Ultrafast miniature fiber-tip Fabry-Perot humidity sensor with thin graphene oxide diaphragm

摘要

We demonstrate here an ultrafast, miniature, and high-performance fiber-tip Fabry-Perot (F-P) humidity sensor with similar to 300 nm-thick graphene oxide (GO) diaphragm suspended onto the end face of a capillary tube with an inner diameter of 50 mu m and a cavity length of similar to 100 mu m. The sensitivity to relative humidity (RH) spanning from similar to 10%RH to similar to 90%RH was examined based on the wavelength shift in the interference spectrum. Due to the intrinsic hydrophilicity of the porous GO membrane, the developed sensor exhibited an average wavelength variation of similar to 0.2 nm/%RH, which indicated a relatively broad and readily detectable RH linear measurement range. More prominently, an ultrahigh response time of 60 ms was achieved over other alternative F-P humidity sensors previously reported, to our knowledge. (C) 2018 Optical Society of America