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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Mechanical modulation method for ultrasensitive phase measurements in photonics biosensing.

S Patskovsky¹, M Maisonneuve, M Meunier

¹Engineering Physics Department, Ecole Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7.

|December 24, 2008

Summary

A new polarimetry method enables highly sensitive, phase-based biological sensing. This technique offers simple setup and noise immunity for optical transduction applications.

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Area of Science:

Optical Physics
Biomedical Sensing
Metrology

Background:

Phase-sensitive measurements are crucial for high-resolution optical biosensing.
Existing methods often require complex setups or lack sufficient sensitivity.
Optical transduction offers label-free detection capabilities for biological analytes.

Purpose of the Study:

To introduce a novel polarimetry methodology for phase-sensitive measurements in a single reflection geometry.
To demonstrate its application in optical transduction-based biological sensing.
To evaluate its performance in Total Internal Reflection (TIR) and Surface Plasmon Resonance (SPR) configurations.

Main Methods:

Utilized chopper-based mechanical phase modulation for orthogonal s- and p-polarized light.

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Extracted phase information at different harmonics of the modulation frequency.

Investigated the methodology using both TIR and SPR geometries with varying prism materials.

Main Results:

Achieved phase measurement resolution as low as 0.007 degrees with a simple experimental setup.
Demonstrated a detection limit of 10⁻⁵ Refractive Index Unit (RIU) change for Si-based TIR.
Showcased a detection limit of 3.2*10⁻⁷ RIU for SPR, indicating superior phase response.

Conclusions:

The proposed polarimetry methodology offers high sensitivity and simplicity for optical biosensing.
It provides excellent noise immunity due to stable modulation.
The method is particularly effective in SPR configurations, achieving state-of-the-art sensitivity for phase-sensitive detection.