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Theory Research of Metal Slab and Metal Grating

Author: XuWei
Tutor: YeWeiMin
School: National University of Defense Science and Technology
Course: Optical Engineering
Keywords: surface plamsons metal slab metal grating thin-film soler cell
CLC: O436.1
Type: Master's thesis
Year: 2010
Downloads: 45
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Abstract


Based on surface plasmons, metal structures possess wide application prospects in the fields of sub-wavelength optics and photonic integrated circuits, because of its ability of confining and controlling light at the nanoscale. In this thesis, we theoretically investigated the eigenmodes of one dimensional metal slab and grating, and proposed a new way to improve the light absorption of thin-film soler cell based on the metal slab and grating structures.The main works of this thesis are as follows:1. Studied the eigenmode characteristics of insulator-metal-insulator (IMI) waveguide and insulator-metal-insulator-metal-insulator (IMIMI) waveguide. The dispersion relations and electric field distribution of these modes are presented. Long-range SPP mode of IMI waveguides only exists at the thickness of the metal below 60nm, and the mode size increases as the metal thickness decreases. Four surface plasmons modes exist in the IMIMI waveguide when the refractive index of the three insulators is uniform.Transmission peaks are observed at the transmission spectrum of IMIMI waveguide because of leaky mode resonance.2. Studied the eigenmode characteristics of multilayer metal slab and grating structure. The relationships between the structure parameters and the eignmodes with the electric field localized between the metal stripes are analyzed.3. Studied the application of metal slab and grating structure on thin-film soler cell. Six different structures are compared and the mechanism of improving the light absorption is analyzed. We proposed a new structure which combines silicon grating and metal grating to improve the light absorption of thin-film soler cell. The numerical simulation showed it can effectively enhance the short-circuit current.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Interference and diffraction
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