META 2021, META'12

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Sub-Wavelength Metallic Dimers: a Bright Transverse Bonding Mode Appears
Brice Rolly, Brian Stout, Nicolas Bonod

Last modified: 2012-01-06


It is widely assumed that the brightest mode in sub-wavelength metallic dimers is the longitudinal mode. However, when the size of the particles is somewhat large (around 100 nm diameter), one can no longer apply a quasi-static reasoning, even when the nanogap is small compared to the wavelength. Full propagation expressions show that the transverse bonding mode becomes the brightest mode for small nanogaps, and evidence the key role of the transverse dipolar coupling in this phenomenon.


plasmonics; metallic dimers; bright modes; dipolar coupling