Wang Bo
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Sci Rep. 2015 Nov 12;5:16501. doi: 10.1038/srep16501.
The cancellation of the 0th order is described by a low-contrast fused-silica grating. In reported works, the high-contrast grating and complicated structure were applied with reasonable and excellent performance. However, the low-contrast grating is proved that it can also cancel the 0th order with the period more than 2λ in this paper. Grating parameters are optimized by using rigorous coupled-wave analysis, whose physical essence for cancellation of the 0th order can be well explained by modal method. The fabrication tolerance is investigated for production of the low-contrast grating for cancellation of the 0th order, which can be potentially used for writing the fiber Bragg grating.
零阶的消除由低对比度熔融石英光栅来描述。在已报道的工作中，高对比度光栅和复杂结构被应用并具有合理且优异的性能。然而，本文证明低对比度光栅在周期大于2λ时也能消除零阶。通过严格耦合波分析对光栅参数进行优化，其消除零阶的物理本质可以用模态方法很好地解释。研究了用于制造消除零阶的低对比度光栅的制造容差，该光栅有可能用于写入光纤布拉格光栅。
