy, this makes the electromagnetic wave propagation process can easily spread to the other direction. In this letter, we demonstrate a hybrid plasmonics waveguide system consisting of a high-permittivity semiconductor nanowire (cylinder waveguide) embedded in a low-permittivity dielectric near a metal surface (SP waveguide). We used the typical dielectric materials with relatively low to high refractive indices, including magnesium fluoride (MgF2), silica (SiO2), indium tin oxide (ITO) and titanium dioxide (TiO2), as surrounding dielectric layer. With the strong coupling between dielectric cylindrical waveguide mode and the long-range surface plasmon polaritons (LRSPP) mode of a thin metal film, the basic waveguiding properties, including the effective mode area, the propagation length, the mode character, the coupling strength and the figure of merit (FoM) can be achieved. We also found surface plasmon polaritons can travel over large distances with strong mode confinement for different surrounding material. It is important and useful to design high-quality plasn(?)oics nanolaser and constructed practical nanoscale optical tweezers.1. Introduced the research background of our paper and the development process and significance of SPPs. Gave a brief description of Drude model.2. A brief introduction to the surface plasmon dispersion relations and Surface plasmon polaritons waveguides, finally discussed the surface plasmon (?)ritons waveguide loss problems.3. A brief introduction of several commonly methods used to excitation of surface plasmon polaritions and two commonly used numerical methods-FDTD, EM.4. We proposed a metal/dielectric waveguide hybrid based on surface plasmon polaritions and use the numerical analysis method to simulate the structure and theoretical analysis. We studied the changes in the intermediate nedium refractive index and the diameter of the semiconductor nanowires Si effects of the hybrid waveguide properties, including the effective mode area, the propagation length, the mode character, the coupling strength and the figure of merit (FoM).In summary, our results may provide useful information in the design of hybrid plasmonics waveguide. It is important and useful to design high-quality plasmonics nanolaser and constructed practical nanoscale optical tweezers.
Keywords/Search Tags:Surface Plasmon Polaritons, hybrid waveguide, couplingstrength, effective mode area FoM
PDF Full Text Request
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