Abstract
Multi-layered tungsten disulfide (WS2) coated silicon/silica (Si/SiO2) substrate and SiO2 micro-bottle resonators (MBRs) have been prepared by van der Waals epitaxy method. Raman spectra of WS2-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 WS2. 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 WS2 flakes contributes to the observation of the Fano resonances and ATS in the coated MBR spectra.
Highlights
Two dimensional (2D) materials and their heterostructures have attracted considerable attention since the discovery of graphene [1]
The simulations indicate that the interaction of the whispering gallery modes (WGMs) of micro-bottle resonators (MBRs) with the Mie scattering of WS2 flakes gives rise to the Fano [22,23,24]—type and electromagnetic induced transparency [25, 26] (EIT)-type resonances as well as the Autler Townes splitting (ATS) in the observed spectra
A few layered films of the transition metal dichalcogenides (TMDCs) material WS2 have been fabricated on a fused silica substrate and MBR by van der Waals epitaxy (VdWE) method
Summary
Two dimensional (2D) materials and their heterostructures have attracted considerable attention since the discovery of graphene [1]. The light is localized due to the total internal reflection in WGMs [15] These microcavities offer high quality factor (Q-factor) and low mode volume [16] and are sensitive to size, shape and the surrounding refractive index [18]. The spectra of MBRs contain large number of WGMs due to its shape. The cleaned spectra have been obtained by coating the MBRs with WS2 flakes. The simulations indicate that the interaction of the WGMs of MBRs with the Mie scattering of WS2 flakes gives rise to the Fano [22,23,24]—type and electromagnetic induced transparency [25, 26] (EIT)-type resonances as well as the Autler Townes splitting (ATS) in the observed spectra.
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