Plasmonic Gas Sensing based on Cavity-Coupled Metallic Nanoparticles
Optics
2017-03-27 v1
Abstract
Here we demonstrate the gas sensing ability of cavity-coupled metallic nanoparticle systems, comprising gold nanoparticles separated from a gold mirror with a polymer spacer. An increase in relative humidity (RH) causes the spacer to expand, which induces a significant reduction of nanoparticle scattering intensity, as the scattering is highly dependent on the cavity-nanoparticle coupling that closely relates to the nanoparticle-mirror distance. This lithography-free structure enables a remarkable averaging sensitivity at 0.12 dB/% RH and 0.25 dB/% RH over RH range (45-75%), possessing an estimated resolution better than 0.5% RH with full reversibility and almost zero-hysteresis, exhibiting notable gas sensing potentials.
Cite
@article{arxiv.1703.08276,
title = {Plasmonic Gas Sensing based on Cavity-Coupled Metallic Nanoparticles},
author = {Jian Qin and Yu-Hui Chen and Boyang Ding and Richard J. Blaikie and Min Qiu},
journal= {arXiv preprint arXiv:1703.08276},
year = {2017}
}