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Influence of Mg doping on the ultrafast electron dynamics of VO2 films

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Abstract

Broadband time-resolved measurements of pristine and Mg-doped vanadium dioxide (VO2) films are presented herein. The two films were synthesized on float glass and K-glass (SnO2 coated) substrates, respectively. Spectral and temporal dynamics of the insulator to metal transition are accessed via femtosecond pump-probe spectroscopy. Reflection and transmission signals were recorded during sample perturbation by high photon energy, 3.1 eV, laser pulses for below and above the transition threshold values of the excitation fluence. Changes of the spectral dynamics due to photoexcitation are tracked throughout the visible spectrum by use of broadband white-light supercontinuum pulses. The study demonstrates a faster temporal response of the Mg-doped film across the probed spectrum. The system is photoexcited to the metallic state reaching a plateau value in signal transmission within less than 5 ps post-pulse perturbation. These optimized trends of the Mg-doped VO2 films hold promise for applications necessitating ultrafast optical switching capabilities.

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Availability of data and materials

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code availability

All codes used for this study are available upon reasonable request.

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Acknowledgements

The authors would like to thank Prof. Dimitris Charalambidis for useful discussions on the data analysis.

Funding

DK acknowledges financial support from the IKY doctorate scholarship that is co-financed by Greece and the European Union (European Social Fund—ESF) through the Operational Programme Human Resources Development, Education and Lifelong Learning 2014–2020. This project has received funding from the EU-H 2020 research and innovation program under Grant Agreement No. 654360 having benefited from the access provided by FORTH (Foundation for Research and Technology–Hellas) within the framework of the NFFA‐Europe Transnational Access Activity. GEK acknowledges funding from the Hellenic Foundation for Research and Innovation (HFRI) and the General Secretariat for Research and Technology (GSRT), Under Project HANDCORE Grant Agreement No. [1789]. The authors acknowledge financial support from the European Union’s Horizon \(2020\) Research and Innovation Programme Under Grant Agreement No. 871124 Laserlab-Europe. The authors also acknowledge financial support from HELLAS-CH (MIS 5002735) implemented under “Action for Strengthening Research and Innovation Infrastructures,” funded by the Operational Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014–2020) and co-financed by Greece and the European Union (European Regional Development Fund).

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Authors and Affiliations

  1. Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 70013, Heraklion, Greece

    Dimitris Karanikolopoulos, Emmanouil Gagaoudakis, Sotiris Droulias, Maria Polychronaki, Georgios E. Katsoprinakis, Elias Aperathitis, Vassilis Binas, Constantinos Kalpouzos, George Kiriakidis, Alexandros Lappas & Panagiotis A. Loukakos

  2. Department of Physics, School of Sciences and Engineering, University of Crete, Heraklion, Greece

    Dimitris Karanikolopoulos, Georgios E. Katsoprinakis & Vassilis Binas

  3. Center of Materials Technology and Photonics, School of Engineering, Hellenic Mediterranean University, Crete, 71410, Heraklion, Greece

    Dimitrios Louloudakis, Kyriakos Mouratis, Dimitra Vernardou & Emmanuel Koudoumas

  4. Department of Physics, University of Patras, Patra, Greece

    Kyriakos Mouratis

  5. Department of Chemistry, School of Sciences and Engineering, University of Crete, Heraklion, Greece

    Maria Polychronaki

  6. Department of Electrical and Computer Engineering, School of Engineering, Hellenic Mediterranean University, 71410, Heraklion, Greece

    Dimitra Vernardou & Emmanuel Koudoumas

  7. Institute of Emerging Technologies, Hellenic Mediterranean University Center, 71410, Heraklion, Greece

    Dimitra Vernardou

Authors
  1. Dimitris Karanikolopoulos
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  2. Emmanouil Gagaoudakis
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  15. Panagiotis A. Loukakos
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Contributions

EK, AL and PL contributed to the study conception and design. DK and PL designed the experiment. EG, DL, KM, EA and DV prepared the samples and performed the characterization. SD elaborated the mathematical formulation. DK and MP conducted the optical experiments. KM developed the software for setup synchronization and data acquisition. DK developed the software for analysis of the data. DK, SD, GEK, CK, EK, AL and PL conducted the data analysis of the results. VB, GK, EK, AL and PL supervised the project and guided the research. All authors contributed to the discussion and preparation of the manuscript.

Corresponding author

Correspondence to Dimitris Karanikolopoulos.

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Karanikolopoulos, D., Gagaoudakis, E., Droulias, S. et al. Influence of Mg doping on the ultrafast electron dynamics of VO2 films. Appl. Phys. A 127, 751 (2021). https://doi.org/10.1007/s00339-021-04886-y

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