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A Simple Phase-Sensitive Surface Plasmon Resonance Sensor Based on Simultaneous Polarization Measurement Strategy.

Meng-Chi Li1,2, Kai-Ren Chen3, Chien-Cheng Kuo1,3

  • 1Thin Film Technology Center, National Central University, Taoyuan 320317, Taiwan.

Sensors (Basel, Switzerland)
|November 27, 2021
PubMed
Summary

This study introduces a novel phase-sensitive surface plasmon resonance (SPR) sensor for precise detection of chemical analytes. The new method simplifies phase shift measurement, enabling highly sensitive detection of glyphosate at low concentrations.

Keywords:
phase-sensitive SPRphase-shift interferometrypixelated micropolarizer array

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Area of Science:

  • Optics and Photonics
  • Chemical Sensing
  • Surface Plasmon Resonance (SPR)

Background:

  • Surface Plasmon Resonance (SPR) is a phenomenon sensitive to changes in refractive index.
  • Measuring the optical phase shift in SPR offers higher sensitivity than intensity changes.
  • Direct optical phase measurement is challenging due to high frequencies, requiring complex extraction techniques.

Purpose of the Study:

  • To develop a simple and effective method for measuring SPR phase shifts.
  • To create a phase-sensitive SPR sensor for detecting small molecules.
  • To demonstrate the sensor's capability in herbicide detection.

Main Methods:

  • Utilized phase-shift interferometry for SPR phase shift measurement.
  • Employed a pixelated polarization camera for simultaneous recording of polarization-dependent interference signals in a single snapshot.
  • Applied a phase extraction algorithm for effortless acquisition of phase information.

Main Results:

  • Successfully developed and applied a phase-sensitive SPR sensor.
  • Demonstrated effective detection of glyphosate, a widely used herbicide.
  • Achieved a low detection limit of 15 ng/mL (0.015 ppm) for glyphosate.

Conclusions:

  • The proposed phase-shift interferometry method provides a simple and effective strategy for SPR phase shift measurement.
  • The phase-sensitive SPR system offers high sensitivity for detecting small molecules.
  • This technique presents a prospective approach for acquiring phase signals in SPR sensing applications.