Data from: Extended nonradiative dipole-dipole energy transfer and spatiotemporal coherence enabled by bound states in the continuum

Breaking the fundamental distance limit of dipole–dipole interactions is
key to enabling scalable quantum and photonic technologies. Conventional
non-radiative energy transfer (FRET) is intrinsically confined to deep
subwavelength distances, limiting its scalability. Here, we demonstrate
millimeter-scale, coherent dipole–dipole energy transfer enabled by
nonradiative bound states in the continuum (BICs) in a gold metasurface.
Using a custom terahertz near-field time-domain microscope with dipolar
emitter–detector probes, we observe strongly anisotropic energy transfer
enhanced along one axis, where BIC modes establish long-range
spatiotemporal coherence, and suppressed along the orthogonal axis. By
systematically reducing the array size, we reveal that energy transfer
efficiency and spatiotemporal coherence are maximized at the
metasurface's center, where boundary-induced scattering is minimized.
These findings establish BICs and quasi-BICs as robust, non-radiative
channels for extended, directional, and coherence-preserving dipolar
interactions, providing a versatile platform for quantum communication,
integrated nanophotonics, and biosensing technologies.