Tuning the effective plasma frequency of nanorod metamaterials from visible to telecom wavelengths
Tuning the effective plasma frequency of nanorod metamaterials from visible to telecom wavelengths
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DOI：
10.1063/1.4931687
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发表时间：
2015-09
影响因子：
4
通讯作者：
M. Nasir;S. Peruch;N. Vasilantonakis;William P. Wardley;W. Dickson;G. Wurtz;A. Zayats
中科院分区：
文献类型：
--
作者：
M. Nasir;S. Peruch;N. Vasilantonakis;William P. Wardley;W. Dickson;G. Wurtz;A. Zayats
双曲等离子体超材料对于设计传感、非线性和发射功能非常重要，这些功能在很大程度上取决于在超材料的有效等离子体频率附近观察到的epsilon接近零的行为。在这里，我们描述了一种在整个可见光和近红外光谱范围内调谐金纳米棒基超材料的有效等离子体频率的方法。这些超材料通过在亚硒酸中两步阳极氧化和化学后处理制成，由直径约为10纳米、间距约为100纳米的纳米棒组成，有效等离子体频率低至1200纳米以下的波长范围。这种超材料为生物和化学传感、非线性增强和红外荧光控制等领域的各种应用开辟了新的可能性。
Hyperbolic plasmonic metamaterials are important for designing sensing, nonlinear, and emission functionalities, which are, to a large extent, determined by the epsilon-near-zero behaviour observed close to an effective plasma frequency of the metamaterial. Here, we describe a method for tuning the effective plasma frequency of a gold nanorod-based metamaterial throughout the visible and near-infrared spectral ranges. These metamaterials, fabricated by two-step anodization in selenic acid and chemical post-processing, consist of nanorods with diameters of around 10 nm and interrod distances of around 100 nm and have a low effective plasma frequency down to a wavelength range below 1200 nm. Such metamaterials open up new possibilities for a variety of applications in the fields of bio- and chemical sensing, nonlinearity enhancement, and fluorescence control in the infrared.