基于Fibonacci序列准周期结构的小角度低通空间滤波器

发布时间：2019-02-18 15:16

【摘要】：利用常规材料构造了Fibonacci序列准周期结构,运用传输矩阵法研究了该结构的空间传输特性,并基于该结构优良的空间传输特性设计了小角度低通空间滤波器.数值模拟结果表明,该小角度空间滤波器的角域带宽可通过改变序列的结构类型和序列数来调谐,其调谐规律为:随着Fibonacci序列F(m,1)中m值的增加,对应空间滤波器的角域带宽减小;随着序列数的增大,对应角域带宽也减小.在调谐的基础上,还可通过改变构成准周期结构的介质折射率参量来精确调节其角域带宽.相比于基于超材料的小角度空间滤波器而言,基于Fibonacci序列的小角度空间滤波器制备更简单,且有望应用于新一代的高功率激光系统中.
[Abstract]:The quasi-periodic structure of Fibonacci sequence is constructed by using conventional materials. The spatial transmission characteristics of the structure are studied by using the transfer matrix method. Based on the excellent spatial transmission characteristics of the structure, a low-pass spatial filter with small angle is designed. The numerical simulation results show that the angular bandwidth of the small angle spatial filter can be tuned by changing the structure type and the number of sequences, and the tuning law is as follows: with the increase of m value in Fibonacci sequence F (mt1), The angular bandwidth of the corresponding spatial filter is reduced; With the increase of the number of sequences, the bandwidth of the corresponding angular domain also decreases. On the basis of tuning, the angular bandwidth can be accurately adjusted by changing the refractive index parameter of the medium which constitutes the quasi-periodic structure. Compared with the small angle space filter based on supermaterial, the small angle space filter based on Fibonacci sequence is simpler to be prepared, and it is expected to be used in the new generation of high power laser systems.
【作者单位】：湖南理工学院信息与通信工程学院;
【基金】：国家自然科学基金(No.61205126) 湖南省教育厅科学研究优秀青年项目(2017) 湖南省科技计划项目(No.2016TP1021) 湖南省大学生实验项目(湘教通[2016]283号)资助~~
【分类号】：TN713

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