Linear response and enhanced sensitivity of Mach-Zehnder interferometer with optimized sensing length.

ABSTRACT Through a sensing length of 1,1515 µm, the integrated Mach-Zehnder interferometer sensor obtains a quadrature point and linear response in refractive index range of 1.31-1.42. The sensitivity is measured as 225.4 dB/RIU, and the response time is less than 20 s to solutions. Cost-efficient polymers are used as waveguide materials, and a microfluidic system is achieved. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1697-1701, 2014 [ABSTRACT FROM AUTHOR]