基于眼型谐振腔的Fano谐振曲线尖锐度的分析  

Analysis of Sharpness Fano Resonance Line Based on Eye-like Resonator

作　　者：娄小伟 崔锦江[1] 董宁宁[1] 徐建根[1] 檀慧明[1] 王帆[1] 

机构地区：[1]中科院苏州生物医学工程技术研究所江苏省医用光学重点实验室,江苏苏州215163 [2]中科院长春光学精密机械与物理研究所,长春130033 [3]中国科学院大学,北京100049

出　　处：《光子学报》2015年第1期58-63,共6页Acta Photonica Sinica

基　　金：国家自然科学基金青年基金(No.61007063);江苏省自然科学基金(No.BK2012188);江苏省产学研联合创新项目(No.BY2013034);苏州市医疗器械与新医药专项(No.ZXY2013005)资助

摘　　要：为了获得较大的尖锐度,提升微环传感器的灵敏度,提出利用眼型谐振腔结构在下路端输出的非对称Fano谐振光谱,眼型谐振腔由一个外环和内环构成,外环与总线波导耦合,内环与外环耦合.利用传输矩阵法对下路端输出光谱进行了数值计算,在不同剩余电场比例系数下,发现非对称Fano谐振峰的尖锐度随电场剩余比例系数的增大而增大;改变外环与总线波导间的场强耦合系数和内环与外环之间的场强耦合系数,其尖锐度的最大值随外环和内环场强耦合系数变化缓慢增大,尖锐度最大值处谐振点传输系数值在不同电场剩余比例系数和内外环场强耦合系数下稳定在-6dB附近.因此利用眼型谐振腔结构下路端的Fano谐振峰,可获得对耦合系数不敏感的尖锐度和谐振点传输系数,降低器件对耦合区加工准确度的要求.The asymmetric Fano-resonance spectra was proposed to obtain a larger sharpness and elevate the sensitivity of ring resonator,the Eye-like resonator is utilized to generate the asymmetric Fanoresonance spectra,the Eye-like resonator consists two rings resonators with the outer loop coupled to two bus waveguides and the inner loop couple to the outer loop.Numerical calculation of spectra on the drop port was utilized by the transfer matrix method,as the round trip loss varies,the value of sharpness increases with the round trip loss;by changing the outer loop coupling coefficients and inner loop coupling coefficients,the maximum value of sharpness of Fano-resonance change slowly;as the round trip loss varies and a lager range of the outer loop and inner loop coupling coefficients,the corresponding transmission at the resonant point remains almost unchanged,about-6dB.The sharpness of Fano resonant peak is insensitive for the coupling coefficients, which can reduce the requirements of manufacture of coupling region.

关 键 词：光波导 传感器 眼型谐振腔 Fano谐振 尖锐度 

分 类 号：O43[机械工程—光学工程]