6533b827fe1ef96bd1286d70
RESEARCH PRODUCT
Cylindrical optical microcavities: Basic properties and sensor applications
Miguel V. AndrésBenito GimenoVanessa ZamoraAntonio Diezsubject
Detection limitMaterials scienceCapillary actionbusiness.industryMicrofluidicsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsOpticsRefractometerHardware and ArchitectureQ factorElectrical and Electronic EngineeringWhispering-gallery wavebusinessRefractive indexExcitationdescription
Abstract A detailed theoretical analysis of the basic properties of whispering-gallery modes (WGM) of thin capillaries is presented. The sensitivity of the resonances, as well as the Q factor is analyzed as a function of the structural parameters of the capillary and the refractive index inside the capillary. A practical application where thin capillaries are used for the measurement of glucose concentration in water is presented as a chemical sensor demonstrator. A best sensitivity of 1.24 nm/% of glucose concentration in water is reported, which corresponds to more than 850 nm/RIU. Additionally, different experimental approaches are discussed to improve the sensitivity and the detection limit that can be achieved using thin capillaries. Using thin and large diameter microcapillaries, and using a tapered fiber with the proper diameter for the excitation of the WGM, we estimate that refractive index changes smaller than 10 −6 can be detected, maintaining an optimum compatibility with microfluidic systems.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-04-01 | Photonics and Nanostructures - Fundamentals and Applications |