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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions

A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions

Published on: November 23, 2015

Plasmonic interferometers for label-free multiplexed sensing.

Yongkang Gao¹, Zheming Xin, Qiaoqiang Gan

¹Electrical and Computer Engineering Department, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

|March 14, 2013

Summary

This summary is machine-generated.

This study introduces a novel plasmonic interferometric biosensor for sensitive biomolecular detection. The miniaturized device offers high resolution and potential for real-time, label-free multiplexed sensing applications.

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Area of Science:

Nanophotonics and Plasmonics
Biosensing Technology
Optical Interferometry

Background:

Surface plasmon polaritons (SPPs) are electromagnetic waves confined to the interface between a metal and a dielectric.
Plasmonic nanostructures offer unique optical properties for sensing applications.
Interferometric techniques provide high sensitivity for detecting small changes in refractive index.

Purpose of the Study:

To develop a plasmonic interferometric biosensor using a slit-groove metallic nanostructure.
To monitor phase changes of SPPs due to biomolecular adsorption.
To achieve high sensitivity and resolution in a miniaturized sensing area.

Main Methods:

Fabrication of a slit-groove metallic nanostructure for SPP excitation.
Utilizing a collinear transmission setup with a compact spectrometer for measurements.
Experimental determination of sensing peak linewidth and refractive index resolution.
Development of a high-density sensor array for multiplexed sensing.
Implementation of a self-referencing method for enhanced sensitivity and noise reduction.

Main Results:

Achieved narrow sensing peak linewidths of 7 nm.
Demonstrated a refractive index resolution of 1 × 10(-5) RIU.
Successfully fabricated a miniaturized sensing area (10 × 30 µm(2)).
Showcased potential for real-time multiplexed sensing using a CCD camera.
Validated the effectiveness of the self-referencing method for multiplexing.

Conclusions:

The plasmonic interferometric biosensor offers enhanced sensing performance.
The small sensor footprint and simple instrumentation are advantageous.
The platform shows promise for integration into low-cost, label-free biosensing devices.
High multiplexing capabilities are achievable with the developed sensor array.