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Implementation of a Reference Interferometer for Nanodetection

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Asymmetric parameter enhancement in the split-ring cavity array for virus-like particle sensing.

Xiao Jin^1,2, Lu Xue^1,2, Shengwei Ye³

¹School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Biomedical Optics Express

|March 23, 2023

Summary

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This summary is machine-generated.

A new method uses polarization imaging and a gold-coated nanocavity array to detect low concentrations of virus-like particles. This technique achieves a detection limit of 56 vp/150µL, aiding early infection diagnosis and water analysis.

Area of Science:

* Nanophotonics
* Plasmonics
* Biosensing

Background:

* Accurate, low-concentration virus detection is crucial for early disease diagnosis and environmental monitoring.
* Existing methods often face challenges with sensitivity and background noise, limiting early detection capabilities.

Purpose of the Study:

* To develop a novel, highly sensitive method for quantitative detection of virus-like particles (VLPs).
* To enhance detection sensitivity and reduce noise for improved virus screening applications.

Main Methods:

* Employed indirect polarization parametric imaging combined with a plasmonic split-ring nanocavity array.
* Utilized a thin gold film to enhance asymmetry and a quantitative algorithm based on the extended Laplace operator.
* Analyzed far-field scattering patterns and spatial photon state distributions with sub-wavelength resolution.

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Main Results:

* Demonstrated that virus attachment to the nanocavity breaks structural symmetry, creating a detectable asymmetric plasmon mode.
* The extended Laplace operator effectively reduced background noise and amplified asymmetric signals.
* Achieved a low detection limit of 56 virus-like particles per 150µL (vp/150µL) over a large area.

Conclusions:

* The developed method offers a sensitive and quantitative approach for detecting low concentrations of VLPs.
* This technique shows significant potential for early virus screening and water quality analysis.
* The combination of plasmonic nanocavities and advanced imaging algorithms provides a robust biosensing platform.