Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption

Nanophotonics

article

Philipp Grimm¹  Gary Razinskas¹  Jer-Shing Huang²  Bert Hecht¹ 

[1] Nano-Optics & Biophotonics Group, Department of Experimental Physics 5, University of Würzburg;Leibniz Institute of Photonic Technology;Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-Universität Jena;Research Center for Applied Sciences;Department of Electrophysics, National Chiao Tung University

关键词: coherent perfect absorption;    impedance matching;    plasmonics;    nanoantenna;   

DOI  :  10.1515/nanoph-2021-0048

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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 suppressed 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.

【 授权许可】

CC BY