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Phase sensitive sensor on plasmonic nanograting structures.

M Maisonneuve¹, O d'Allivy Kelly, A-P Blanchard-Dionne

¹Department of engineering physics, École Polytechnique de Montreal, Montréal, Québec, Canada.

|January 26, 2012

Summary

This study introduces a novel phase-sensitive sensor using plasmonic nanogratings for precise refractive index detection. The technique offers a highly sensitive and efficient alternative for nanoplasmonic sensing applications.

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Area of Science:

Plasmonics and Nanophotonics
Optical Sensing Technologies

Background:

Conventional nanoplasmonic sensors often rely on spectral interrogation, which can be complex and less efficient.
Phase-sensitive detection offers potential for enhanced sensitivity and resolution in optical measurements.

Purpose of the Study:

To present a novel phase-sensitive sensor concept utilizing plasmonic nanograting structures.
To enable high-resolution polarimetric measurements for refractive index sensing.
To offer a more efficient alternative to existing nanoplasmonic sensing methods.

Main Methods:

Theoretical modeling was performed to optimize nanostructure geometry for polarimetric measurements.
The sensor utilizes normal incidence and transmission detection.
The optical setup achieves a high phase resolution of 6*10(-3) degrees.

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Main Results:

The developed nanostructures enable precise measurement of the phase difference between s- and p-polarized light.
The sensor achieves a high sensitivity of 3.8*10(-6) refractive index units (RIU) for bulk refractive index detection.
The phase-sensitive approach demonstrates superior performance compared to spectral interrogation methods.

Conclusions:

The proposed phase-sensitive plasmonic nanograting sensor provides a highly efficient and sensitive method for refractive index sensing.
This technique is a viable alternative to conventional spectral interrogation methods in nanoplasmonics.
The sensor has potential applications in multisensing and advanced imaging technologies.