Publication date: 21st July 2025
Ultrafast spectroscopy techniques with field resolution have been recently extended beyond the terahertz, into the visible, near and short-wave infrared region. While many realisations of these techniques rely on attosecond pulses to act as temporal gates to sample the electric field, it is possible to achieve field resolution with comparatively longer pulses on the order of 10-20fs.
Here, an experimental setup has been built to provide field information on femtosecond pulses as they pass through materials. Preliminary experiments with this setup to explore organic and inorganic, room-temperature, cavity polariton systems have performed. Here, our goal is to understand whether such field-resolved experiments, can visualise the ‘formation’ of cavity-polaritons, understand how the dynamics of cavity polaritons are influenced by the nature of light inside the cavity (shape of light pulse), and to build a blueprint of how to distinguish truly polaritonic effects in systems.
An outlook for the prospect of field resolved techniques e.g., in terms of data analysis is also presented, as well as how they may be extended to multi pulse of two-dimensional schemes, such as to provide information (amplitude and phase information) which may help with the interpretation of these complex spectroscopies.
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