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Nearly perfect resonant absorption of TE-polarized light at metal surfaces coated with arrayed dielectric stripes

机译:TE偏振光在涂有阵列电介质条的金属表面上的共振吸收接近完美

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摘要

A quasi-transverse electric (TE) surface wave mode exists at a metal surface coated with an ultrathin high-index dielectric layer. As the coating is in dielectric stripe arrays, nearly perfect absorption of TE-polarized incidence light is observed in simulations, due to resonances of the quasi-surface waves at each segment of the dielectric-coated metal surfaces. In analysis, the Fabry-Perot-like nature of the resonances is clarified, and effects of symmetry on different behaviors of the odd- and even-order resonance modes are discussed. While the absorption peak is tunable, perfect absorption appears near cut-off wavelength of the surface mode.
机译:在涂有超薄高折射率介电层的金属表面上存在准横向电(TE)表面波模式。由于涂层处于电介质条带阵列中,由于在电介质涂覆的金属表面的每个部分处的准表面波都发生了共振,因此在模拟中观察到了TE偏振入射光的近乎完美的吸收。在分析中,阐明了共振的类似于Fabry-Perot的性质,并讨论了对称性对奇数和偶数共振模式的不同行为的影响。虽然吸收峰是可调的,但理想吸收在表面模式的截止波长附近出现。

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