On-chip integrated differential optical microring refractive index sensing platform based on a laminar flow scheme

We propose an on-chip integrated differential optical microring refractive index sensing platform which leverages laminar flow conditions. Close spacing between a sensing and a reference resonator, and sharing the same microfluidic channel allows the two resonators to experience similar environmenta...

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Bibliographic Details
Published in:Optics letters 2015-09, Vol.40 (17), p.4106-4109
Main Authors: Kim, Dongwan, Popescu, Paula, Harfouche, Mark, Sendowski, Jacob, Dimotsantou, Maria-Eleni, Flagan, Richard C, Yariv, Amnon
Format: Article
Language:English
Subjects:
Channels
Detection
Disturbances
Lab-On-A-Chip Devices
Laminar flow
Optical Phenomena
Platforms
Refractive index
Refractivity
Refractometry - instrumentation
Resonators
Time Factors
Water
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Summary:We propose an on-chip integrated differential optical microring refractive index sensing platform which leverages laminar flow conditions. Close spacing between a sensing and a reference resonator, and sharing the same microfluidic channel allows the two resonators to experience similar environmental disturbances, such as temperature fluctuations and fluidic-induced transients, achieving reliable and sensitive sensing performance. We obtain a noise floor of 80.0 MHz (0.3 pm) and a bulk refractive index sensitivity of 17.0 THz per refractive index unit (RIU) (64.2 nm/RIU), achieving a limit of detection of 1.4×10(-5) RIU in a 30 min and an 8°C window.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.004106