1.Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
2.Institute of Radiation Physics, Helmholtz Zentrum Dresden Rossendorf, 01328 Dresden, Germany
3.Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
Michael S. Spencer (spencer@fhi-berlin.mpg.de)
Sebastian F. Maehrlein (maehrlein@fhi-berlin.mpg.de)
收稿日期:2024-07-18,
修回日期:2024-10-29,
录用日期:2024-11-08,
网络出版日期:2025-02-06,
纸质出版日期:2025-03-31
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Electro-optic cavities for in-situ measurement of cavity fields[J]. LSA, 2025,14(3):732-745.
Spencer, M. S. et al. Electro-optic cavities for in-situ measurement of cavity fields. Light: Science & Applications, 14, 732-745 (2025).
Electro-optic cavities for in-situ measurement of cavity fields[J]. LSA, 2025,14(3):732-745. DOI: 10.1038/s41377-024-01685-x.
Spencer, M. S. et al. Electro-optic cavities for in-situ measurement of cavity fields. Light: Science & Applications, 14, 732-745 (2025). DOI: 10.1038/s41377-024-01685-x.
Cavity electrodynamics offers a unique avenue for tailoring ground-state material properties
excited-state engineering
and versatile control of quantum matter. Merging these concepts with high-field physics in the terahertz (THz) spectral range opens the door to explore low-energy
field-driven cavity electrodynamics
emerging from fundamental resonances or order parameters. Despite this demand
leveraging the full potential of field-driven material control in cavities is hindered by the lack of direct access to the intra-cavity fields. Here
we demonstrate a new concept of active cavities
consisting of electro-optic Fabry-Pérot resonators
which measure their intra-cavity electric fields on sub-cycle timescales. We thereby demonstrate quantitative retrieval of the cavity modes in amplitude and phase
over a broad THz frequency range. To enable simultaneous intra-cavity sampling alongside excited-state material control
we design a tunable multi-layer cavity
enabling deterministic design of hybrid cavities for polaritonic systems. Our theoretical models reveal the origin of the avoided crossings embedded in the intricate mode dispersion
and will enable fully-switchable polaritonic effects within arbitrary materials hosted by the hybrid cavity. Electro-optic cavities (EOCs) will therefore serve as integrated probes of light-matter interactions across all coupling regimes
laying the foundation for field-resolved intra-cavity quantum electrodynamics.
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