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The polarization characteristics of photonic crystal fibers (PCFs) with nanoscale gold film are evaluated by using a finite element method. The coupling theory between core mode and SPP mode is introduced. Their application to fiber filter is investigated. The PCF filters for the ranges of 1.31, 1.48, and 1.55 $\mu\hbox{m}$ and a wide wavelength range are designed. We demonstrate that the resonance...
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