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- Title
Design Low Crosstalk Ring-Slot Array Structure for Label-Free Multiplexed Sensing.
- Authors
Lijun Huang; Huiping Tian; Jian Zhou; Yuefeng Ji
- 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 104 can be achieved. The calculated detect limit lower than 1.13 x 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.
- Subjects
OPTICAL devices; CROSSTALK; BIOSENSOR research; DETECTORS; PHOTONIC crystals
- Publication
Sensors (14248220), 2014, Vol 14, Issue 9, p15658
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s140915658