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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.

Keywords:

liquid gallium liquid metals nanophotonics sensors surface-enhanced infrared absorption

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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.