Related Experiment Video
Updated: Jun 21, 2026
10:43
Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
Published on: July 21, 2023
Nanorod-mediated surface plasmon resonance sensor based on effective medium theory.
Junxue Fu1, Bosoon Park, Yiping Zhao
1Nanoscale Science and Engineering Center, Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA. fujunxue@physast.uga.edu
Applied Optics
|August 12, 2009
Summary
This study introduces a nanorod-enhanced surface plasmon resonance (SPR) sensor for improved sensitivity. Experimental results align with theoretical models, showing potential for advanced biosensing applications.
Area of Science:
- Nanotechnology
- Plasmonics
- Sensor Technology
Background:
- Surface Plasmon Resonance (SPR) sensors are crucial for label-free biosensing.
- Enhancing SPR sensitivity is critical for detecting low-concentration analytes.
- Nanorod structures offer unique optical properties for potential SPR enhancement.
Purpose of the Study:
- To theoretically and experimentally investigate nanorod-mediated SPR sensors for enhanced sensitivity.
- To analyze the impact of nanorod dimensions and environmental refractive index on SPR response.
- To compare nanorod-based SPR sensors with conventional thin metal film SPR configurations.
Main Methods:
- Utilized four-layer Fresnel equations and effective medium theory for theoretical modeling.
- Fabricated silver (Ag) nanorod array/Ag film substrates using oblique angle deposition.
- Characterized SPR responses using a laboratory-made SPR setup in air and deionized (DI) water.
Main Results:
- Theoretical analysis showed larger resonance angle shifts and increased sensitivity with higher analyte refractive indices for nanorod-mediated SPR.
- Experimental results demonstrated SPR angle shifts in Ag nanorods/Ag film samples compared to Ag film alone.
- Observed SPR angles shifted to larger angles in air for shorter nanorods, consistent with theoretical predictions.
Conclusions:
- Nanorod-mediated SPR sensors offer improved sensitivity compared to conventional SPR configurations.
- Theoretical insights are valuable for the practical fabrication and optimization of nanorod-based SPR sensors.
- This approach holds promise for developing next-generation, highly sensitive biosensing platforms.
