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Toward optical sensing with hyperbolic metamaterials

机译：利用双曲超材料实现光学传感

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摘要

A possible means of optical sensing, based on a porous hyperbolic material that is infiltrated by a fluid containing an analyte to be sensed, was theoretically investigated. The sensing mechanism relies on the observation that extraordinary plane waves propagate in the infiltrated hyperbolic material only in directions enclosed by a cone aligned with the optic axis of the infiltrated hyperbolic material. The angle this cone subtends to the plane perpendicular to the optic axis is θ_C. The sensitivity of θ_c to changes in the refractive index of the infiltrating fluid, namely n_b, was explored; also considered were the permittivity parameters and porosity of the hyperbolic material, as well as the shape and size of its pores. Sensitivity was gauged by the derivative dθ_c/dn_b. In parametric numerical studies, values of dθ_c/dn_b in excess of 500 deg per refractive index unit were computed, depending upon the constitutive parameters of the porous hyperbolic material and infiltrating fluid and the nature of the porosity. In particular, it was observed that exceeding large values of dθ_c/dn_b could be attained as the negative-valued eigenvalue of the infiltrated hyperbolic material approached zero.
机译：在理论上研究了一种基于多孔双曲线材料的光学传感方法，该材料被含有待检测分析物的流体渗透。感测机制依赖于这样的观察，即非同寻常的平面波仅在由与所渗透的双曲线材料的光轴对准的圆锥体所包围的方向中在所渗透的双曲线材料中传播。该圆锥体与垂直于光轴的平面所成的角度为θ_C。探索了θ_c对渗透流体折射率变化的敏感性，即n_b。还考虑了双曲线材料的介电常数参数和孔隙率，以及其孔的形状和大小。灵敏度通过导数dθ_c/ dn_b来衡量。在参数数值研究中，根据多孔双曲线材料和渗透流体的本构参数以及孔隙率的性质，计算出每个折射率单位的dθ_c/ dn_b值超过500度。特别地，观察到，当渗透的双曲线材料的负值特征值接近零时，可以达到超过dθ_c/ dn_b的大值。

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  • 来源
    《Optical engineering》 |2015年第6期|067102.1-067102.9|共9页
  • 作者

    Tom G. Mackay;

  • 作者单位

    University of Edinburgh, School of Mathematics and Maxwell Institute for Mathematical Sciences, Edinburgh EH9 3FD, United Kingdom,Pennsylvania State University, Department of Engineering Science and Mechanics, Nanoengineered Metamaterials Group, University Park, Pennsylvania 16802-6812, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Maxwell Garnett homogenization formalism; hyperbolic dispersion relation; spheroidal particles; uniaxial dielectric;

    机译：麦克斯韦·加内特均质化形式主义;双曲离差关系;球形颗粒;单轴电介质;

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