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
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.
2D materials, Fano resonances, Raman spectroscopy, microbottle resonators, whispering gallery modes
Bhattacharya, Shubhayan
d06038bd-c92a-4838-a01d-3ab58eaa715a
Veluthandath, Aneesh Vincent
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Bisht, Prem B.
42de6f45-9306-42e7-856e-c90cc980305d
October 2020
Bhattacharya, Shubhayan
d06038bd-c92a-4838-a01d-3ab58eaa715a
Veluthandath, Aneesh Vincent
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Bisht, Prem B.
42de6f45-9306-42e7-856e-c90cc980305d
Bhattacharya, Shubhayan, Veluthandath, Aneesh Vincent, Huang, Chung-Che, Murugan, Ganapathy Senthil and Bisht, Prem B.
(2020)
Effect of coating few-layer WS2 on the Raman spectra and whispering gallery modes of a microbottle resonator.
Journal of Optics, 22 (10), [105003].
(doi:10.1088/2040-8986/abad50).
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.
Text
Effect of coating few-layer WS2 on the Raman spectra and whispering gallery modes of a microbottle resonator
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More information
Accepted/In Press date: 7 August 2020
e-pub ahead of print date: 3 September 2020
Published date: October 2020
Keywords:
2D materials, Fano resonances, Raman spectroscopy, microbottle resonators, whispering gallery modes
Identifiers
Local EPrints ID: 443910
URI: http://eprints.soton.ac.uk/id/eprint/443910
ISSN: 2040-8986
PURE UUID: e484f7b6-0bd1-4fb9-bdcd-6fb6bb02e4b4
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Date deposited: 16 Sep 2020 16:35
Last modified: 17 Mar 2024 04:00
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Author:
Shubhayan Bhattacharya
Author:
Prem B. Bisht
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