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Related Experiment Video

Updated: Apr 20, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

Differentiating surface and bulk interactions in nanoplasmonic interferometric sensor arrays.

Beibei Zeng¹, Yongkang Gao, Filbert J Bartoli

¹Electrical and Computer Engineering Department, Lehigh University, Bethlehem, PA 18015, USA. bez210@lehigh.edu fjb205@lehigh.edu.

|November 20, 2014

Summary

This summary is machine-generated.

This study introduces a nanoplasmonic sensor that distinguishes surface-bound molecules from bulk solution changes. This breakthrough enables precise detection in complex samples for various sensing applications.

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Area of Science:

Nanotechnology
Biomedical Engineering
Analytical Chemistry

Background:

Distinguishing surface adsorption from bulk refractive index changes is critical in sensing.
Complex solutions in environmental, chemical, biological, and medical fields pose significant detection challenges.
Existing methods often struggle with differentiating these effects at a single sensing point.

Purpose of the Study:

To develop a nanoplasmonic interferometric sensor platform capable of differentiating surface effects from bulk refractive index changes.
To achieve this differentiation at a single sensing spot using a simplified sensor design.
To demonstrate the sensor's capability in detecting specific biomolecules against background interference.

Main Methods:

Utilizing a nanoplasmonic interferometric sensor with ring-hole structures.
Exploiting the differential penetration depths of multiple propagating surface plasmon polaritons.
Exciting surface plasmon polaritons in a collinear transmission geometry.

Main Results:

Successfully differentiated the adsorption of a thin bovine serum albumin (BSA) protein layer (1.91 nm effective thickness) from a 10(-3) refractive index unit bulk change.
Achieved real-time sensor output with a noise level comparable to traditional prism-based surface plasmon resonance sensors.
Demonstrated a significantly simpler sensor footprint and geometry.

Conclusions:

The nanoplasmonic interferometric sensor platform offers a robust solution for distinguishing surface binding events from bulk solution interferences.
The simplified design and miniaturized footprint make it suitable for diverse and complex sensing applications.
This technology provides a sensitive and specific method for analyte detection in multi-component systems.