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Surface Plasmon Resonance Sensors Using Optical Vortices.

George A Bulzan1,2, Daniela Dragoman1,3

  • 1Physics Faculty, University of Bucharest, P.O. Box MG-11, 077125 Bucharest-Magurele, Romania.

Nanomaterials (Basel, Switzerland)
|June 25, 2025
PubMed
Summary
This summary is machine-generated.

Using optical vortices in Surface Plasmon Resonance (SPR) sensors shows minimal impact on detection performance. However, these vortices offer advantages for positioning and manipulating analyte molecules on the sensor surface.

Keywords:
optical vorticessensorssurface plasmon polaritons

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Surface Plasmon Resonance (SPR) sensors are crucial for label-free biomolecular detection.
  • Traditional SPR sensors utilize plane waves for illumination.
  • Investigating alternative illumination sources like optical vortices is essential for enhancing SPR sensor capabilities.

Purpose of the Study:

  • To analyze the effect of optical vortices on SPR sensor performance in the Kretschmann configuration.
  • To determine if optical vortices impact the angular position and width of the SPR reflectance minimum.
  • To explore the potential benefits of optical vortices for analyte manipulation in SPR sensing.

Main Methods:

  • Derivation of an analytical expression for reflectance using Laguerre-Gaussian beams (optical vortices).
  • Application of first-order approximation of Fresnel reflection coefficient in a Taylor series expansion.
  • Conducting numerical simulations to evaluate SPR sensor performance with optical vortex illumination.

Main Results:

  • SPR sensor detection performance remains largely unaffected by optical vortex illumination, even with high topological charges.
  • The angular position and width of the SPR reflectance minimum show minimal changes when using optical vortices.
  • Optical vortices demonstrate potential for precise positioning and manipulation of analyte molecules on the sensor surface.

Conclusions:

  • Optical vortices can be employed as illumination sources in SPR sensors without compromising detection sensitivity.
  • The primary advantage of using optical vortices lies in their capability for surface-based analyte manipulation.
  • This research opens avenues for advanced SPR sensor designs with integrated molecular handling functionalities.