Microscopy technique; Probe pulse; Pump pulse; Pump-probe microscopies; Space and time; Temperature profiles; Thin-films; Transient reflectivity; Transport phenomenon; Ultrasensitive; Instrumentation; Physics - Mesoscopic Systems and Quantum Hall Effect
Abstract :
[en] Diffusion is one of the most ubiquitous transport phenomena in nature. Experimentally, it can be tracked by following point spreading in space and time. Here, we introduce a spatiotemporal pump-probe microscopy technique that exploits the residual spatial temperature profile obtained through the transient reflectivity when probe pulses arrive before pump pulses. This corresponds to an effective pump-probe time delay of 13 ns, determined by the repetition rate of our laser system (76 MHz). This pre-time-zero technique enables probing the diffusion of long-lived excitations created by previous pump pulses with nanometer accuracy and is particularly powerful for following in-plane heat diffusion in thin films. The particular advantage of this technique is that it enables quantifying thermal transport without requiring any material input parameters or strong heating. We demonstrate the direct determination of the thermal diffusivities of films with a thickness of around 15 nm, consisting of the layered materials MoSe2 (0.18 cm2/s), WSe2 (0.20 cm2/s), MoS2 (0.35 cm2/s), and WS2 (0.59 cm2/s). This technique paves the way for observing nanoscale thermal transport phenomena and tracking diffusion of a broad range of species.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Varghese, Sebin ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Mehew, Jake Dudley ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Block, Alexander ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Reig, David Saleta ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Woźniak, Paweł ; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
Farris, Roberta ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Zanolli, Zeila ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures ; Chemistry Department and ETSF, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, The Netherlands
Ordejón, Pablo ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Verstraete, Matthieu ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
van Hulst, Niek F ; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
Tielrooij, Klaas-Jan ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST & CSIC, Campus UAB, Bellaterra (Barcelona) 08193, Spain
Language :
English
Title :
A pre-time-zero spatiotemporal microscopy technique for the ultrasensitive determination of the thermal diffusivity of thin films.
ICN2 was supported by the Severo Ochoa program from Spanish MINECO Grant No. SEV-2017-0706. S.V. and D.S.R. acknowledge the support of the Spanish Ministry of Economy through FPI-SO2018 and FPI-SO2019, respectively. K.-J.T. acknowledges funding from the European Union’s Horizon 2020 Research and Innovation program under Grant Agreement No. 804349 (ERC StG CUHL), RYC fellowship No. RYC-2017-22330 and IAE Project No. PID2019-111673GB-I00. ICFO was supported by the Severo Ochoa program for Centers of Excellence in R&D (CEX2019-000910-S), Fundació Privada Cellex, Fundació Privada Mir-Puig, and the Generalitat de Catalunya through the CERCA program. P.W. acknowledges funding from the European Union’s Horizon 2020 Research and Innovation program under the Marie Skłodowska-Curie Grant Agreement No. 754510 (PROBIST). N.F.v.H. acknowledges funding by the European Commission (ERC AdG 670949-LightNet), the Spanish Plan Nacional (PGC2018-096875-BI00), and the Catalan AGAUR (2017SGR1369). M.J.V. acknowledges support from Fédération Wallonie Bruxelles and ULiège (ARC project DREAMS G.A. 21/25-11). Z.Z. acknowledges the research program “Materials for the Quantum Age” (QuMAt) for financial support. This program (Registration No. 024.005.006) is part of the Gravitation program financed by the Dutch Ministry of Education, Culture and Science (OCW). We acknowledge PRACE computing time on MareNostrum4 at Barcelona Supercomputing Center (OptoSpin id. 2020225411).
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