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Light funneling mechanism explained by magnetoelectric interference

, : Light funneling mechanism explained by magnetoelectric interference. Physical Review Letters 107(9): 093902-093902

We investigate the mechanisms involved in the funneling of optical energy into subwavelength grooves etched on a metallic surface. The key phenomenon is unveiled thanks to the decomposition of the electromagnetic field into its propagative and evanescent parts. We unambiguously show that the funneling is not due to plasmonic waves flowing toward the grooves, but rather to the magnetoelectric interference of the incident wave with the evanescent field, this field being mainly due to the resonant wave escaping from the groove.


PMID: 21929243

DOI: 10.1103/PhysRevLett.107.093902

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