Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Biswas, Rabindra, Dandu, Medha, Prosad, Asish, Das, Sarthak, Menon, Sruti, Deka, Jayanta, Majumdar, Kausik, Raghunathan, Varun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
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
_version_ 1783726063760703488
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
work_keys_str_mv AT biswasrabindra strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT dandumedha strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT prosadasish strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT dassarthak strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT menonsruti strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT dekajayanta strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT majumdarkausik strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide
AT raghunathanvarun strongnearbandedgeexcitedsecondharmonicgenerationfrommultilayer2htindiselenide