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arXiv · 2511.03838

Single-shot near-field reconstruction of metamaterial dispersion

Eugene Koreshin·Denis Sakhno·Jim A. Enriquez·Pavel A. Belov
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Abstract

We present a single-shot near-field technique, where the near-field scan is performed on a single sample without repeating measurements or averaging over multiple samples, to reconstruct the isofrequency surfaces of metamaterials in the microwave regime. In our approach, we excite resonant modes using a fixed source in a resonator composed of the material under test and map the in-plane field distribution with a movable probe. Applying a fast Fourier transform (FFT) to the measured field reveals the sample's in-plane dispersion. By extending this analysis over multiple frequencies and comparing the results with Fabry-P\'erot resonances, we retrieve the full three-dimensional dispersion relation. When we apply the method to a double non-connected wire metamaterial, it accurately captures the low-frequency hyperbolic isofrequency surface, providing both a precise experimental tool and conceptual insight into spatially dispersive metamaterials.

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Eugene Koreshin, Denis Sakhno, Jim A. Enriquez, Pavel A. Belov. 2025-11-05. Single-shot near-field reconstruction of metamaterial dispersion. https://doi.org/10.1103/1hqf-wj91

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