Agrawal Amit, Matsui Tatsunosuke, Vardeny Z Valy, Nahata Ajay
Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Opt Express. 2008 Apr 28;16(9):6267-73. doi: 10.1364/oe.16.006267.
Using terahertz time-domain spectroscopy, we have measured the optical properties of metallic films perforated with arrays of subwavelength apertures that possess short-range order (SRO), but lack long-range orientational order (LRO). We demonstrate that extraordinary transmission enhancement still occurs through the SRO aperture structures, despite the absence of LRO. The dielectric response of these arrays is characterized by a superposition of a broad principal resonance that is due to the random rotations of the building block (BB) units, and discrete resonances arising from well-defined reciprocal vectors in the structure factor that result from a virtual lattice associated with the BB units.
利用太赫兹时域光谱技术，我们测量了由具有短程有序（SRO）但缺乏长程取向有序（LRO）的亚波长孔径阵列穿孔的金属薄膜的光学性质。我们证明，尽管没有长程取向有序，但通过短程有序孔径结构仍然会出现异常的透射增强。这些阵列的介电响应的特征是，一个宽的主共振的叠加，这是由于构建块（BB）单元的随机旋转，以及由与BB单元相关的虚拟晶格导致的结构因子中明确的倒易矢量产生的离散共振。
