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Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas

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Advanced DNA Detection via Multispectral Plasmonic Metasurfaces.

Valentina Di Meo¹, Massimo Moccia², Gennaro Sanità^1,3

¹Institute of Applied Sciences and Intelligent Systems Unit of Naples, National Research Council, Naples, Italy.

Frontiers in Bioengineering and Biotechnology

|May 31, 2021

Summary

This study introduces a plasmonic metasurface sensor for detecting deoxyribonucleic acid (DNA) at ultra-low concentrations. The novel platform offers highly sensitive, label-free DNA fragment detection.

Keywords:

DNA biosensor localized surface plasmon resonances multiwavelength detection plasmonic metasurface surface enhanced infrared absorption spectroscopy

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Area of Science:

Nanotechnology
Spectroscopy
Biochemistry

Background:

Detection of low concentrations of DNA fragments is crucial for diagnostics.
Existing methods often lack sensitivity, speed, or simplicity.
Plasmonic metasurfaces offer potential for enhanced sensing capabilities.

Purpose of the Study:

To develop and demonstrate a plasmonic metasurface-based sensing platform.
To achieve highly sensitive and label-free detection of DNA fragments.
To validate the platform's performance at femtomolar concentrations.

Main Methods:

Utilized surface-enhanced infrared absorption (SEIRA) spectroscopy.
Engineered a multispectral metasurface covering the mid-infrared range.
Bio-functionalized the metasurface with peptide nucleic acid (PNA) for specific DNA recognition.

Main Results:

Demonstrated detection of complementary DNA fragments at concentrations as low as 50 fM.
Achieved univocal and label-free molecular recognition.
Validated the platform using a gold metasurface on a silicon chip.

Conclusions:

The proposed plasmonic metasurface platform enables ultra-sensitive DNA detection.
Offers advantages over standard methods in terms of sensitivity, speed, and ease of use.
Highlights the potential of metasurface-based SEIRA for molecular diagnostics.