There is a growing interest to the multi-disciplinary field of droplet microfluidics having applications in physics, chemistry, biology, surface science, colloidal liquid dynamics etc. [1, 2]. Usually, optical sensing methods characterize the droplets with the spatial resolution determined by the wavelength of light, i.e., comparable with 1 micron. Alternatively, the approach suggested in Ref.  allows to determine the refractive index variation of submicron-thick liquid layers adjacent to the surface of microcapillaries. Microfluidic sensing in Ref.  was performed by measurement of the resonant whispering gallery mode (WGM) spectrum. Specifically, WGMs were launched into the microcapillary using the normally attached micron-diameter waist of a biconical fibre taper connected to the light source and optical spectrum analyser (OSA) as illustrated in Fig. 1(a). Evanescent coupling of WGMs to the interior of the microcapillary allowed to detect the refractive index variation of liquid by monitoring the shifts of the WGM resonances.
|Title of host publication||2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019|
|Publication status||Published - 17 Oct 2019|
|Event||2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 - Munich, Germany|
Duration: 23 Jun 2019 → 27 Jun 2019
|Conference||2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019|
|Period||23/06/19 → 27/06/19|