Experimental studies of extraordinary light transmission through periodic arrays of subwavelength square and rectangular holes in metal films |
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Authors: | Hua Yi-Lei Fu Jin-Xin Li Jiang-Yan Li Zhi-Yuan and Yang Hai-Fang |
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Institution: | Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China;Laboratory of Microfabrication, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China |
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Abstract: | We fabricate a series of periodic arrays of subwavelength
square and rectangular air holes on gold films, and measure the
transmission spectra of these metallic nanostructures. By changing
some geometrical and physical parameters, such as array period, air
hole size and shape, and the incident light polarization, we verify
that both global surface plasmon resonance and localized waveguide
mode resonance are influential on enhancing the transmission of
light through nanostructured metal films. These two resonances
induce different behaviours of transmission peak shift. The
transmission through the rectangular air-hole structures exhibits an
obvious polarization effect dependent on the morphology. Numerical
simulations are also made by a plane-wave transfer-matrix method and
in good consistency with the experimental results. |
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Keywords: | surface plasmon extraordinary light transmission metal
film |
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