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Updated: Jun 26, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Refractive index sensor based on surface-plasmon interference.

Xiaofei Wu¹, Jiasen Zhang, Jianjun Chen

¹State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing, China.

|February 3, 2009

Summary

This summary is machine-generated.

We developed a novel refractive index sensor using gold film interference. This sensor shows a highly sensitive and linear response to changes in refractive index, crucial for various applications.

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

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Published on: July 21, 2018

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Last Updated: Jun 26, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

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

Area of Science:

Optoelectronics
Nanotechnology
Chemical Sensing

Background:

Surface Plasmon Resonance (SPR) sensors are vital for detecting changes in refractive index.
Existing SPR sensors face challenges in sensitivity and linearity for certain applications.

Purpose of the Study:

To propose and demonstrate a novel refractive index sensor based on the interference of two surface-plasmon waves.
To investigate the sensor's performance with varying concentrations of NaCl-H2O solutions.

Main Methods:

Fabrication of a gold film with a two-slit structure to support dual surface-plasmon wave interference.
Theoretical analysis of the interference phase and consideration of the gold dielectric function's dispersion relation.
Experimental testing using NaCl-H2O solutions to evaluate sensor response.

Main Results:

The sensor exhibited a linear response to changes in refractive index across tested concentrations.
Achieved a high sensitivity of 4547 nm/RIU (refractive index unit) for refractive index detection.
The interference phenomenon of surface-plasmon waves was effectively utilized for sensing.

Conclusions:

The proposed two-slit gold film sensor offers a promising platform for high-sensitivity refractive index sensing.
The sensor's linear response and high sensitivity make it suitable for applications requiring precise concentration monitoring.
This work contributes to the advancement of optical sensing technologies through plasmonic interference.