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Design Of Ultrathin Surface Plasmon Resonance Sensors And Plasmonic Waveguide Couplers

Posted on:2012-09-12Degree:MasterType:Thesis
Country:ChinaCandidate:S DuFull Text:PDF
GTID:2178330335450819Subject:Circuits and Systems
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With the deepening of theoretical researches and the improving of production process in various structural devices, surface plasmon resonance (SPR) plays a vital role in many fields, such as integrated optics, chemistry, biology, and so on. Especially, the applications in sensors and integrated optics are of great concern due to immense commercial potential.Miniaturization, integration and high-performance will be the development trends of SPR sensor in the future. This thesis compared the structure and the sensitivity properties of the four types of SPR sensors, including prism coupler-based SPR sensor, fiber-optic SPR sensor, grating-coupled SPR sensor and waveguide-coupled SPR sensor. We also studied the ultrathin refractive index sensor based on media loaded bar-type plasma waveguide. The volume of this sensor was in an order ofμm magnitude, much smaller than prism coupler-based SPR sensor. It's much easier to achieve mass production than fiber-optic and grating-coupled SPR sensors. It also took the advantage of integration between waveguide-coupled SPR sensor and photonic circuits. The resolution could reach to 7×10-5 when the length of the waveguide was 150μm, so it's suitable for the measurements of samples which are extremely rare.In the applications of integrated optics, it was found that the coupling of Metal-Insulator-Metal(MIM) type SPR waveguide and ordinary dielectric slab waveguide could have the advantages of sub-wavelength size constraints which was owned by MIM-type plasma waveguide and weaken the high loss caused by MIM structure effectively. Thus, to improve the coupling efficiency further is the focus of concern nowadays.We investigated the properties of arc plasmonic waveguide coupler between two-dimensional dielectric slab waveguides and plasmonic waveguides by two-dimensional finite difference time domain methods (FDTD). The results showed that, connected by the coupler, the transmission efficiency between high index dielectric slab waveguides with width 300 nm and silver-air-silver waveguides with width 40 nm can reach to 90.4%, and could be improved to 98.4% by optimizing the structure near the ends of the coupler.
Keywords/Search Tags:Surface Plasmon Resonance, Sensors, Sensitivity, Waveguide Couplers
PDF Full Text Request
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