We have proposed both symmetric and asymmetric configurations of 1D defective photonic crystal structures, which are designed with an alternate arrangement of MgF₂ and PbS for real-time detection of waterborne bacteria such as Escherichia coli, vibrio cholera and shigella flexneri. The transfer matrix method is employed to assay the transmittance and absorption spectrum of the said structures. A substantial shift in position of the resonant peak is noticed, when the defect layer is infiltrated with contaminated water containing different bacteria. The effects of variation in the defect layer thicknesses, angles of incidence and period of the dielectric layer on the sensor performance are thoroughly addressed. An optimum sensitivity of 387.5 nm/RIU, SNR of 79.2, FOM of 1174.24RIU⁻¹, DL of 2.44х10⁻⁴RIU and resolution of 0.0881 nm is achieved for asymmetric structure. The aforementioned upshots could open up an avenue for realization of effectual and real-time waterborne bacteria sensor for biophotonics applications.

我们提出了对称和不对称的一维缺陷光子晶体结构，这些结构设计成MgF ₂和PbS交替排列，用于实时检测水生细菌，如大肠杆菌，霍乱弧菌和弗氏志贺菌。转移矩阵法用于测定所述结构的透射率和吸收光谱。当缺陷层被含有不同细菌的污染水渗透时，共振峰的位置发生了实质性变化。彻底解决了缺陷层厚度，介电层入射角和周期的变化对传感器性能的影响。最佳灵敏度387.5 nm / RIU，SNR 79.2，FOM 1174.24RIU^-1，的2.44х10DL ^-4 RIU和的0.0881纳米的分辨率为不对称结构来实现的。前述结果可以为实现用于生物光子学应用的有效和实时的水性细菌传感器开辟一条途径。