金属纳米孔阵列的偏振层析成像
Polarization tomography of metallic nanohole arrays
摘要：
我们报告了正方形和六边形对称的金属纳米孔阵列的偏振层析成像实验。作为主要结果，我们发现一个完全偏振的输入光束通过纳米孔阵列传输后，部分退偏。这种偏振相干性的损失被发现是各向异性的，即它取决于输入光束的偏振状态。退偏振归因于两个因素的组合：i）由于表面等离子体传播引起的阵列的非局部响应，ii）实际输入光束的非平面波性质。
英文摘要：
We report polarization tomography experiments on metallic nanohole arrays with square and hexagonal symmetry. As a main result, we find that a fully polarized input beam is partly depolarized after transmission through a nanohole array. This loss of polarization coherence is found to be anisotropic, i.e. it depends on the polarization state of the input beam. The depolarization is ascribed to a combination of two factors: i) the nonlocal response of the array due to surface plasmon propagation, ii) the non-plane wave nature of a practical input beam.
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