Abstract
Experiments reveal a new family of optical fields that originate at the boundary between a nanostructure and an incident light source, offering new paths for controlling optical behavior in a wide range of technologies.
Highlights
Physical interactions typically occur within a structure, designed to concentrate the continuous distribution of system states around discrete eigenstates
We propose and implement the concept of nonmodal plasmonics, rooted in the fact that light sources and nanostructures actively share a principal set of discrete optical degrees of freedom
We discover a new class of plasmonic DOFs, identified not with the modes of photonic nanostructures but with the discrete antiresonances that form when those nanostructures are being driven by a light source
Summary
Physical interactions typically occur within a structure, designed to concentrate the continuous distribution of system states around discrete eigenstates. These discrete eigenstates constitute the principal degrees of freedom (DOFs) controlling the predominant mechanisms of interaction. Whereas SPPs are discrete resonances of free plasmonic oscillations, APPs are the discrete antiresonances emerging when those oscillations are being forced by a light source [Figs. These SPP-APP pair excitations, we demonstrate that ultrathin gold films (approximately 11 nm) can appear “black”: exhibiting a surprisingly strong angularly and spectrally wideband absorption (FWHM Δθ ≈ 47°, Δλ > 1.34 μm). We derive design rules to engineer highly absorbing ultrathin films accurately and efficiently based on the unique properties of SPP-APP pairs
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