title: Nonresonant broadband funneling of light via ultrasubwavelength channels.
abstract: Enhancing and funneling light efficiently through deep subwavelength apertures is essential in harnessing light-matter interaction. Thus far, this has been accomplished resonantly, by exciting the structural surface plasmons of perforated nanostructured metal films, a phenomenon known as extraordinary optical transmission. Here, we present a new paradigm structure which possesses all the capabilities of extraordinary optical transmission platforms, yet operates nonresonantly on a distinctly different mechanism. Our proposed platform demonstrates efficient ultrabroadband funneling of optical power confined in an area as small as ∼(λ/500)(2), where optical fields are enhanced, thus exhibiting functional possibilities beyond resonant platforms. We analyze the nonresonant mechanism underpinning such a phenomenon with a simple quasistatic picture, which shows excellent agreement with our numerical simulations.
authors: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gssubra@sandia.gov
authors: G
authors: G
authors: Subramania
authors: S
authors: S
authors: Foteinopoulou
authors: I
authors: I
authors: Brener