Refractive index sensing and surface-enhanced Raman spectroscopy using silver–gold layered bimetallic plasmonic crystals
| Autor: | Tae-Woo Lee, An Phong Le, Somi Kang, Rohit Bhargava, Matthew V. Schulmerich, Stephen Gray, Sean E. Lehman, Ralph G. Nuzzo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
finite-difference time-domain
Materials science Fabrication General Physics and Astronomy Physics::Optics 02 engineering and technology lcsh:Chemical technology lcsh:Technology 01 natural sciences Full Research Paper plasmonics symbols.namesake nanoimprint soft lithography 0103 physical sciences Nanotechnology lcsh:TP1-1185 General Materials Science Electrical and Electronic Engineering Surface plasmon resonance lcsh:Science 010306 general physics Bimetallic strip Nanoscopic scale Plasmon lcsh:T business.industry Surface-enhanced Raman spectroscopy 021001 nanoscience & nanotechnology lcsh:QC1-999 Nanoscience symbols Optoelectronics lcsh:Q 0210 nano-technology business Raman spectroscopy Refractive index lcsh:Physics surface plasmon resonance |
| Zdroj: | Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 2492-2503 (2017) |
| ISSN: | 2190-4286 |
| Popis: | Herein we describe the fabrication and characterization of Ag and Au bimetallic plasmonic crystals as a system that exhibits improved capabilities for quantitative, bulk refractive index (RI) sensing and surface-enhanced Raman spectroscopy (SERS) as compared to monometallic plasmonic crystals of similar form. The sensing optics, which are bimetallic plasmonic crystals consisting of sequential nanoscale layers of Ag coated by Au, are chemically stable and useful for quantitative, multispectral, refractive index and spectroscopic chemical sensing. Compared to previously reported homometallic devices, the results presented herein illustrate improvements in performance that stem from the distinctive plasmonic features and strong localized electric fields produced by the Ag and Au layers, which are optimized in terms of metal thickness and geometric features. Finite-difference time-domain (FDTD) simulations theoretically verify the nature of the multimode plasmonic resonances generated by the devices and allow for a better understanding of the enhancements in multispectral refractive index and SERS-based sensing. Taken together, these results demonstrate a robust and potentially useful new platform for chemical/spectroscopic sensing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|