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Surface-enhanced Raman spectroscopy long-range detection investigation based on the alternating coupling of a surface
Applied Optics
|September 14, 2023
Summary
This study introduces a novel Surface-Enhanced Raman Spectroscopy (SERS) sensor. The design achieves high sensitivity for detecting low-concentration samples, enabling long-range, nondestructive analysis.
Area of Science:
- Plasmonics
- Spectroscopy
- Nanophotonics
Background:
- Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for detecting trace analytes.
- Existing SERS sensors face challenges in sensitivity and sample interaction.
- Optimizing evanescent field coupling is crucial for enhancing SERS performance.
Purpose of the Study:
- To theoretically investigate a novel SERS sensor design.
- To optimize the coupling efficiency of evanescent fields.
- To achieve sensitive, long-range, and nondestructive detection of low-concentration samples.
Main Methods:
- Design of a SERS sensor integrating a surface plasmonic array with a dielectric waveguide.
- Systematic theoretical study of incident angle effects on evanescent field coupling efficiency.
- Analysis of sensor performance, including transmission length and enhancement factor.
Main Results:
- Maximum evanescent field coupling efficiency achieved at an incident angle of 66°.
- The proposed SERS sensor exhibits a transmission length of 1.027 cm.
- A high enhancement factor of 1.574×10⁴ was obtained at 633 nm.
Conclusions:
- The integrated plasmonic array and dielectric waveguide enhance SERS detection.
- The sensor design allows for long-range, nondestructive detection of low-concentration analytes.
- This approach offers a promising platform for sensitive molecular detection.
