title: Polymer microfiber rings for high-sensitivity optical humidity sensing.
abstract: We demonstrate microrings assembled with polyacrylamide (PAM) microfibers for high-sensitivity relative humidity (RH) sensing. When exposed to moisture, the PAM microfiber absorbs water molecules and inflates monotonically with the increasing humidity, resulting in evident spectral shifts of the resonance peaks of the microring. By measuring the spectral shifts, the microring shows sensitivity as high as 490 pm/%RH and a response time of about 120 ms, within a dynamic range from 5% to 71% RH.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Wang
authors.forename: Fuxing
authors.initials: F
authors.lastname: Gu
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D004784:Environmental Monitoring / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006813:Humidity; D013057:Spectrum Analysis / Q000295:instrumentation*; D013227:Steam / Q000032:analysis*; D014887:Weather; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D013227:Steam; D000099166:Polyacrylamides