A Femtosecond Magnetic Circular Dichroism Spectrometer
Abstract
We describe the development of a broadband magneto-optical spectrometer with femtosecond temporal resolution. The absorption spectrometer is based on a white-light supercontinuum (ca. 320 - 750 nm) using shot-to-shot temporal and spectral referencing at 1 kHz. Static and transient absorption spectra using circularly polarised light are collected in a magnetic field. The difference spectra with respect to the external field direction give the static and transient magneto-optical Faraday rotation (magnetic optical rotary dispersion) and ellipticity (magnetic circular dichroism) spectra. An achromatic quarter-wave plate is used and the impact of the deviation from ideal retardance on the spectra is discussed. Results from solution-based and thin-film samples are used to demonstrate the performance and wide applicability of the instrument. The sensitivities for the static and time-resolved data were found to be 5 and 0.4 mdeg, respectively. The method presents a simple way to measure magneto-optical spectra using a transient absorption spectrometer and an electromagnet.
Keywords
Cite
@article{arxiv.2107.10729,
title = {A Femtosecond Magnetic Circular Dichroism Spectrometer},
author = {Jake Sutcliffe and J. Olof Johansson},
journal= {arXiv preprint arXiv:2107.10729},
year = {2021}
}
Comments
The following article has been submitted to Review of Scientific Instruments