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Inspired by the acoustic Helmholtz resonator, we propose a slit-boxelectromagnetic nanoantenna able to concentrate the energy of an incident beaminto surfaces a thousand times smaller than with a classical lens. This designgives birth to giant field intensity enhancement in hot volume, throughout theslit. It reaches $10^4$ in the visible up to $10^8$ in the THz range even withfocused beams thanks to an omnidirectional reception. These properties couldtarget applications requiring extreme light concentration, such as SEIRA,non-linear optics and biophotonics.

Giant field enhancement by funneling effect into sub-wavelength slit-box resonators