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Related Experiment Video

Updated: Jul 25, 2025

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The Sensitivity of a Hexagonal Au Nanohole Array under Different Incident Angles.

Kang Yang1, Meiying Li1

  • 1School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China.

Biosensors
|June 27, 2023
PubMed
Summary

Increasing the incident angle of light significantly enhances surface plasmon resonance (SPR) sensor sensitivity. This method offers a simple yet effective way to boost performance for SPR biosensors without altering sensor structure.

Keywords:
Au nanohole arrayincident anglesensitivitysensorsurface plasmon resonance

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Area of Science:

  • Nanophotonics
  • Biosensing
  • Surface Plasmon Resonance (SPR)

Background:

  • Surface plasmon resonance sensors offer label-free, real-time detection of biochemical species.
  • Sensitivity is crucial for SPR sensors, typically improved by altering sensor size and morphology.
  • Modifying sensor structure is often tedious and limits practical applications.

Purpose of the Study:

  • To investigate the effect of incident light angle on SPR sensor sensitivity.
  • To analyze sensitivity changes in hexagonal gold nanohole array sensors.
  • To determine optimal incident angles for enhanced bulk and surface sensitivity.

Main Methods:

  • Theoretical investigation of a hexagonal Au nanohole array sensor (630 nm period, 320 nm hole diameter).
  • Analysis of reflectance spectra peak shifts due to refractive index changes.
  • Calculation of bulk sensitivity and surface sensitivity at varying incident angles (0° to 50°).

Main Results:

  • Increasing incident angle from 0° to 40° improved bulk sensitivity by 80% and surface sensitivity by 150%.
  • Sensitivities remained stable as the incident angle increased from 40° to 50°.
  • Incident angle is a critical parameter for optimizing SPR sensor performance.

Conclusions:

  • Incident angle adjustment offers a facile method to enhance SPR sensor sensitivity.
  • This approach avoids complex structural modifications, broadening sensor applications.
  • Findings provide insights for developing advanced SPR-based sensing technologies.