1. 毕业设计（论文）的内容和要求
主要内容：交错光栅是一种典型的二维光栅，在沿光传播方向上，两列光栅之间存在π相位差。
与一维光栅相比，交错光栅不仅能满足相位匹配条件，而且可以调整不同模式之间的耦合效率。
交错光栅已经被广泛应用于模式转换器、偏振旋转器、混合模式谐振腔等中。
2. 参考文献
[1] Xiao R, Shi Y, Li J, et al. On-chip mode converter based on two cascaded Bragg gratings[J]. Optics express, 2019, 27(3): 1941-1957.[2] Zhao Y, Shi Y, Xiong X, et al. Single Wavelength Resonator Based on $\pi $ Phase-Shifted Antisymmetric Bragg Grating[J]. IEEE Photonics Technology Letters, 2019, 31(16): 1339-1342.[3] Castro J M, Geraghty D F, Honkanen S, et al. Optical add-drop multiplexers based on the antisymmetric waveguide Bragg grating[J]. Applied optics, 2006, 45(6): 1236-1243.[4] Okayama H, Onawa Y, Shimura D, et al. Polarization rotation Bragg diffraction using Si wire waveguide grating and polarization rotator[J]. Optics express, 2015, 23(15): 19698-19704.[5] Yun H, Chen Z, Wang Y, et al. Polarization-rotating, Bragg-grating filters on silicon-on-insulator strip waveguides using asymmetric periodic corner corrugations[J]. Optics letters, 2015, 40(23): 5578-5581.[6] Wang X, Wang Y, Flueckiger J, et al. Precise control of the coupling coefficient through destructive interference in silicon waveguide Bragg gratings[J]. Optics letters, 2014, 39(19): 5519-5522.
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