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The Research Of Sensors Based On Surface Plasmon Resonance

Posted on:2012-07-12Degree:MasterType:Thesis
Country:ChinaCandidate:W T MaFull Text:PDF
GTID:2178330338494404Subject:Optics
Abstract/Summary:PDF Full Text Request
Surface Plasmon resonance (SPR) is a special physical phenomenon of collective oscillation of the free electrons located on the metal surface by the light irradiation, which can generate strong local electric field so that the sensing technology based on surface Plasmon resonance have been widely used in high sensitive biochemistry sensing technology field. However, most SPR sensing instruments both at home and abroad have certain shortcomings such as complex structure, huge volume and high cost. To overcome the disadvantages, we can use the grating excitation method to design and develop the detection devices with high sensitivity, integration and high-throughput, which is of great significance for realizing the multi-channel and small chip detection, at the same time it is a very necessary research subject.The paper uses sub-wavelength grating to design sensing structures and main theoretically explores its structural parameters optimization design in order to achieve high sensitivity and high precision sensing properties. The paper is divided into four chapters.The chapter one firstly summarizes the overview of surface Plasmon resonance sensors which include research background and significance and then introduces the main contents of this paper.The chapter two introduces the electromagnetic theory of surface Plasmon resonance, presents analysis of two kinds of structures which support the surface Plasmon wave (SPW). Dispersion relationship and the excitation methods of surface Plasmon resonance are also studied.The chapter three describes the theory of SPR sensors, rigorous coupled wave analysis (RCWA) algorithm and Lorentz-Drude mode which describes the dielectric constant of metal in detail. The sub-wavelength metal grating structureⅠand sub-wavelength dielectric grating structureⅡfor sensing are proposed, their sensitivity and properties of resonance peaks are analyzed. Through the structural parameters optimization, for structureⅠ, the optimized thickness of Cytop buffer layer is 500 nm, full-width half-maximum (HWFM) of resonance peak is 5nm, wavelength sensitivity is 535nm/RIU; for structureⅡ, angle sensitivity and wavelength sensitivity are 127.870/RIU and 409.35nm/RIU, respectively, and the linearity is good in a large range of refractive index of superstrata. The chapter four summarizes the work and prospects.In short, the sub-wavelength grating structures for sensing studied in this paper will provide theoretical basis for the design and manufacturing of grating type sensors...
Keywords/Search Tags:surface Plasmon resonance, rigorous coupled wave analysis, sub-wavelength grating, extraordinary transmission
PDF Full Text Request
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