Title :
Open-Cavity Fabry-Perot Interferometer Based on Etched Side-Hole Fiber for Microfluidic Sensing
Author :
Shengnan Wu ; Guofeng Yan ; Bin Zhou ; El-Hang Lee ; Sailing He
Author_Institution :
Dept. of Opt. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
An open-cavity fiber-optic Fabry-Perot interferometer (FPI) is designed and demonstrated, with a particular consideration for microfluidic refractive index (RI) sensing. The FPI is composed of an etched side-hole fiber (SHF) sandwiched between two single-mode-fibers. Chemical etching method is used to open up the cavity in the SHF. Experimental results show that an optimal RI sensitivity of more than 1250 nm/RI can be achieved with an open-cavity length of 38 μm for the microfluidic RI range from 1.3400 to 1.3470. In addition, the temperature sensitivity can reach an ultralow level of 1.1 pm/°C. The ease of fabrication, capability for in situ measurement, and excellent performance results suggest that the proposed FPI is highly promising as an inline refractometer for temperature-insensitive label-free microfluidic detection and sensing.
Keywords :
Fabry-Perot interferometers; etching; fibre optic sensors; micro-optomechanical devices; microfabrication; microfluidics; microsensors; optical design techniques; optical fibre fabrication; refractive index measurement; temperature sensors; chemical etching; etched side-hole fiber; in situ measurement; inline refractometer; microfluidic refractive index sensing; open-cavity fiber-optic Fabry-Perot interferometer; open-cavity length; single-mode-fibers; temperature sensitivity; temperature-insensitive label-free microfluidic detection; Cavity resonators; Microfluidics; Optical fiber sensors; Sensitivity; Temperature measurement; Temperature sensors; Fabry-Perot interferometer; Microfluidic sensing; Side-hole fiber; microfluidic sensing; side-hole fiber; temperature cross-sensitivity;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2443375
