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Liquid-Metal-Based Nanophotonic Structures for High-Performance SEIRA Sensing
Xianglong Miao1, Ting Shan Luk2, Peter Q Liu1
1Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA.
Advanced Materials (Deerfield Beach, Fla.)
|January 6, 2022
Summary
This study introduces novel nanopatch antenna sensors with a liquid gallium ground plane for highly sensitive surface-enhanced infrared absorption (SEIRA) spectroscopy. These sensors enable efficient analyte delivery to nanometric hot spots for advanced chemical detection.
Area of Science:
- Nanophotonics
- Spectroscopy
- Materials Science
Background:
- Surface-enhanced infrared absorption (SEIRA) spectroscopy offers label-free, sensitive analyte detection.
- Existing SEIRA sensors face challenges in delivering analytes to nanoscale hot spots for enhanced detection.
- Nanophotonic resonant structures are crucial for amplifying electric fields and light-matter interactions.
Purpose of the Study:
- To develop high-performance nanophotonic SEIRA sensors.
- To overcome the challenge of analyte delivery into nanometric hot spots.
- To enable convenient and efficient sensing for point-of-care applications.
Main Methods:
- Utilized nanopatch antennas with a liquid gallium ground plane for SEIRA sensing.
- Integrated liquid metal into nanophotonic structures for enhanced field confinement.
- Developed a simple procedure for analyte delivery suitable for practical applications.
Main Results:
- Achieved ultrahigh electric field confinement and enhancement using the novel sensor design.
- Demonstrated convenient and efficient analyte delivery into nanometric hot spots.
- Obtained significant molecular vibrational signals (~10%) near 2900 cm⁻¹ from monolayer 1-octadecanethiol.
Conclusions:
- The liquid-metal-based nanophotonic SEIRA sensors offer superior sensitivity in the mid-infrared region.
- This cost-effective approach provides a new strategy for developing high-performance infrared sensors.
- The technology is suitable for point-of-care applications and other photonics applications.
