| Autor: |
Tervo EJ; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. zhuomin.zhang@me.gatech.edu., Boyuk DS; School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. mfiller@gatech.edu., Cola BA; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. zhuomin.zhang@me.gatech.edu and School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA., Zhang ZM; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. zhuomin.zhang@me.gatech.edu., Filler MA; School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. mfiller@gatech.edu. |
| Abstrakt: |
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. |
