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首页> 外文期刊>The Journal of Chemical Physics >Propagation lengths of surface plasmon polaritons on metal filmswith arrays of subwavelength holes by infrared imaging spectroscopy
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Propagation lengths of surface plasmon polaritons on metal filmswith arrays of subwavelength holes by infrared imaging spectroscopy

机译：亚波长孔阵列的金属薄膜表面等离激元极化子在红外成像光谱中的传播长度

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摘要

Metal films with arrays of subwavelength holes (mesh) exhibit extraordinary transmissionresonances to which many attribute a role for surface plasmon polaritons (SPPs); others debated thispoint. Experimental measurements of propagation lengths are presented under conditions thatpertain to the use of SPPs for surface spectroscopy. The lateral extent of electromagneticpropagation along the mesh surface is measured by recording absorption spectra of a line of latexmicrospheres as a function of distance away from the line along the mesh. Measurements reveal anexponential functional form for decay of absorption signal laterally from the absorption source.Results at 697 cm~(-1), which are closest to the strongest transmission resonance of the mesh, reveala 1 /e propagation distance along the surface of 17.8 ± 2.9 μm. This is 40% larger than the latticespacing implicating the holes as the SPP damping mechanism, however, this is significantly shorterthan smooth metal expectations.
机译：具有亚波长孔（网格）阵列的金属膜表现出非凡的透射共振，许多共振归因于表面等离振子极化子（SPP）。其他人对此进行了辩论。在允许使用SPP进行表面光谱分析的条件下，给出了传播长度的实验测量值。沿网孔表面的电磁传播的横向范围是通过记录乳胶微球线的吸收光谱作为沿网孔线的距离的函数来测量的。测量揭示了从吸收源侧向吸收信号衰减的指数函数形式。最接近网孔最强传输共振的697 cm〜（-1）处的结果表明，沿表面的传播距离为1 / e，为17.8± 2.9微米这比将孔作为SPP阻尼机制的晶格间距大40％，但是，这比光滑金属预期的要短得多。

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