We discuss the design and optimization of the absorber for the long-wavelength arm of the Terahertz intensity mapper, a balloon-borne spectrometer employing kinetic inductance detectors. Electromagnetic simulations of our design indicate in-band absorption efficiency over $\sim\! 80\%$ in both linear polarization modes. By developing custom transmission line model and mode-matching calculations, we find the absorption efficiency is affected by the absorber's reactive part and overall shape. These insights into the operation of this design provide guidance for its optimization for low-resistance absorber materials.

中文翻译：

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用于太赫兹强度映射器的准网格吸收器的优化

我们讨论了太赫兹强度映射器的长波长臂的吸收器的设计和优化，这是一种采用动力学电感检测器的气球载光谱仪。我们设计的电磁模拟表明带内吸收效率超过$\sim\! 80\%$在两种线性偏振模式中。通过开发定制传输线模型和模式匹配计算，我们发现吸收效率受吸收器的反应部分和整体形状的影响。这些对本设计操作的见解为其优化低电阻吸收材料提供了指导。