Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

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dc.contributor.authorVianna P.G.
dc.contributor.authorAlmeida A.D.S.
dc.contributor.authorGerosa R.M.
dc.contributor.authorBahamon D.A.
dc.contributor.authorDe Matos C.J.S.
dc.date.accessioned2024-03-12T19:21:41Z
dc.date.available2024-03-12T19:21:41Z
dc.date.issued2021
dc.description.abstract© The Royal Society of Chemistry.Monolayer transition-metal dichalcogenides (TMDCs) present high second-order optical nonlinearity, which is extremely desirable for, e.g., frequency conversion in nonlinear photonic devices. On the other hand, the atomic thickness of 2D materials naturally leads to low frequency converted intensities, highlighting the importance of designing structures that enhance the nonlinear response for practical applications. A number of methods to increase the pump electric field at 2D materials have been reported, relying on complex plasmonic and/or metasurface structures. Here, we take advantage of the fact that unstructured substrates with a low refractive index naturally maximize the pump field at a dielectric interface, offering a simple means to promote enhanced nonlinear optical effects. In particular, we measured second harmonic generation (SHG) in MoS2 and WS2 on fluorine tin oxide (FTO), which presents an epsilon-near zero point near our 1550 nm pump wavelength. Polarized SHG measurements reveal an SHG intensity that is one order of magnitude higher on FTO than on a glass substrate.
dc.description.firstpage272
dc.description.issuenumber1
dc.description.lastpage278
dc.description.volume3
dc.identifier.doi10.1039/d0na00779j
dc.identifier.issn2516-0230
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34724
dc.relation.ispartofNanoscale Advances
dc.rightsAcesso Aberto
dc.titleSecond-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate
dc.typeArtigo
local.scopus.citations19
local.scopus.eid2-s2.0-85099128069
local.scopus.subjectDesigning structures
local.scopus.subjectDielectric interface
local.scopus.subjectLow refractive index
local.scopus.subjectNonlinear optical effects
local.scopus.subjectNonlinear photonic devices
local.scopus.subjectSecond order optical nonlinearity
local.scopus.subjectTransition metal dichalcogenides
local.scopus.subjectUnstructured substrates
local.scopus.updated2024-11-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85099128069&origin=inward
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