Optical properties of subwavelength metallic-dielectric multilayers |
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Authors: | Guiqiang Du Hongqiang Li Hong Chen |
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Institution: | a Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, People's Republic of China b Institute of Precision Optical Engineering, Tongji University, Shanghai 200092, People's Republic of China |
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Abstract: | We present studies on the optical properties of periodic metallic-dielectric (MD) multilayers and numerical results show that there exists, insensitive to the lattice scaling, a transparent band as long as the layer thickness is in the subwavelength ranging. It illustrates the transparent band is controlled by mechanisms beyond the Bragg scattering: the shorter-wavelength band edge comes from the intensive resonant absorption behavior of the metals, while the longer-wavelength band edge is determined by zero (volume) averaged permittivity εeff=0. Moreover, a Lorentz-Drude model for the permittivity of a ε-negative (ENG) metamaterial is used to show that a transparent band may be obtained in a subwavelength structure consisting of ENG multilayers with total length less than both the center wavelength and the half width of the band. |
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Keywords: | 42 70 Qs 42 25 Bs 78 67 Pt |
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