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Refractometric sensing of Li salt with visible-light Si3N4 microdisk resonators (2015)

C. Doolin, P. Doolin, B. C. Lewis and J. P. Davis

American Institute of Physics (AIP)

In: Applied Physics Letters

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Publication Date: 2015-02-25

Description: We demonstrate aqueous refractive index sensing with 15–30 μ m diameter silicon nitride microdisk resonators to detect small concentrations of Li salt. A dimpled-tapered fiber is used to couple 780 nm visible light to the microdisks, in order to perform spectroscopy on their optical resonances. The dimpled fiber probe allows testing of multiple devices on a chip in a single experiment. This sensing system is versatile and easy to use, while remaining competitive with other refractometric sensors. For example, from a 20 μ m diameter device we measure a sensitivity of 230 ± 20 nm/refractive index units (RIU) with a loaded quality factor of 1.5 × 10 4 , and a limit of detection down to (1.3 ± 0.1) × 10 −6 RIU.

Print ISSN: 0003-6951

Electronic ISSN: 1077-3118

Topics: Physics

Published by American Institute of Physics (AIP)

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