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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

Grating-coupled surface plasmon resonance in conical mounting with polarization modulation.

G Ruffato¹, F Romanato

¹Department of Physics G. Galilei, Padova University, Via Marzolo 8, Padova 35131, Italy. gianluca.ruffato@venetonanotech.it

|June 30, 2012

Summary

This study introduces a novel grating-coupled surface plasmon resonance (GCSPR) sensor. The technique enhances sensitivity by rotating a metallic grating, enabling compact and high-resolution plasmonic sensing.

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Area of Science:

Plasmonics
Nanotechnology
Optical Sensing

Background:

Surface plasmon resonance (SPR) is a powerful label-free sensing technique.
Conventional SPR sensors face limitations in sensitivity and miniaturization.
Grating-based SPR (GSPR) offers enhanced light-matter interaction.

Purpose of the Study:

To present a novel grating-coupled surface plasmon resonance (GCSPR) technique.
To enhance the sensitivity of plasmonic sensors through double-surface plasmon polariton excitation.
To develop a compact, fast, and high-resolution plasmonic sensing platform.

Main Methods:

Utilizing polarization modulation in a conical mounting configuration.
Employing azimuthal rotation of a metallic grating to excite double-surface plasmon polaritons.

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Performing polarization scans and analyzing reflectivity changes upon functionalization with a self-assembled monolayer.

Main Results:

Demonstrated harmonic dependence of the output signal on polarization.
Identified the phase term as a key parameter for sensing applications.
Achieved enhanced sensitivity due to double-SPR excitation.

Conclusions:

The presented GCSPR technique enables highly sensitive plasmonic sensing.
The method allows for the design of extremely compact, fast, and cost-effective sensors.
This approach holds significant potential for advanced biosensing and chemical detection applications.