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Página principal > Artículos > Artículos publicados > A pre-time-zero spatiotemporal microscopy technique for the ultrasensitive determination of the thermal diffusivity of thin films |
Fecha: | 2023 |
Resumen: | 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. |
Ayudas: | Ministerio de Economía y Competitividad CEX2019-000910-S Ministerio de Ciencia e Innovación PGC2018-096875-BI00 European Commission 804349 European Commission 754510 Agencia Estatal de Investigación PID2019-111673GB-I00 Agencia Estatal de Investigación RYC-2017-22330 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1369 Ministerio de Economía y Competitividad SEV-2017-0706 |
Derechos: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió publicada |
Materia: | Microscopy technique ; Probe pulse ; Pump pulse ; Pump-probe microscopies ; Space and time ; Temperature profiles ; Thin-films ; Transient reflectivity ; Transport phenomenon ; Ultrasensitive |
Publicado en: | Review of Scientific Instruments, Vol. 94, Issue 3 (March 2023) , art. 34903, ISSN 1089-7623 |
11 p, 6.0 MB |