Open AccessOptical confinement in the nanocoax: coupling to the fundamental TEM-like mode
Author(s) -
Yitzi M. Calm,
Luke D’Imperio,
Nathan T. Nesbitt,
Juan M. Merlo,
Aaron H. Rose,
Chaobin Yang,
Krzysztof Kempa,
Michael J. Burns,
Michael Naughton
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.402723
Subject(s) - materials science , optics , nanolithography , nanophotonics , extraordinary optical transmission , coaxial , nanoscopic scale , diffraction , optical vortex , polarimetry , numerical aperture , optoelectronics , beam (structure) , fabrication , surface plasmon , plasmon , surface plasmon polariton , wavelength , physics , scattering , nanotechnology , medicine , alternative medicine , pathology , electrical engineering , engineering
The nanoscale coaxial cable (nanocoax) has demonstrated optical confinement in the visible and the near infrared. We report on a novel nanofabrication process which yields optically addressable, sub-µm diameter, and high aspect ratio metal-insulator-metal nanocoaxes made by atomic layer deposition of Pt and Al 2 O 3 . We observe sub-diffraction-limited optical transmission via the fundamental, TEM-like mode by excitation with a radially polarized optical vortex beam. Our experimental results are based on interrogation with a polarimetric imager. Finite element method numerical simulations support these results, and their uniaxial symmetry was exploited to model taper geometries with both an electrically large volume, (15λ) 3 , and a nanoscopic exit aperture, (λ/200) 2 .