6533b852fe1ef96bd12ab699

RESEARCH PRODUCT

Whispering Gallery Mode Resonator Temperature Compensation and Refractive Index Sensing in Glucose Droplets.

Inga BriceAigars AtvarsJanis AlnisKarlis GrundsteinsKristians Draguns

subject

Optics and PhotonicsMaterials scienceTP1-1185engineering.materialBiochemistryTemperature measurementArticleAnalytical ChemistryCompensation (engineering)ResonatorCoatingsilica microsphereresonance scan methodThermalSilica microsphereElectrical and Electronic EngineeringInstrumentationrefractive index sensingPMMA coatingbusiness.industryChemical technologyTemperaturewhispering gallery mode resonator (WGMR)Atomic and Molecular Physics and OpticsMicrospherestemperature scanningRefractometryGlucoseengineeringOptoelectronicsWhispering-gallery wavebusinessRefractive index

description

Among the different types of photonic sensor devices, optical whispering gallery mode resonators (WGMRs) have attracted interest due to their high level of sensitivity, small size, and ability to perform real-time temperature measurements. Here we demonstrate the applicability of temperature measurements using WGMR in both air and liquid environments. We also show that WGMR allowed measurements of the refractive index variations in an evaporating glucose–water solution droplet. The thermal tuning of WGMR can be reduced by coating WGMRs with a thin layer of polymethyl methacrylate (PMMA). Dip-coating the silica microsphere multiple times significantly reduced the resonance shift, partially compensating for the positive thermo-optical coefficient of silica. The shift direction changed the sign eventually.

yearjournalcountryeditionlanguage
2021-10-01Sensors (Basel, Switzerland)
10.3390/s21217184https://pubmed.ncbi.nlm.nih.gov/34770491