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Observation of Giant Infrared Circular Dichroism in Plasmonic 2D-Metamaterial Arrays
ACS Photonics ( IF 7 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acsphotonics.7b01477
Richard Knipper 1, 2 , Thomas G. Mayerhöfer 1 , Vladimír Kopecký 3 , Uwe Huebner 1 , Jürgen Popp 1, 2
Affiliation  

We report the observation of an enormous circular dichroism (CD) response in broadband surface-enhanced infrared absorption sensing arrays. In our experiment, a 2D-metamaterial chiral cross-slit array adjusted for application in conventional measurement setups was used. The inherent chirality of the design results in a very strong CD absorbance of 0.83 at around 2.86 μm (3500 cm–1). This far surpasses our predictions based on the finite-difference time-domain simulations. This is probably the highest CD response ever reported for the mid-infrared region. Our observation was rigorously validated; thus most error sources were ruled out. Further, this Letter discusses our results in view of possible remaining artifacts that might have had an influence on our observations, as both chiral enantiomers and an achiral counterpart with similar structure were created and measured. A giant CD 2D-metamaterial might lead toward surface-enhanced vibrational circular dichroism spectroscopy, a field that is subject to lively discussions.

中文翻译:

等离子体二维超材料阵列中巨型红外圆二向色性的观察

我们报告在宽带表面增强红外吸收传感阵列中的巨大圆二色性(CD)响应的观察。在我们的实验中,使用了为常规测量设置中的应用而调整的二维超材料手性交叉缝阵列。设计的固有手征性导致在2.86μm(3500 cm –1)处有非常强的CD吸光度,为0.83)。这远远超过了我们基于有限差分时域仿真的预测。这可能是有报道的中红外区域最高的CD反应。我们的观察得到了严格的验证;因此排除了大多数错误源。此外,鉴于创建和测量了手性对映异构体和具有相似结构的非手性对应物,本信讨论了可能对我们的观察产生影响的可能残留人工产物,讨论了我们的研究结果。巨大的CD 2D元材料可能会导致表面增强的振动圆二色性光谱学,这一领域尚需进行热烈的讨论。
更新日期:2018-02-14
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