Optical Fiber Based Mach-Zehnder Interferometer for APES Detection

Abstract

A 3-aminopropyl-triethoxysilane (APES) fiber-optic sensor based on a Mach–Zehnder interferometer (MZI) was demonstrated. The MZI was constructed with a core-offset fusion single mode fiber (SMF) structure with a length of 3.0 cm. As APES gradually attaches to the MZI, the external environment of the MZI changes, which in turn causes change in the MZI’s interference. That is the reason why we can obtain the relationships between the APES amount and resonance dip wavelength by measuring the transmission variations of the resonant dip wavelength of the MZI. The optimized amount of 1% APES for 3.0 cm MZI biosensors was 3 mL, whereas the optimized amount of 2% APES was 1.5 mL.

Micro-/Nano-Fiber Sensors and Optical Integration Devices

“…Deng et al designed a Mach-Zehnder interferometer using the dislocation fusion technology [ 1 ] and modified its surface with 3-aminopropyl-triethoxysilane (APES), which plays as a typical polymer to provide the electrostatic bonding chemical bonds during the layer-by-layer assembly technology for elaborating the optical fibers. The morphological parameters of the APES coating layer were determined and optimized by the microstructural Mach-Zehnder fiber interferometer This technology is crucial for the functional modification of selective enzymes, antibodies, or chemical bonds on the surface of optical fibers.…”