Design Low Crosstalk Ring-Slot Array Structure for Label-Free Multiplexed Sensing

Sensors

Lijun Huang¹  Huiping Tian¹  Jian Zhou¹ 

[1] State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; E-Mails:

关键词: integrated optical devices;    optical sensing and sensors;    low crosstalk;    photonic crystals;   

DOI  :  10.3390/s140915658

来源: mdpi

【 摘 要 】

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 10⁴ 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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.