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Layered Wire-Grid Haloscope for Millielectronvolt Axions and Dark Photons
Abstract
We propose MADGRID (Millielectronvolt Axions and Dark photons with layered GRIDs), a few wire grids in front of a mirror, tuned by their spacing, forming an epsilon-near-zero slab that radiates through its face into external optics. Unlike wire-plasma haloscopes, the signal need not cross the lossy medium to reach an antenna, and metal grids replace the disks of dielectric haloscopes. A 1 m2 array in 10 T could probe axion-photon couplings below the CAST bound up to 1.4 meV with kinetic-inductance detectors, and KSVZ couplings over 0.8-3.9 meV with future photon counters. Without a magnet, it could probe dark photon mixings down to 3.4×10−16.
Related
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BibTeX
@misc{caputo2026layered,
title = {{Layered Wire-Grid Haloscope for Millielectronvolt Axions and Dark Photons}},
author = {Andrea Caputo},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40793},
eprint = {2610.40793},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40793},
}
RIS
TY - UNPB
TI - Layered Wire-Grid Haloscope for Millielectronvolt Axions and Dark Photons
AU - Andrea Caputo
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40793
UR - https://arxiv.org/abs/2610.40793
AB - We propose MADGRID (Millielectronvolt Axions and Dark photons with layered GRIDs), a few wire grids in front of a mirror, tuned by their spacing, forming an epsilon-near-zero slab that radiates through its face into external optics. Unlike wire-plasma haloscopes, the signal need not cross the lossy medium to reach an antenna, and metal grids replace the disks of dielectric haloscopes. A 1 m^2 array in 10 T could probe axion-photon couplings below the CAST bound up to 1.4 meV with kinetic-inductance detectors, and KSVZ couplings over 0.8-3.9 meV with future photon counters. Without a magnet, it could probe dark photon mixings down to 3.4×10^−16.
ER -