Abstract
Using strongly localized electromagnetic fields and efficiently coupled Mie resonances of two high-permittivity low-loss ceramic particles located at either side of a metallic aperture, we demonstrate total broadband transmission of microwaves, requiring no specific polarization, through a single subwavelength aperture. With radius 17 times smaller than the resonance wavelength, coupling efficiency is enhanced 12- and 300-fold over that attained for resonator-aperture and aperture-only couplings. The proposed approach can be tuned from microwave to optical bands to realize total transmissions.
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