Compressive imaging of transient absorption dynamics on the femtosecond timescale

0509923 - ÚFP 2020 RIV US eng J - Článek v odborném periodiku
Denk, Ondřej - Zheng, K. - Zigmantas, D. - Žídek, Karel
Compressive imaging of transient absorption dynamics on the femtosecond timescale.
Optics Express. Roč. 27, č. 7 (2019), s. 10234-10246. ISSN 1094-4087
Grant CEP: GA ČR(CZ) GJ17-26284Y
GRANT EU: European Commission(XE) 654148 - LASERLAB-EUROPE
Institucionální podpora: RVO:61389021
Klíčová slova: cdse quantum dots * rhodamine 6g * electron * spectroscopy * fluorescence * light * films
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 3.669, rok: 2019
Způsob publikování: Open access
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-7-10234

Femtosecond spectroscopy is an important tool used for tracking rapid photoinduced processes in a variety of materials. To spatially map the processes in a sample would substantially expand the method's capabilities. This is, however, difficult to achieve, due to the necessity of using low-noise detection and maintaining feasible data acquisition time. Here, we demonstrate realization of an imaging pump-probe setup, featuring sub-100 fs temporal resolution, by using a straightforward modification of a standard pump-probe technique, which uses a randomly structured probe beam. The structured beam, made by a diffuser, enabled us to computationally reconstruct the maps of transient absorption dynamics based on the concept of compressed sensing. We demonstrate the setup's functionality in two proof-of-principle experiments, where we achieve spatial resolution of 20 mu m. The presented concept provides a feasible route to imaging, by using the pump-probe technique and ultrafast spectroscopy in general.
Trvalý link: http://hdl.handle.net/11104/0300513