We investigated the excitation of whispering gallery modes (WGMs) in a silica microsphere by evanescent field coupling method using a ∼2 micrometer diameter fiber taper. Based on this configuration we have developed a sensitive refractometric sensor and observed a red-shift of the WGM resonances with the increase of the surrounding medium refractive index. A sensitivity of ∼114 nanometer per RIU has been achieved in the range of refractive indices from 1.3963 to 1.4004.
|Title of host publication||2015 Workshop on Recent Advances in Photonics, WRAP 2015|
|Number of pages||4|
|Publication status||Published - 4 Jan 2017|
|Event||2015 Workshop on Recent Advances in Photonics, WRAP 2015 - Bangalore, India|
Duration: 16 Dec 2015 → 17 Dec 2015
|Conference||2015 Workshop on Recent Advances in Photonics, WRAP 2015|
|Period||16/12/15 → 17/12/15|