Ultrathin plasmonic nanogratings for rapid and highly-sensitive detection
Abstract
We developed a nanoplasmonic sensor platform employing the extraordinary optical properties of one-dimensional nanogratings patterned on 30nm-thick ultrathin Ag films. Excitation of Fano resonances in the ultrathin Ag nanogratings results in transmission spectra with high amplitude, large contrast, and narrow bandwidth, making them well-suited for rapid and highly-sensitive sensing applications. The ultrathin nanoplasmonic sensor chip was integrated with a polydimethylsiloxane (PDMS) microfluidic channel, and the measured refractive index resolution was found to be 1.46x10-6 refractive index units (RIU) with a high temporal resolution of 1 sec. This compares favorably with commercial prism-based surface plasmon resonance sensors, but is achieved using a more convenient collinear transmission geometry and a significantly smaller sensor footprint of 50x50um2. In addition, an order-of-magnitude improvement in the temporal and spatial resolutions was achieved relative to state-of-the-art nanoplasmonic sensors, for comparable detection resolutions.
Keywords
Cite
@article{arxiv.1410.3716,
title = {Ultrathin plasmonic nanogratings for rapid and highly-sensitive detection},
author = {Beibei Zeng and Yongkang Gao and Filbert J. Bartoli},
journal= {arXiv preprint arXiv:1410.3716},
year = {2014}
}
Comments
11 pages, 3 figures, 1 table