Impact of Surface Roughness in Nanogap Plasmonic Systems
Name
2001.08953.pdf
Description
Submitted version
Size
4.6 MB
Format
Adobe PDF
Checksum (MD5)
70ba1e9f80a6a2d85dbfb73bde5927c8
Author(s)
Ciracì, Cristian
Vidal-Codina, Ferran
Yoo, Daehan
Peraire, Jaime
Oh, Sang-Hyun
Smith, David R
Date Issued
2020
Journal
ACS Photonics
Publisher
American Chemical Society (ACS)
Version
Original manuscript
Abstract
© 2020 American Chemical Society. Recent results have shown unprecedented control over separation distances between two metallic elements hundreds of nanometers in size, underlying the effects of free-electron nonlocal response also at mid-infrared wavelengths. Most of metallic systems, however, still suffer from some degree of inhomogeneity due to fabrication-induced surface roughness. Nanoscale roughness in such systems might hinder the understanding of the role of microscopic interactions. Here we investigate the effect of surface roughness in coaxial nanoapertures resonating at mid-infrared frequencies. We show that, although random roughness shifts the resonances in an unpredictable way, the impact of nonlocal effects can still be clearly observed. Roughness-induced perturbation on the peak resonance of the system shows a strong correlation with the effective gap size of the individual samples. Fluctuations due to fabrication imperfections then can be suppressed by performing measurements on structure ensembles in which averaging over a large number of samples provides a precise measure of the ideal system's optical properties.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/ACSPHOTONICS.0C00099
