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Sensors 2014, 14(9), 15658-15668; https://doi.org/10.3390/s140915658

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

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
2
Department of Physics and Information Engineering, Huaihua University, Huaihua 418008, China
*
Authors to whom correspondence should be addressed.
Received: 19 June 2014 / Revised: 14 August 2014 / Accepted: 20 August 2014 / Published: 25 August 2014
(This article belongs to the Section Physical Sensors)
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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 × 104 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. View Full-Text
Keywords: integrated optical devices; optical sensing and sensors; low crosstalk; photonic crystals integrated optical devices; optical sensing and sensors; low crosstalk; photonic crystals
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Huang, L.; Tian, H.; Zhou, J.; Ji, Y. Design Low Crosstalk Ring-Slot Array Structure for Label-Free Multiplexed Sensing. Sensors 2014, 14, 15658-15668.

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