title: Design low crosstalk ring-slot array structure for label-free multiplexed sensing.
abstract: We theoretically demonstrate a low crosstalk ring-slot array structure used for label-free multiplexed sensing. The proposed sensors array is based on an array of three ring-slot and input/output line defect coupling waveguides. Each ring-slot cavity has slightly different cavity spacing and different resonant frequency. Results obtained using two dimensional finite-difference time-domain (2D-FDTD) simulation indicate that the resonant frequencies of each sensor unit in response to the refractive index variations are independent. The refractive index sensitivity is 134 ~ 145.5 nm/RIU (refractive index unit) and the Q factors more than 10(4) can be achieved. The calculated detect limit lower than 1.13 × 10(-4) RIU is obtained. In addition, an extremely small crosstalk lower than -25.8 dB is achieved among the array of three ring-slot cavities. The results demonstrate that this multiplexed sensor array is a promising platform for integrated optical devices and enables highly parallel label-free detection.
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China. hljnet@163.com.
authors.forename: Lijun
authors.initials: L
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China. hptian@bupt.edu.cn.
authors.forename: Huiping
authors.initials: H
authors.lastname: Tian
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China. zhoujian19890109@sina.com.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China. jyf@bupt.edu.cn.
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Ji
mesh_terms: D016477:Artifacts; D001704:Biopolymers / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D012031:Refractometry / Q000295:instrumentation*; D059629:Signal-To-Noise Ratio; D013194:Staining and Labeling
chemical_list: D001704:Biopolymers