Lahiri Basudev, McMeekin Scott G, Khokhar Ali Z, De La Rue Richard M, Johnson Nigel P
Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT, UK.
Opt Express. 2010 Feb 1;18(3):3210-8. doi: 10.1364/OE.18.003210.
In this paper, we report on a substantial shift in the response of arrays of similarly sized Split Ring Resonators (SRRs), having a rectangular U-shaped form--and made respectively of aluminium and of gold. We also demonstrate that it is possible to obtain the polarization dependent LC peak in the visible spectrum--by using SRRs based on aluminium, rather than gold. The response of metallic SRRs scales linearly with size. At optical frequencies, metals stop behaving like nearly perfect conductors and begin displaying characteristically different behaviour, in accord with the Drude model. The response at higher frequencies, such as those in the visible and near infra-red, depends both on their size and on the individual properties of the metals used. A higher frequency limit has been observed in the polarization dependent response (in particular the LC resonance peak) of gold based SRRs in the near infrared region. By using aluminium based SRRs instead of gold, the higher frequency limit of the LC resonance can be further shifted into the visible spectrum.
在本文中，我们报告了一系列尺寸相似的矩形U形开口环谐振器（SRR）阵列响应的显著变化，这些谐振器分别由铝和金制成。我们还证明，通过使用基于铝而非金的SRR，可以在可见光谱中获得偏振相关的LC峰。金属SRR的响应与尺寸呈线性比例关系。在光频下，金属不再表现得像近乎完美的导体，而是开始表现出与德鲁德模型一致的显著不同的行为。在较高频率下，如可见光和近红外光中的频率，其响应既取决于它们的尺寸，也取决于所用金属的个体特性。在近红外区域，基于金的SRR的偏振相关响应（特别是LC共振峰）已观察到更高的频率极限。通过使用基于铝的SRR而非金，LC共振的更高频率极限可以进一步移至可见光谱中。
