可调谐光子晶体滤波特性研究
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摘要
为实现可调谐光滤波,用正折射率介质A和B设计了一维光子晶体(AB_1)~nB_2(AB_1)~n,B_1和B_2是厚度不同的同一种物质B。采用传输矩阵法和光子的束缚理论,分别对该结构的周期数、入射角、介质B2的厚度等参数进行传输特性的讨论。仿真结果表明:增加n值不改变透射峰的波长,但提高了峰的品质因子;透射峰的波长随入射角的增大而蓝移,其品质因子也随之增大;B2的厚度不仅可以线性调节透射峰的波长,还能实现单、双通道滤波切换。两种介质的折射率差值越大,透射峰的宽度越窄。以(AB_1)~nB_2(AB_1)~n为周期构成[(AB_1)~nB_2(AB_1)~n]~m,可在窄带范围内得到m-1条梳状透射峰。这些特性对可调谐滤波器的设计具有一定的指导意义。
In order to realize tunable optical filter, the one-dimensional photonic crystal with the structure of(AB_1)~nB_2(AB_1)~n is designed by using two positive index materials A and B. B1 and B2 are the same material B with different thickness. The transfer matrix method and tight-binding theory are chosen to study optical transmission properties of the structure by the periodic number, incident angle and the thickness of B2. It is found that if the period number is increased, the wavelength of transmission peak does not change, but the quality factor of the peak is improved. The wavelength of transmission peak appears blue-shift by increasing incident angle, and the quality factor is increased too. The thickness of the material B2 is properly adjusted, which not only can adjust the wavelength of the transmission peak, but also can realize the switching of single and double channel filters. The difference of refractive index of A and B is more, the transmission peak is narrower. If(AB1)nB2(AB1)n is chose as cell to form [(AB1)nB2(AB1)n]m, there are m-1 comb-like transmission peaks in the narrow band. The results have some reference value for design tunable filter.
In order to realize tunable optical filter, the one-dimensional photonic crystal with the structure of(AB_1)~nB_2(AB_1)~n is designed by using two positive index materials A and B. B1 and B2 are the same material B with different thickness. The transfer matrix method and tight-binding theory are chosen to study optical transmission properties of the structure by the periodic number, incident angle and the thickness of B2. It is found that if the period number is increased, the wavelength of transmission peak does not change, but the quality factor of the peak is improved. The wavelength of transmission peak appears blue-shift by increasing incident angle, and the quality factor is increased too. The thickness of the material B2 is properly adjusted, which not only can adjust the wavelength of the transmission peak, but also can realize the switching of single and double channel filters. The difference of refractive index of A and B is more, the transmission peak is narrower. If(AB1)nB2(AB1)n is chose as cell to form [(AB1)nB2(AB1)n]m, there are m-1 comb-like transmission peaks in the narrow band. The results have some reference value for design tunable filter.
引文
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[2]蒙成举,苏安.实现多共振模的一维异质结构光子晶体[J].光学技术,2013,39(1):92-96.
[3]Luo Z,Chen M,Deng J,et al.Low-pass spatial filters with small angle-domain bandwidth based on onedimensional metamaterial photonic crystals[J].OptikInternational Journal for Light and Electronics,2015,127(1):259-262.
[4]Shi M H,Kuang W,Yang T,et al.Experimental characterization of the optical loss of sapphire-bonded photonic crystal laser cavities[J].Fertility&Sterility,2015,103(2):513-518.
[5]Liu J,Mao Y,Ge J.Electric field tuning of magnetically assembled photonic crystals[J].Journal of Materials Chemistry C,2013,1(38):6129-6135.
[6]Luo J H,Zhang G,Gu Y,et al,G Quan.Sensing characteristics of in-line Mach-Zehnder interferometer based on magnetic fluid-filled multimode photonic crystal fiber[J].Microwave&Optical Technology Letters,2014,56(7):1720-1724.
[7]Alipour-Banaei H,Serajmohammadi S,Mehdizadeh F,et al.Special optical communication filter based on ThueMorse photonic crystal structure[J].Optica Applicata,2016,46(1):145-152.
[8]熊翠秀,邓杨保,邓曙光.基于对称嵌套式光子晶体量子阱的多通道滤波器[J].激光与光电子学进展,2016,(4):180-187.
[9]陈卫东,董昕宇,陈颖,等.对称双缺陷光子晶体的可调谐滤波特性分析[J].物理学报,2014,63(15):187-191.
[10]Xing X,Wang X,Li S,et al.Investigation of defect modes with Al2O3 and Ti O2 in one-dimensional photonic crystals[J].Optik-International Journal for Light and Electronics,2016,127(1):135-138.
[11]苏安,蒙成举,高英俊.实现高品质滤波功能的一维光子晶体量子阱滤波器[J].中国激光,2013,40(10):162-167.
[12]康永强,高鹏,刘红梅,等.单负材料组成一维光子晶体双量子阱结构的共振模[J].物理学报,2015,64(6):178-182.
[13]邹俊辉,张娟.混合准周期异质结构的带隙补偿与展宽[J].物理学报,2016,65(1):195-203.