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Long-period gratings (LPGs) and micro-photonic SOI ring-resonators were coated with materials derived from polydimethyl-siloxane to detect volatile organic compounds in air. Both sensors are capable of detecting the refractive index change of the polymer upon uptake of the analyte. The LPGs response was further amplified by fiber cavity ring-down.
Micro-photonic SOI Mach-Zehnder interferometers were coated with solid-phase micro-extraction materials derived from polydimethylsiloxane to enable sensing of volatile organic compounds of the BTEX class in air. A different coating based on functionalized mesoporous silicates is used to detect lead Pb(II) with a detection limit of < 100 ppb in water.
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