Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption
Abstract
Coherent perfect absorption (CPA) describes the absence of all outgoing modes from a lossy resonator, driven by lossless incoming modes. Here, we show that for nanoresonators that also exhibit radiative losses, e.g. plasmonic nanoantennas, a generalized version of CPA (gCPA) can be applied. In gCPA outgoing modes are sup-pressed only for a subset of (guided plasmonic) modes while other (radiative) modes are treated as additional loss channels - a situation typically referred to as perfect impedance matching. Here we make use of gCPA to show how to achieve perfect impedance matching between a single nanowire plasmonic waveguide and a plasmonic nanoantenna. Antennas with both radiant and subradiant characteristics are considered. We further demonstrate potential applications in background-free sensing.
Keywords
Cite
@article{arxiv.1907.08174,
title = {Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption},
author = {Philipp Grimm and Gary Razinskas and Jer-Shing Huang and Bert Hecht},
journal= {arXiv preprint arXiv:1907.08174},
year = {2021}
}