Issue 12, 2018

Sub-diffractional waveguiding by mid-infrared plasmonic resonators in semiconductor nanowires

Abstract

Chains of nanoscale plasmonic resonators are capable of sub-diffractional waveguiding and have applications in nanophotonics and thermal radiation transport. Practical uses have largely been limited, however, due to high optical losses or low group velocities. Here, we predict the waveguide performance of a material structure capable of overcoming these limitations: plasmonic resonators embedded in high-dielectric nanowires. Due to the enhanced near-field coupling between resonators, we find that the group velocities and propagation lengths for doped Si plasmonic resonators in intrinsic Si nanowires can be increased by up to an order of magnitude compared to the case of isotropic vacuum surroundings. We investigate the impact of resonator aspect ratio, doping, and spacing on waveguide performance, and we find that propagation lengths are maximized for large aspect ratios and high dopant concentrations at small spacings. To study these complex anisotropic systems, we develop a new analytical “absorption spectra” method to extract waveguide information from simple far-field absorption experiments (or simulations) of only two coupled resonators.

Graphical abstract: Sub-diffractional waveguiding by mid-infrared plasmonic resonators in semiconductor nanowires

Supplementary files

Article information

Article type
Paper
Submitted
25 1 2018
Accepted
07 3 2018
First published
08 3 2018

Nanoscale, 2018,10, 5708-5716

Author version available

Sub-diffractional waveguiding by mid-infrared plasmonic resonators in semiconductor nanowires

E. J. Tervo, D. S. Boyuk, B. A. Cola, Z. M. Zhang and M. A. Filler, Nanoscale, 2018, 10, 5708 DOI: 10.1039/C8NR00701B

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