Ultra Electron Density Sensitivity for Surface Plasmons
Optics
2023-07-12 v1 Mesoscale and Nanoscale Physics
Abstract
We investigate surface plasmons from a solid-state standpoint and highlight their ultra electron density sensitivity. When a surface plasmon is excited on a planar gold film by an evanescent wave from 625 nm incident light, only a minute fraction of the surface electron density, approximately one thousandth, participates in the process. By introducing a noise-depressed surface potential modulation, we reduce the electron density to the order of 10 um-2, enabling electron sensitivity on the order of 0.1 e. As a practical application, we develop a surface plasmon resonance imaging method capable of detecting single anions in solution at a concentration of 1 aM.
Cite
@article{arxiv.2307.04982,
title = {Ultra Electron Density Sensitivity for Surface Plasmons},
author = {Wei Liu and Meng Li and Yu Niu and Ziren Luo},
journal= {arXiv preprint arXiv:2307.04982},
year = {2023}
}
Comments
arXiv admin note: text overlap with arXiv:2305.11378