The realization of pseudomagnetic fields for lightwaves has attained great attention in the field of nanophotonics. Like real magnetic fields, Landau quantization could be induced by pseudomagnetic fields in the strain-engineered graphene. We demonstrated that pseudomagnetic fields can also be introduced to photonic crystals by exerting a linear parabolic deformation onto the honeycomb lattices, giving rise to degenerate energy states and flat plateaus in the photonic band structures. We successfully inspire the photonic snake modes corresponding to the helical state in the synthetic magnetic heterostructure by adopting a microdisk for the unidirectional coupling. By integrating heat electrodes, we can further electrically manipulate the photonic density of states for the uniaxially strained photonic crystal. This offers an unprecedented opportunity to obtain on-chip robust optical transports under the electrical tunable pseudomagnetic fields, opening the possibility to design Si-based functional topological photonic devices.

设计了一款能实现全天候清晰成像的全景监控摄像光学系统。采用全景环带结构形式，该结构分为摄像头部单元和中继透镜单元两部分，摄像头部单元完成全视场目标搜索，中继透镜单元将头部单元所成的中间虚像进行二次成像会聚到探测器上。设计时采用多重结构优化方式，实现可见光及近红外双波段成像。该光学系统视场为360°×（40°~100°），焦距为?2.75 mm，F数为3.28。设计结果表明：系统的MTF（modulation transfer function）值在全视场处接近衍射极限，各个视场的弥散斑半径均小于所选CCD像元尺寸，畸变小于2 %，且日夜离焦量小于0.002 mm，该设计结果可满足全天候全景监控需求。

Laser ranging with frequency comb intermode beats (IMBs) has been suffering from random phase drifts (RPDs) for two decades. In this study, we reveal the influence of signal transmission path on the RPDs and propose a real-time suppression method using two IMBs of similar frequencies from different combs. As the two IMBs obtain similar RPDs during their transmission through same signal paths, the RPD of the original probing signal IMB is suppressed by deducting the RPD of the newly added local IMB in real time. In our experiments, a real-time suppression of RPDs is achieved using IMBs of 1001 and 1000 MHz. For the sampling time of 100 s, the effect of 19-fold suppression has been achieved. The proposed method provides a new solution for the long-standing phase drift problem in laser ranging with comb IMBs.

基于表面等离子体激元在金属-介质-金属结构中优良的传输特性，设计了一种由直波导和锚形谐振腔组成的波导滤波器。仿真分析了波导滤波器传输特性和电场分布随结构参数和谐振腔内介质折射率变化规律。结果表明，该锚形谐振腔最佳结构时滤波器半峰全宽低至8 nm，品质因数高达121.9。利用共振波长与结构参数变化规律，设计了光通信波长窗口的窄带带阻滤波器。根据SPPs对谐振腔介质折射率敏感的特性，发现透射谱线随折射率变大而发生红移。本文提出的基于锚形谐振腔的等离子体MIM波导滤波器为设计特定波长的窄带带阻滤波器提供了新思路，也为基于谱线红移特性设计的介质折射率传感器提供了技术支持。

为提高星模拟器光源系统光谱匹配精度，首先设计并搭建了基于数字微镜的星模拟器光源系统；其次，根据按波长标定的区域光谱进行遗传算法的光谱拟合，结果表明该方案拟合光谱与目标光谱存在一定匹配误差；最后，为提高光谱匹配的精度，提出了按波长和能量二维划分区域的误差反馈及精度提升方法。实验模拟了色温为2550、4766、6576、8910 K 光源，结果表明相较于波长方向一维划分的反馈方法，光谱匹配最大误差分别下降了55.7%、50.6%、45.2%、42.2%，极大地提升了星模拟器光源系统的光谱匹配精度。该研究旨在补偿该类色温匹配误差所引入的星敏感器角检测误差，达到高精度星敏感器的定标精度要求。