基于五能级结构手征原子媒质，对光学时域隐身在外场调控下的实现进行了研究。在该五能级手征原子系统下，推导了原子媒质与光场参数相关的等效电磁响应参数的广义表达式，进而根据群折射率计算输出光脉冲。数值计算了五能级原子系统的外场以及原子媒质相关参数对隐身时域窗口大小以及形成时域窗口的光脉冲强度的影响。结果表明，时域窗口大小随控制场Rabi频率改变但基本不依赖于控制场的相位变化；两个耦合场相位在一个周期内的变化对左右旋圆极化输出波特性影响相反；两个耦合场中，当其中一个耦合场的Rabi频率减小时，对应时域窗口增大，但同时也会使形成窗口的脉冲强度减弱，而另一个耦合场Rabi频率则对时域窗口的大小影响较小。因此改变控制场和两个耦合场的强度、相位和失谐等参量可有效地调控输出脉冲的加速和延迟，产生显著的隐身时域窗口，提供了一种可操控的光学时域隐身的方案。

Chiral sum-frequency generation (SFG) has proven to be a versatile spectroscopic and imaging tool for probing chirality. However, due to polarization restriction, the conventional chiral SFG microscopes have mostly adopted noncollinear beam configurations, which only partially cover the aperture of microscope and strongly spoil the spatial resolution. In this study, we report the first experimental demonstration of collinear chiral SFG microscopy, which fundamentally supports diffraction-limited resolution. This advancement is attributed to the collinear focus of a radially polarized vectorial beam and a linearly polarized (LP) beam. The tightly focused vectorial beam has a very strong longitudinal component, which interacts with the LP beam and produces the chiral SFG. The collinear configuration can utilize the full aperture and thus push the spatial resolution close to the diffraction limit. This technique can potentially boost the understanding of chiral systems.

Electromagnetic topological chiral edge states mimicking the quantum Hall effect have attracted a great deal of attention due to their unique features of free backscattering and immunity against sharp bends and defects. However, the matching techniques between classical waveguides and the topological one-way waveguide deserve more attention for real-world applications. In this paper, a highly efficient conversion structure between a classical rectangular waveguide and a topological one-way waveguide is proposed and demonstrated at the microwave frequency, which efficiently converts classical guided waves to topological one-way edge states. A tapered transition is designed to match both the momentum and impedance of the classical guided waves and the topological one-way edge states. With the conversion structure, the waves generated by a point excitation source can be coupled to the topological one-way waveguide with very high coupling efficiency, which can ensure high transmission of the whole system (i.e., from the source and the receiver). Simulation and measurement results demonstrate the proposed method. This investigation is beneficial to the applications of topological one-way waveguides and opens up a new avenue for advanced topological and classical integrated functional devices and systems.

偏振是光的固有自由度，偏振探测提供了光强和波长之外的更多丰富信息。红外偏振探测器在成像、通信、遥感和宇宙学等众多应用中发挥着至关重要的作用。然而，传统的偏振检测系统体积庞大、系统复杂，阻碍了偏振探测的小型化和集成化。近来，片上红外偏振探测器的发展引起了广泛的研究兴趣。本文将重点介绍片上红外偏振探测器的两个前沿研究领域：偏振敏感材料和偏振选择性光耦合结构集成的红外偏振探测器，主要讨论片上红外偏振探测器的研究现状以及未来的挑战和机遇。

通过在入射光引入平移位相因子，从而实现了一种基于Richards‑Wolf矢量衍射理论的微尺度手性阵列光场的生成。通过模拟研究，进一步实现了阵列尺寸、阵列子单元手性的灵活调控。此外，探究了阵列的传播特性，在±λ传播距离内手性阵列光场均保持光场模式分布。该研究极大的丰富了手性强度光场的模式，在手性微纳材料的制备等领域具有良好的应用前景。

聚合物稳定VA（PSVA）液晶显示模式具有优异的光电性能。为进一步提升PSVA显示模式的透过率，在液晶中加入手性剂，形成手性掺杂聚合物稳定VA（C-PSVA）液晶显示模式。本文对C-PSVA显示模式的最优参数及实际显示效果进行研究。首先，建立模型对C-PSVA显示模式的光电特性及液晶分布进行模拟，分析了手性剂的加入对液晶排列产生的影响，对C-PSVA的显示原理进行分析。其次，研究了C-PSVA显示模式的延迟量、偏光片角度、手性剂比例对透过率提升的影响。最后，按照模拟结果配制液晶，制作C-PSVA样品，进行实际效果验证。结果表明，C-PSVA显示模拟的透过率较PSVA显示模式有明显提升，C-PSVA显示模式最佳延迟量约为460 nm，最优手性剂含量对应螺距值为4倍的盒厚。实测结果显示，与PSVA显示模式相比，C-PSVA显示模式透过率约有13%的提升。

Ultrafast laser pulses provide unique tools to manipulate magnetization dynamics at femtosecond timescales, where the interaction of the electric field usually dominates over the magnetic field. Recent proposals using structured laser beams have demonstrated the possibility to produce regions where intense oscillating magnetic fields are isolated from the electric field. In these conditions, we show that technologically feasible tesla-scale circularly polarized high-frequency magnetic fields induce purely precessional nonlinear magnetization dynamics. This fundamental result not only opens an avenue in the study of laser-induced ultrafast magnetization dynamics, but also sustains technological implications as a route to promote all-optical non-thermal magnetization dynamics both at shorter timescales – towards the sub-femtosecond regime – and at THz frequencies.