首页|Universal ultra-sensitive refractive index sensor based on an integrated SiO2 asymmetric Mach-Zehnder interference filter (AMZIF)
Universal ultra-sensitive refractive index sensor based on an integrated SiO2 asymmetric Mach-Zehnder interference filter (AMZIF)
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NSTL
Elsevier
This paper proposes an integrated universal ultra-sensitive refractive index sensor that is applicable for many kinds of liquid. The sensor is SiO2 asymmetric Mach-Zehnder interference filter (AMZIF) with a reference window and a sensing window on different arms. The formula derivation shows that the sensitivity of AMZIF is directly proportional to the arm length, and its measurement range can be expanded by reducing the diffraction order. The sensor is fabricated using standard planar lightwave circuit (PLC) technology, and the tested sensitivity reaches 21193.3 nm per refractive index unit (nm/RIU). With appropriate reference material, the universal AMZIF sensor can measure the refractive index of any liquid whose refractive index is between 1.33 similar to 1.45 and the sensitivity remains above 20000 nm/RIU.
Refractive index sensorIntegrated opticsMach-Zehnder interferenceUltra-sensitive
NSTL
Elsevier
