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Research On Optical Properties Of Waveguide Based On Surface Plasmon Polaritons

Posted on:2013-02-22Degree:MasterType:Thesis
Country:ChinaCandidate:Y N FanFull Text:PDF
GTID:2218330371957596Subject:Optical Engineering
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Surface Plasmon Polaritons(SPPs)are a special kind of electromagnetic field, which are confined to the interface of metal and dielectric materials. With the properties of transmission enhancement, sub-wavelength localization, making the possibility of in subwavelength scale metal structures achieve light field localization and guided waves, so as to bring new opportunities to raise the level of integration of photonic devices. Recently, based on SPPs metal/dielectric subwavelength waveguides become one of hot issue researches, which is seen as one of the leading technology to intergrating optical and electronic devices in the future.In this thesis, we present the basic theory of SPPs, such as dispersion relations, characteristic parameters, SPPs stimulating method, related physical mechanism and so on. This is the theoretical basis about research of SPPs. Furthermore, we describe details of metal dispersion model and FDTD numerical calculation method which is used to analyze of SPPs mode field distribution. This is of great significance to investigate the properties of the SPPs-based devices.The main research work includes the following aspects:1.We designed the metal triangle structure, using FDTD method to analyzed the situation of the excitation and the propagation of SPPs when light illuminate the structure.2.We studied the theory of the interference of SPPs on the metal / dielectric surface and deduced metal triangle structure SPPs interference cancellation conditions. We observed this interference cancellation phenomenon in FDTD simulation experiments.3.On the basis of deeply study near-field excitation of SPPs and SPPs interference theory, we designed the optical switch device structures based on metal triangle. With interference cancellation of SPPs excited by the signal and the modulated light, we realized the control of light on or off. The entire structure size is only 1.8 m m′1 m m, extinction ratio of the optical switch is 23dB, and the switching time is up to 0.9 fs.SPPs-based optical switch can control light in subwavelength, and can be applied to high-speed large-capacity optical fiber communication system. So it is an important research direction in the field of integrated optics.
Keywords/Search Tags:Surface Plasmon Polaritons, Drude Model, Finite Difference Time Domain, SPPs Interference Theory, Optical Switch
PDF Full Text Request
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