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19 April 2024

» arxiv » 1912.5338

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Ultrafast Tracking of Exciton and Charge Carrier Transport in Optoelectronic Materials on the Nanometer Scale
Christoph Schnedermann ; Jooyoung Sung ; Raj Pandya ; Sachin Dev Verma ; Richard Y. S. Chen ; Nicolas Gauriot ; Hope M. Bretscher ; Philipp Kukura ; Akshay Rao ;
Date:	11 Dec 2019
Abstract:	We present a novel optical transient absorption and reflection microscope based on a diffraction-limited pump pulse in combination with a wide-field probe pulse, for the spatio-temporal investigation of ultrafast population transport in thin films. The microscope achieves a temporal resolution down to 12 fs and simultaneously provides sub-10 nm spatial accuracy. We demonstrate the capabilities of the microscope by revealing an ultrafast excited-state exciton population transport of up to 32 nm in a thin film of pentacene and by tracking the carrier motion in p-doped silicon. The use of few-cycle optical excitation pulses enables impulsive stimulated Raman micro-spectroscopy, which is used for in-situ verification of the chemical identity in the 100 - 2000 cm-1 spectral window. Our methodology bridges the gap between optical microscopy and spectroscopy allowing for the study of ultrafast transport properties down to the nanometer length scale.
Source:	arXiv, 1912.5338
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