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Focusing lens surface plasmon - based metal imaging mechanism design optimization

Author: ZouDaQing
Tutor: LiXiangYin
School: Nanjing University of Technology and Engineering
Course: Plasma Physics
Keywords: Surface plasmon Subwavelength devices Phase adjustment Focal length FDTD method
CLC: O435.1
Type: Master's thesis
Year: 2010
Downloads: 192
Quote: 0
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Abstract


Surface plasmon as lightwave metal free-electron interaction of the electromagnetic mode , to break the diffraction limit to achieve subwavelength photoelectric circuit integration . With the processing of a wide range of precision , based on surface plasmon subwavelength photonic integrated devices on theoretical and experimental research . In this paper, on the basis of summarize the basic theoretical and experimental surface plasmon subwavelength metal focusing lens imaging analysis and optimization of the design . The first part of the proposed the metal focusing lens model ( metal double-slit medium grating modified structure ) , and analysis of the physical parameters of the double-slit and the exit surface dielectric grating optical transmission . Research first focus lens for metal , particularly the metal focusing lens is a single slit the existing problems of the metal double-slit the advantages of the focusing lens ; Secondly, waveguide dispersion diffraction grating , and rigorous coupled wave theory, the affected surface plasmon effective refractive index, optical phase relationship and excitation of the physical parameters of the surface plasmon resonance angle . The second part of the optimization to design a variety of methods to adjust the focal length and focusing deflection , and pointed out that the relative strengths of the various methods . The adjustment of the focal length of the three kinds of methods: a change of the width of the middle of the dielectric column , compared to the the metal single slit structure chirped grating surface medium cycle, reducing the number of processing medium ; change the surface shape of the dielectric gratings can be achieve and coke grew up adjustment range ; 3 . changing the the medium linear grating thickness distribution , maximum adjustment range of up to 1.16μm , much larger than 0.77 μm and surface structure of the metal groove , precision machining and metal coating relative to the Trench easy . Focus deflection adjustment mainly two methods : 1 . Asymmetric change the physical parameters of the ( filling medium refractive index and the slit width ) of the double-slit , especially asymmetric change the refractive index of the maximum deflection angle up to 25 °, relative to the asymmetric adjusting the single slit the grating period of the structure of both sides of the media , easy to adjust and processing ; 2. to change rectangular beam incident angle , in a certain angle can also be achieved focusing structure focus deflection .

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CLC: > Mathematical sciences and chemical > Physics > Optics > Geometrical optics > Reflection and refraction
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