碳化钨合金因其具有高硬度、高耐磨性和高化学稳定性等优点，成为精密玻璃模压模具材料的首选。为了提高碳化钨合金模芯超精密磨削加工的表面质量，基于WC-6%Co碳化钨合金的物理特性，利用Abaqus建立磨削工艺仿真模型，分析了磨削深度、进给速度、砂轮转速及工件转速对WC-6%Co碳化钨合金磨削加工后表面粗糙度的影响规律，并讨论了磨削碳化钨合金的合理工艺参数范围。采用Taguchi法开展优化实验研究，确定出磨削碳化钨合金的最优工艺方案，在该方案指导下，完成了碳化钨合金的非球面模芯超精密磨削实验。最终得到的碳化钨合金模芯的表面粗糙度平均值为3.379 nm，验证了优化方案的有效性。

大口径离轴非球面反射镜进行高精度车削过程中，由离心力引起的微米级面形误差变得尤为重要。为了减小离轴非球面反射镜在车削过程中受离心力变形而引起的面形误差，对离轴非球面铝合金反射镜开展了单点金刚石车削工艺研究。通过分析离心力产生机理，构建了抑制离心力坐标变换加工模型；利用有限元仿真的方法优化了坐标变换的平移位移和旋转角度，最后基于优化结果对口径320 mm的RSA6061铝合金离轴非球面反射镜进行车削实验，获得了面形精度为RMS 0.198λ(λ=632.8 nm)的离轴非球面铝合金反射镜，验证了该优化加工方法的有效性。上述优化方式能够显著提高单点金刚石车削加工大口径离轴非球面反射镜的加工精度。

The widespread use of multifunctional metasurfaces has started to revolutionize conventional electromagnetic devices due to their unprecedented capabilities and exceedingly low losses. Specifically, geometric metasurfaces that utilize spatially varied single-celled elements to impart arbitrary phase modulation under circularly polarized (CP) waves have attracted more attention. However, the geometric phase has intrinsically opposite signs for two spins, resulting in locked and mirrored functionalities for the right-handed and left-handed CP beams. Additionally, the demonstrated geometric metasurfaces so far have been limited to operating in either transmission or reflection modes at a single wavelength. Here, we propose a double-layered metasurface composed of complementary elliptical and reversal ring resonator structures to achieve simultaneous and independent control of the reflection and transmission of CP waves at two independent terahertz frequencies, which integrates three functions of reflected beam deflection, reflected Bessel beam generation, and transmitted beam focusing on the whole space. The high efficiency and simple design of our metasurface will open new avenues for integrated terahertz metadevices with advanced functionalities.

采用3D打印方法开发光纤光栅应变传感器，建立裸光纤光栅传感器、3D打印封装层、被测基体三者之间的应变耦合传递的分离式模型，推导光纤光栅传感器与被测基体的应变传递关系，分析夹持式3D打印光纤光栅应变传感器应变传递率的影响因素，包括封装层弹性模量、封装层厚度、黏结长度。研究结果表明平均应变传递率与封装层弹性模量和黏结长度呈正相关，与封装层厚度呈负相关。研究成果对夹持式光纤光栅应变测量、误差修正和传感器设计，以及3D打印技术封装光纤布拉格光栅的可行性具有参考意义。