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arXiv 1106.3591physics.optics
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红外超导纳米线单光子探测器极方位角优化的数值方法

Numerical method to optimize the Polar-Azimuthal Orientation of Infrared Superconducting Nanowire Single-Photon Detectors

Mária Csete, Áron Sipos, Faraz Najafi, Xiaolong Hu, Karl K. Berggren

摘要:

基于COMSOL软件包中的RF模块,提出了一种计算三维纳米结构光吸收的有限元方法。该方法能够数值地确定亚波长周期性结构的光学响应和近场分布作为由极角fi和方位角γ指定的照明取向的函数。将该方法应用于基于腔的超导纳米线单光子探测器(SNSPD)设计中,以确定与照明角度相关的吸收率。基于传统SNSPD的尺寸和集成的四分之一波长的氢倍半硅氧烷填充的纳米光学腔,并覆盖一层薄的金膜作为反射器的氮化铌条纹从下面的p-偏振光在这项研究中照明。数值计算结果进行了比较,从互补的传输矩阵法计算的复合材料层类似的膜堆。这种比较有助于揭示光学响应中出现极值的光学现象。本文提出了一种通过同时数值优化极角和方位角照明角度来优化不同传感和检测设备的吸收率的方法。

英文摘要:

A novel finite-element method for calculating the illumination-dependence of absorption in three-dimensional nanostructures is presented based on the RF module of the COMSOL software package. This method is capable of numerically determining the optical response and near-field distribution of sub-wavelength periodic structures as a function of illumination orientations specified by polar angle, fi, and azimuthal angle, gamma. The method was applied to determine the illumination-angle-dependent absorptance in cavity-based superconducting-nanowire single-photon detector (SNSPD) designs. Niobium-nitride stripes based on dimensions of conventional SNSPDs and integrated with ~ quarter-wavelength hydrogensilsesquioxane-filled nano-optical cavities and covered by a thin gold film acting as a reflector were illuminated from below by p-polarized light in this study. The numerical results were compared to results from complementary transfer-matrix-method calculations on composite layers made of analogous film-stacks. This comparison helped to uncover the optical phenomena contributing to the appearance of extrema in the optical response. This paper presents an approach to optimizing the absorptance of different sensing and detecting devices via simultaneous numerical optimization of the polar and azimuthal illumination angles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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