journal article·2020-05Open access

Two‐Photon Absorption in Monolayer MXenes

Gaozhong Wang, Daniel Bennett, Chuanfang (John) Zhang, Cormac Ó Coileáin, Meiying Liang, Niall McEvoy, Jing Jing Wang, Jun Wang, Kangpeng Wang, Valeria Nicolosi, Werner J. Blau

Advanced Optical Materials· Volume 8· Issue 9

Abstract

Abstract Two‐photon absorption (2PA) is a nonlinear optical (NLO) effect that typically occurs in a conventional semiconductor whose bandgap is larger than the energy of one excited photon but smaller than the energy of two photons. In this work, the experimental observation of strong 2PA in gapless MXene monolayers is reported. This phenomenon is verified by a nonlinear transmission method and ultrafast dynamic studies based on a wavelength‐degenerate, non‐collinear pump‐probe technique. The unconventional 2PA is attributed to the structures of the MXene energy bands near the Fermi level, which favors two‐photon transitions and suppresses one‐photon transitions due to parallel band absorption effects. These results, as well as the measured NLO parameters including the 2PA coefficient, absorption cross‐section, excited carrier lifetimes, and third‐order NLO susceptibility, provide a systematic understanding of the unusual NLO effect in MXenes and may be applied in advanced photonic and optoelectronic devices.
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Research context

OpenAlex topics: 2D Materials and Applications · Advanced Fiber Laser Technologies · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics CRANN and AMBER Trinity College Dublin Dublin 2 D02 Ireland

Theory of Condensed Matter Cavendish Laboratory University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK

School of Chemistry and AMBER Trinity College Dublin Dublin 2 D02 Ireland

Laboratory of Micro‐Nano Photonic and Optoelectronic Materials and Devices Key Laboratory of Materials for High‐Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 P. R. China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China

Department of Electrical Engineering and Solid‐State Institute Technion‐Israel Institute of Technology Haifa 32000 Israel

Funding

Science Foundation Ireland · Engineering and Physical Sciences Research Council

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