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arXiv · 2604.19311

Background-free calibrated electric-field imaging with Rydberg-state fluorescence and Autler-Townes splitting

Gabriel Ko·Wiktor Krokosz·Mateusz Mazelanik·Wojciech Wasilewski·Michał Parniak
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Abstract

We demonstrate a spatially resolved method for imaging millimeter-wave (mmWave) electric fields using Rydberg-state fluorescence in a warm atomic vapor. By utilizing a multi-photon ladder excitation scheme, we leverage a specific decay channel that remains dark in the absence of the mmWave field, resulting in high-contrast imaging with effectively zero background. Absolute calibration of the local electric field is achieved by reconstructing the Autler-Townes splitting of the Rydberg resonance across the imaging volume. To ensure robust field extraction across a wide dynamic range--including regimes where spectral features are not fully resolved--we employ a steady-state analysis based on the Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) master equation. We apply this technique to visualize standing-wave interference patterns within a vapor cell and demonstrate the ability to engineer local field distributions using structured dielectric reflectors. This approach provides a versatile and self-calibrating platform for the diagnostic imaging of high-frequency electromagnetic fields and the characterization of mmWave-optical interfaces.

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Gabriel Ko, Wiktor Krokosz, Mateusz Mazelanik, Wojciech Wasilewski, Michał Parniak. 2026-04-21. Background-free calibrated electric-field imaging with Rydberg-state fluorescence and Autler-Townes splitting. https://doi.org/10.1364/oe.601412

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