Bozorgzadeh Forough, Ahmadi Davood, Sahrai Mostafa
Appl Opt. 2020 Jan 1;59(1):84-91. doi: 10.1364/AO.59.000084.
We propose a new model for a fiber Bragg grating (FBG) filter based on one-dimensional defective photonic bandgap structures, which operates within telecom windows. The device is realized in an asymmetric $ {{\rm SiO}_2}/{{\rm TiO}_2} $SiO/TiO photonic crystal (PC) microcavity with the defect layer of the graphene disk placed in the center of the structure. The theoretical analysis of the optical properties of the narrowband FBG filter is given based on the combination of the density matrix approach with the transfer matrix method. The effect of the incident angle and the polarization of the probe field on the transmittance spectra is calculated. Also, tuning the filtering wavelength and the number of guided modes is performed by changing the properties of PC's defect layer. It is shown that depending on the ratio of the coupling fields' intensity, the probe field absorption can be minimized and even be amplified in $ {\lambda _0} = 1550;{\rm nm} $λ=1550nm. The results show very promising potential for fabrication of FBG filters operating in the near-infrared regime for light wave communications.
我们提出了一种基于一维缺陷光子带隙结构的光纤布拉格光栅（FBG）滤波器新模型，该模型在电信窗口内运行。该器件是在一种非对称的({\rm SiO}_2/{\rm TiO}_2)光子晶体（PC）微腔中实现的，石墨烯盘的缺陷层位于结构中心。基于密度矩阵方法与传输矩阵方法相结合，对窄带FBG滤波器的光学特性进行了理论分析。计算了探测场的入射角和偏振对透射光谱的影响。此外，通过改变光子晶体缺陷层的特性来调节滤波波长和导模数量。结果表明，根据耦合场强度的比值，在(\lambda_0 = 1550;{\rm nm})处，探测场吸收可以最小化，甚至可以被放大。结果显示了在近红外波段用于光波通信的FBG滤波器制造方面极具潜力。
