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Multi-layered tungsten disulfide (WS 2 ) coated silicon/silica (Si/SiO 2 ) substrate and SiO 2  micro-bottle resonators (MBRs) have been prepared by van der Waals epitaxy method. Raman spectra of WS 2 -coated MBR show that the out-of-plane Raman mode is sensitive to the polarization of the excitation laser. The quality factor ( Q ) values of the whispering gallery modes (WGMs) in the transmission spectrum of an MBR decrease by 2 orders of magnitude on coating with WS 2 . On coating, a cleaner spectrum is obtained along with a concomitant effect of decrease in the number of lossy modes. Fano resonances as well as Autler-Townes splitting (ATS) was observed for the WGMs in the cleaned transmission spectrum. From the simulations it has been verified that the scattered electric field of the WS 2  flakes contributes to the observation of the Fano resonances and ATS in the coated MBR spectra.

Effect of coating few-layer WS2 on the Raman spectra and whispering gallery modes of a microbottle resonator

Effect of coating few-layer WS₂ on the Raman spectra and whispering gallery modes of a microbottle resonator