2D quasiperiodic plasmonic crystals.

2D quasiperiodic plasmonic crystals.
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DOI:
10.1038/srep00681
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Giessen, Harald
Giessen, Harald
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bauer, Christina;Kobiela, Georg;Giessen, Harald

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具有不规则对称性的纳米光子结构,例如准周期等离子体激元晶体,已经获得了越来越多的关注,特别是作为以角度不敏感的方式增强太阳能电池的吸收的潜在候选者。为了研究决定其光学性质的这种系统的光子能带结构,有必要测量和建模与等离子体激元晶体的垂直和倾斜光相互作用。我们确定了不同的传播矢量,并考虑了所有可能的波导模式和粒子等离子体在二维金属光子准晶的相互作用,结合平板波导的色散关系。利用Fano模型,我们计算了垂直和倾斜入射光的光学性质。比较测量的准周期晶格的入射角的变化在两个方位角和极方向的样品的建模光谱给出了极好的协议,并确认了我们的模型的预测能力。
Nanophotonic structures with irregular symmetry, such as quasiperiodic plasmonic crystals, have gained an increasing amount of attention, in particular as potential candidates to enhance the absorption of solar cells in an angular insensitive fashion. To examine the photonic bandstructure of such systems that determines their optical properties, it is necessary to measure and model normal and oblique light interaction with plasmonic crystals. We determine the different propagation vectors and consider the interaction of all possible waveguide modes and particle plasmons in a 2D metallic photonic quasicrystal, in conjunction with the dispersion relations of a slab waveguide. Using a Fano model, we calculate the optical properties for normal and inclined light incidence. Comparing measurements of a quasiperiodic lattice to the modelled spectra for angle of incidence variation in both azimuthal and polar direction of the sample gives excellent agreement and confirms the predictive power of our model.
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