Jump to main content
Jump to site search


Impact of metal crystallinity-related morphologies on the sensing performance of plasmonic nanohole arrays

Author affiliations

Abstract

Plasmonic nanohole arrays for biosensing applications have attracted tremendous attention because of their flexibility in optical signature design, high multiplexing capabilities, simple optical alignment setup, and high sensitivity. The quality of the metal film, including metal crystallinity and surface roughness, plays an important role in determining the sensing performance because the interaction between free electrons in the metal and incident light is strongly influenced by the metal surface morphology. We systematically investigated the influence of metal crystallinity-related morphologies on the sensing performance of plasmonic nanohole arrays after different metal deposition processes. We utilised several non-destructive nanoscale surface characterisation techniques to perform a quantitative and comparative analysis of the Au quality of the fabricated sensor. We found empirically how the surface roughness and grain sizes influence the permittivity of the Au film and thus the sensitivity of the fabricated sensor. Finally we confirmed that the deposition conditions that provide both low surface roughness and large metal grain sizes improve the sensitivity of the plasmonic sensor.

Graphical abstract: Impact of metal crystallinity-related morphologies on the sensing performance of plasmonic nanohole arrays

Back to tab navigation

Supplementary files

Article information


Submitted
22 Jan 2020
Accepted
08 Feb 2020
First published
11 Feb 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Impact of metal crystallinity-related morphologies on the sensing performance of plasmonic nanohole arrays

M. A. Khan, Y. Zhu, Y. Yao, P. Zhang, A. Agrawal and P. J. Reece, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR00619J

Social activity

Search articles by author

Spotlight

Advertisements