Giant two-photon absorption in MXene quantum dots

Looking for materials with compelling nonlinear optical (NLO) response is of great importance for next-generation nonlinear nanophotonics. We demonstrate an escalated two-photon absorption (TPA) in ultrasmall niobium carbide quantum dots (Nb C QDs) that is induced by a two-even-parity states transit...

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Bibliographic Details
Published in:Optics express 2022-03, Vol.30 (6), p.8482-8493
Main Authors: Wei, Hao, Wang, Yiduo, Wang, Yingwei, Fan, Wenxuan, Zhou, Li, Long, Mengqiu, Xiao, Si, He, Jun
Format: Article
Language:English
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Summary:Looking for materials with compelling nonlinear optical (NLO) response is of great importance for next-generation nonlinear nanophotonics. We demonstrate an escalated two-photon absorption (TPA) in ultrasmall niobium carbide quantum dots (Nb C QDs) that is induced by a two-even-parity states transition. The TPA response of Nb C QDs was observed in the near-infrared band of 1064-1550 nm. Surprisingly, at 1064 nm, Nb C QDs shows an enhanced TPA response than other wavelengths with a nonlinear absorption coefficient up to a value of 0.52 ± 0.05 cm/GW. Additionally, the nonlinear optical response of Nb C changes to saturable absorption when the incident wavelength is between 400-800 nm wavelength. Density functional theory (DFT) validates that TPA, induced by two even-parity states transition, breaks the forbidden single-photon transition, enabling a tremendous TPA response in Nb C QDs at 1064 nm. It offers the possibility of manipulating the NLO response of Nb C via morphology or surface termination.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.450617