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Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide
We report strong second-harmonic generation (SHG) from 2H polytype of multilayer Tin diselenide (SnSe(2)) for fundamental excitation close to the indirect band-edge in the absence of excitonic resonances. Comparison of SHG and Raman spectra from exfoliated SnSe(2) flakes of different polytypes shows...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8298440/ https://www.ncbi.nlm.nih.gov/pubmed/34294863 http://dx.doi.org/10.1038/s41598-021-94612-8 |
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author | Biswas, Rabindra Dandu, Medha Prosad, Asish Das, Sarthak Menon, Sruti Deka, Jayanta Majumdar, Kausik Raghunathan, Varun |
author_facet | Biswas, Rabindra Dandu, Medha Prosad, Asish Das, Sarthak Menon, Sruti Deka, Jayanta Majumdar, Kausik Raghunathan, Varun |
author_sort | Biswas, Rabindra |
collection | PubMed |
description | We report strong second-harmonic generation (SHG) from 2H polytype of multilayer Tin diselenide (SnSe(2)) for fundamental excitation close to the indirect band-edge in the absence of excitonic resonances. Comparison of SHG and Raman spectra from exfoliated SnSe(2) flakes of different polytypes shows strong (negligible) SHG and Raman E(g) mode at 109 cm(−1) (119 cm(−1)), consistent with 2H (1T) polytypes. The difference between the A(1g)–E(g) Raman peak positions is found to exhibit significant thickness dependent for the 1T form, which is found to be absent for the 2H form. The observed thickness dependence of SHG with rapid oscillations in signal strength for small changes in flake thickness are in good agreement with a nonlinear wave propagation model considering nonlinear polarization with alternating sign from each monolayer. The nonlinear optical susceptibility extracted from SHG signal comparison with standard quartz samples for 1040 nm excitation is found to be more than 4-times higher than that at 1550 nm. This enhanced nonlinear response at 1040 nm is attributed to the enhanced nonlinear optical response for fundamental excitation close to the indirect band-edge. We also study SHG from heterostructures of monolayer MoS(2)/multilayer SnSe(2) which allows us to unambiguously compare the nonlinear optical response of SnSe(2) with MoS(2). We find the SHG signal and any interference effect in the overlap region to be dominated by the SnSe(2) layer for the excitation wavelengths considered. The comparison of SHG from SnSe(2) and MoS(2) underscores that the choice of the 2D material for a particular nonlinear optical application is contextual on the wavelength range of interest and its optical properties at those wavelengths. The present works further highlights the usefulness of near band-edge enhancement of nonlinear processes in emerging 2D materials towards realizing useful nanophotonic devices. |
format | Online Article Text |
id | pubmed-8298440 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-82984402021-07-23 Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide Biswas, Rabindra Dandu, Medha Prosad, Asish Das, Sarthak Menon, Sruti Deka, Jayanta Majumdar, Kausik Raghunathan, Varun Sci Rep Article We report strong second-harmonic generation (SHG) from 2H polytype of multilayer Tin diselenide (SnSe(2)) for fundamental excitation close to the indirect band-edge in the absence of excitonic resonances. Comparison of SHG and Raman spectra from exfoliated SnSe(2) flakes of different polytypes shows strong (negligible) SHG and Raman E(g) mode at 109 cm(−1) (119 cm(−1)), consistent with 2H (1T) polytypes. The difference between the A(1g)–E(g) Raman peak positions is found to exhibit significant thickness dependent for the 1T form, which is found to be absent for the 2H form. The observed thickness dependence of SHG with rapid oscillations in signal strength for small changes in flake thickness are in good agreement with a nonlinear wave propagation model considering nonlinear polarization with alternating sign from each monolayer. The nonlinear optical susceptibility extracted from SHG signal comparison with standard quartz samples for 1040 nm excitation is found to be more than 4-times higher than that at 1550 nm. This enhanced nonlinear response at 1040 nm is attributed to the enhanced nonlinear optical response for fundamental excitation close to the indirect band-edge. We also study SHG from heterostructures of monolayer MoS(2)/multilayer SnSe(2) which allows us to unambiguously compare the nonlinear optical response of SnSe(2) with MoS(2). We find the SHG signal and any interference effect in the overlap region to be dominated by the SnSe(2) layer for the excitation wavelengths considered. The comparison of SHG from SnSe(2) and MoS(2) underscores that the choice of the 2D material for a particular nonlinear optical application is contextual on the wavelength range of interest and its optical properties at those wavelengths. The present works further highlights the usefulness of near band-edge enhancement of nonlinear processes in emerging 2D materials towards realizing useful nanophotonic devices. Nature Publishing Group UK 2021-07-22 /pmc/articles/PMC8298440/ /pubmed/34294863 http://dx.doi.org/10.1038/s41598-021-94612-8 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Biswas, Rabindra Dandu, Medha Prosad, Asish Das, Sarthak Menon, Sruti Deka, Jayanta Majumdar, Kausik Raghunathan, Varun Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title | Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title_full | Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title_fullStr | Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title_full_unstemmed | Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title_short | Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide |
title_sort | strong near band-edge excited second-harmonic generation from multilayer 2h tin diselenide |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8298440/ https://www.ncbi.nlm.nih.gov/pubmed/34294863 http://dx.doi.org/10.1038/s41598-021-94612-8 |
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