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Updated: Jun 4, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

White-light spectral interferometry for surface plasmon resonance sensing applications.

Siu Pang Ng¹, Chi Man Lawrence Wu, Shu Yuen Wu

¹Department of Physics and Materials Science, City University of Hong Kong, Hong Kong.

|March 4, 2011

Summary

A new surface plasmon resonance (SPR) sensor uses white-light interferometry for enhanced sensitivity and a wider dynamic range. This novel approach improves upon laser-based methods for practical sensing applications.

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Area of Science:

Optics and Photonics
Analytical Chemistry
Biomedical Engineering

Background:

Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
Existing laser-based SPR sensors face limitations in dynamic range and sensitivity.
Phase detection in SPR offers high sensitivity but requires complex setups.

Purpose of the Study:

To present a novel differential phase detecting SPR sensor.
To utilize white-light spectral interferometry for SPR excitation and phase measurement.
To enhance sensitivity and expand the dynamic range of SPR measurements.

Main Methods:

Employing a white-light source for SPR excitation.
Measuring SPR phase changes at an optimized coupling wavelength.

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Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations

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Published on: June 23, 2022

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Last Updated: Jun 4, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations

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Utilizing a fixed angle of incidence across the visible spectrum.

Main Results:

Achieved a detection limit of 2.6×10⁻⁷ Refractive Index Unit (RIU).
Demonstrated a refractive index measurement range of 10⁻² RIU.
Showcased optimal sensitivity and extended dynamic range compared to laser-based schemes.

Conclusions:

The proposed white-light SPR sensor offers superior performance over existing laser-based methods.
The enhanced dynamic range makes the system highly suitable for practical SPR sensing applications.
This novel approach provides a robust platform for sensitive and wide-range refractive index detection.