A simple phase‐sensitive surface plasmon resonance sensor based on simultaneous polarization measurement strategy

Meng Chi Li, Kai Ren Chen, Chien Cheng Kuo, Yu Xen Lin, Li Chen Su

Research output: Contribution to journalArticlepeer-review

Abstract

The SPR phenomenon results in an abrupt change in the optical phase such that one can measure the phase shift of the reflected light as a sensing parameter. Moreover, many studies have demonstrated that the phase changes more acutely than the intensity, leading to a higher sensitivity to the refractive index change. However, currently, the optical phase cannot be measured directly because of its high frequency; therefore, investigators usually have to use complicated techniques for the extraction of phase information. In this study, we propose a simple and effective strategy for measuring the SPR phase shift based on phase‐shift interferometry. In this system, the polarization-dependent interference signals are recorded simultaneously by a pixelated polarization camera in a single snapshot. Subsequently, the phase information can be effortlessly acquired by a phase extraction algorithm. Experimentally, the proposed phase‐sensitive SPR sensor was successfully ap-plied for the detection of small molecules of glyphosate, which is the most frequently used herbicide worldwide. Additionally, the sensor exhibited a detection limit of 15 ng/mL (0.015 ppm). Regarding its simplicity and effectiveness, we believe that our phase‐sensitive SPR system presents a prospec-tive method for acquiring phase signals.

Original languageEnglish
Article number7615
JournalSensors (Switzerland)
Volume21
Issue number22
DOIs
StatePublished - 1 Nov 2021

Keywords

  • Phase‐sensitive SPR
  • Phase‐shift interferometry
  • Pixelated micropolarizer array

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