NDLI: FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

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FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

Content Provider	MDPI
Author	Gomez-Cruz, Juan Bdour, Yazan Stamplecoskie, Kevin Escobedo, Carlos
Copyright Year	2022
Description	Metallic nanoparticles (MNPs) and metallic nanostructures are both commonly used, independently, as SERS substrates due to their enhanced plasmonic activity. In this work, we introduce and investigate a hybrid nanostructure with strong SERS activity that benefits from the collective plasmonic response of the combination of MNPs and flow-through nanohole arrays (NHAs). The electric field distribution and electromagnetic enhancement factor of hybrid structures composed of silver NPs on both silver and gold NHAs are investigated via finite-difference time-domain (FDTD) analyses. This computational approach is used to find optimal spatial configurations of the nanoparticle positions relative to the nanoapertures and investigate the difference between Ag-NP-on-Ag-NHAs and Ag-NP-on-Au-NHAs hybrid structures. A maximum $G_{SERS}$ value of 6.8 × $10^{9}$ is achieved with the all-silver structure when the NP is located 0.5 nm away from the rim of the NHA, while the maximum of 4.7 × $10^{10}$ is obtained when the nanoparticle is in full contact with the NHA for the gold-silver hybrid structure. These results demonstrate that the hybrid nanostructures enable hotspot formation with strong SERS activity and plasmonic enhancement compatible with SERS-based sensing applications.
Starting Page	128
e-ISSN	20796374
DOI	10.3390/bios12020128
Journal	Biosensors
Issue Number	2
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-02-17
Access Restriction	Open
Subject Keyword	Biosensors Imaging Science Metallic Nanoparticles Nanohole Arrays Fdtd Sers-active Structures Hotspots
Content Type	Text
Resource Type	Article

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