Experimental Research on Ethanol Gas Sensing Characteristics of Microbottle Resonator Based on Whispering Gallery Mode

Abstract

This paper mainly studied the ethanol gas sensing characteristics of silica microbottle resonator coupled with non-adiabatic tapered fiber based on whispering gallery mode (WGM). The main research contents were the bulk refractive index sensitivity of silica microbottle resonator and the sensing characteristics of ethanol gas after being coated with graphene oxide (GO) and polydimethylsiloxane (PDMS), respectively. Experiments reveal that the bulk refractive index sensitivity of the silica microbottle resonator is 21.14941nm/RIU. The sensitivity of WGM silica microbottle resonator coated with GO to ethanol gas is about 1.55 pm/ppm. For the silica microbottle resonator sensor coated with PDMS, the sensitivity to ethanol gas is about 13.13 pm/ppm when the concentration is between 5.8ppm to 117ppm, and 1.44 pm/ppm when the concentration is between 117 ppm to 204.25 ppm.