基于对称破缺的导模共振耦合超窄带滤波器设计  

A design of broken-symmetry–based ultra-narrowband filter assisted by coupled guided-mode resonance

作　　者：马宇赞 和梦丽 赵亚丽 李旭峰[1,3] Ma Yuzan;He Mengi;Zhao Yai;Li Xufeng(College of Applied Science,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024,China;Department of Materials Science and Engineering,Jinzhong College,Jinzhong,Shanxi 030600,China;Industrial Research Institute of Pinglu District,Shuozhou,Shanxi 036800,China)

机构地区：[1]太原科技大学应用科学学院,山西太原030024 [2]晋中学院材料科学与工程系,山西晋中030600 [3]朔州市平鲁区产业研究院,山西朔州036800

出　　处：《光电工程》2024年第7期51-58,共8页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(62105131);太原科技大学研究生联合培养示范基地项目(JD2022007)。

摘　　要：为实现超窄带滤波器在光通讯、光传感领域的应用需求,本文提出了一种在非对称光栅波导结构中引入耦合导模共振,来完成对特定波长进行高效传输滤波。该滤波结构由集成在硅基波导上的两个具有同周期但不同填充因子的堆叠亚波长光栅构成。光从堆叠光栅中的顶部垂直入射,通过调节底部光栅的厚度和填充因子,可激发多波导模式的非对称共振耦合。仿真结果表明,利用该对称破缺导模共振耦合原理,在满足高边带抑制比的前提下,产生极强的电场增强,不仅能实现0.005nm的超窄带滤波效果,而且还具有很高的传输效率,可达到99%。In order to realize the application requirements of ultra-narrowband filters in the field of optical communication and optical sensing,this paper proposes a design concept of introducing a coupled guided mode resonance in an asymmetric grating waveguide structure to complete the efficient transmission filtering for specific wavelengths.The filtering structure consists of two added subwavelength gratings stacked on a silicon-based waveguide with the same period but different filling factors.Light waves are incident vertically from the top of the composite gratings,and the asymmetric resonant coupling of multiple waveguide modes can be excited by adjusting the thickness and filling factor of the bottom grating.Numerical simulations show that extremely strong electric field enhancement can be generated using this symmetry-broken guided-mode resonant coupling.Under the premise of satisfying the high sideband rejection ratio,the structure not only realizes the ultra-narrowband filtering effect of 0.005 nm,but also has a high transmission efficiency of 99%.

关 键 词：亚波长光栅 导模共振 超窄带滤波 耦合 

分 类 号：TN713[电子电信—电路与系统]