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Surface enhanced infrared spectroscopy with gold strip gratings
Tao Wang1, Vu Hoa Nguyen, Andreas Buchenauer
11st Institute of Physics (1A), RWTH Aachen University, 52056 Aachen, Germany.
Optics Express
|April 11, 2013
Summary
We demonstrate a simple method for surface-enhanced infrared absorption (SEIRA) spectroscopy using gold strip gratings. This technique achieves a high enhancement factor, making it promising for molecular detection.
Area of Science:
- Plasmonics and Spectroscopy
- Nanofabrication
Background:
- Surface-enhanced infrared absorption (SEIRA) spectroscopy offers high sensitivity for molecular detection.
- Plasmonic nanostructures are crucial for enhancing SEIRA signals.
Purpose of the Study:
- To investigate the efficacy of gold strip gratings for SEIRA spectroscopy.
- To explore the tunability and enhancement capabilities of these gratings.
Main Methods:
- Fabrication of gold strip gratings using standard optical lithography.
- Excitation of surface plasmon polaritons at air-gold and gold-substrate interfaces.
- Measurement of SEIRA enhancement factors for PMMA molecules.
Main Results:
- Linear tunability of grating resonance with grating period.
- Achieved a SEIRA enhancement factor exceeding 6000 for PMMA.
- Demonstrated strong field enhancement at the edges of gold strips.
Conclusions:
- Gold strip gratings are a promising and easily fabricated platform for SEIRA experiments.
- The tunable resonance and high enhancement factor are key advantages.
- This method facilitates sensitive molecular detection.
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