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Nanoengineered hyperbolic materials for optical sensing applications

机译：用于光学传感应用的纳米工程双曲线材料

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Anisotropic dielectric materials characterized indefinite permittivity dyadics (known as hyperbolic materials) were investigated for possible optical sensing applications. Such materials present hyperbolic dispersion relations for extraordinary plane waves which only allow plane waves to propagate in certain directions. In contrast, anisotropic dielectric materials characterized positive-definite (or negative-definite) permittivity dyadics present elliptical dispersion relations which generally allow plane waves to propagate in all directions. The transition between hyperbolic and elliptical dispersion relations may be exploited for optical sensing. This phenomenon was investigated theoretically by considering the homogenization of a porous hyperbolic material which is infiltrated by an analyte-containing fluid. The theoretical approach adopted was based on the extended version of the Maxwell Garnett homogenization formalism Factors taken into consideration include the shape, size, and orientation of pores in the hyperbolic material as well as its porosity. It was found that exceeding large values of sensitivity could be attained as the negative-valued eigenvalue of the permittivity dyadic (or its real part for dissipative materials) of the infiltrated hyperbolic material approached zero.
机译：研究了具有不确定介电常数的二元各向异性各向异性电介质材料（称为双曲线材料），以用于可能的光学传感应用。对于非凡的平面波，此类材料呈现双曲线弥散关系，这仅允许平面波沿特定方向传播。相反，表征为正定（或负定）介电常数的各向异性的介电材料呈现椭圆色散关系，该椭圆色散关系通常允许平面波在所有方向上传播。双曲和椭圆色散关系之间的过渡可以用于光学传感。从理论上通过考虑由含分析物的流体渗透的多孔双曲线材料的均质性研究了该现象。所采用的理论方法是基于Maxwell Garnett均质化形式主义的扩展版本，所考虑的因素包括双曲线材料中孔的形状，大小和方向以及其孔隙率。已经发现，当渗透的双曲线材料的介电常数二进角（或对于耗散材料的实数部分）的负值特征值接近零时，可以实现超过大的灵敏度值。

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  • 来源
    《Nanostructured thin films VIII》|2015年|955815.1-955815.8|共8页
  • 会议地点 San Diego CA(US)
  • 作者

    Tom G. Mackay;

  • 作者单位

    School of Mathematics and Maxwell Institute for Mathematical Sciences, University of Edinburgh, Edinburgh EH9 3FD, UK,NanoMM-Nanoengineered Metamaterials Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA;

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