设计实现了基于同轴转臂的角分辨光谱测量系统, 适用于对表面等离激元结构进行角分辨镜面反射光谱表征。以激发转臂与收集转臂绕样品台表面回转实现定向入射与收集; 利用标准圆棒约束两转臂回转轴承同心, 并允许转臂与电动转盘径向相对移动以保证两转臂沿同轴转动, 进而确保角分辨光谱的角度信息准确; 利用反向传播神经网络算法对光栅分光光谱仪进行标定, 确保光谱信息准确。系统可分辨高度角范围为7.9°~89°, 最小角度分辨率为0.1°。通过该系统对金表面一维周期光栅、金表面二维周期纳米结构等样品在不同介质环境、不同高度角与不同方位角下进行镜面反射谱采集实验, 完成了对上述表面等离激元结构可靠的角分辨光谱表征。

We established an angle-resolved spectral measurement system based on coaxial rotation arms to construct the optical characterization on plasmonic structures. Two arms slew around the sample stage surface to achieve directional stimulation and collection; and a standard rod through two slewing bearings was used as the constraint and allowed radial relative movement between the pivot arm and electric turntable, which ensured the coaxial rotation to get accurate angle information. The spectrophotometer was calibrated by back-propagation neural network algorithm to ensure accurate wavelength information of angle-resolved spectrum. This system had altitude angle from 7.9°to 89°, and the angular resolution is 0.1°. Experiments on one-dimensional periodic gold grating and two-dimensional periodic structure on gold film demonstrated the capacity of the system in angle-resolved spectroscopic characterization for plasmonic samples in different environment, at different altitude angles and different azimuth angles.