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We report the effect of coating of tungsten disulphide (WS2) on fiberized silica microsphere resonator. Transmission measurements of the microsphere resonator have been done with the help of a tunable laser source and a tapered fiber. The quality (Q) factors have been measured for bare and WS2 coated microcavities. Results indicate that although there is a decrease of Q-factor from 107 to 105 after coating, it results in a cleaner spectrum. Cleaning of WGM spectra becomes important for applications such as sensing where observing a single mode resonance is essential in estimating the shift precisely. Asymmetric Fano-type profile has been observed in the clean spectrum due to the interaction of WS2 with the uncoated WGMs at 1550 nm.
Shubhayan Bhattacharya,Aneesh V. Veluthandath,C. C. Huang,Ganapathy Senthil Murugan, andPrem B. Bisht
"Scatterer induced Fano resonances in WS2 coated microsphere resonator", Proc. SPIE 11368, Photonics and Plasmonics at the Mesoscale, 1136804 (1 April 2020); https://doi.org/10.1117/12.2555631
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Shubhayan Bhattacharya, Aneesh V. Veluthandath, C. C. Huang, Ganapathy Senthil Murugan, Prem B. Bisht, "Scatterer induced Fano resonances in WS2 coated microsphere resonator," Proc. SPIE 11368, Photonics and Plasmonics at the Mesoscale, 1136804 (1 April 2020); https://doi.org/10.1117/12.2555631