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Plasmonic Au Array SERS Substrate with Optimized Thin Film Oxide Substrate Layer.
Zachary T Brawley1,2, Stephen J Bauman3, Ahmad A Darweesh4
1Microelectronics-Photonics Graduate Program, University of Arkansas, 731 W. Dickson St., Fayetteville, Arkansas, AR 72701, USA. ztbrawle@email.uark.edu.
Materials (Basel, Switzerland)
|June 6, 2018
Summary
This study optimizes plasmonic array structures for enhanced optical surface sensing. By exploring larger nanowire spacing, researchers discovered new plasmonic modes for improved sensor response and fabrication.
Area of Science:
- Nanotechnology
- Materials Science
- Optics
Background:
- Plasmonic array structures are crucial for optical surface enhancement in sensing applications.
- Previous research indicated decreasing enhancement with nanowire spacing above 100 nm.
Purpose of the Study:
- To investigate the effect of plasmonic array structures and oxide substrates on optical surface enhancement.
- To extend the analysis of nanowire spacing beyond 100 nm and evaluate average surface enhancement.
- To optimize plasmonic wire geometries and oxide substrate thickness for enhanced sensor performance.
Main Methods:
- Utilized the finite element method (FEM) for numerical simulations.
- Analyzed optical surface enhancement across the entire device surface.
- Investigated varying nanowire spacing, geometries, and oxide substrate thicknesses.
Main Results:
- Optical enhancement can increase beyond 100 nm nanowire spacing due to additional plasmonic modes.
- Identified resonant modes dependent on nanowire dimensions, structure period, and incident light wavelength.
- Observed periodic oscillations in surface enhancement correlated with specific oxide thicknesses.
Conclusions:
- Optimized geometries for plasmonic array structures and oxide substrates can significantly improve optical surface enhancement.
- Findings enable more accessible fabrication of highly sensitive Surface-Enhanced Raman Spectroscopy (SERS) molecular sensors.
- This research provides a pathway for designing next-generation plasmonic sensors with tunable enhancement.
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