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Using Metal-Multilayer-Dielectric Structure to Increase Sensitivity of Surface Plasmon Resonance Sensor.

Svitlana G Ilchenko1, Ruslan A Lymarenko2, Victor B Taranenko2

  • 1International Center "Institute of Applied Optics", National Academy of Science of Ukraine, 10G Kudryavska street, Kyiv, 04053, Ukraine. svitlana-ilchenko@ukr.net.

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A novel metal-multilayer-dielectric structure boosts evanescent field strength, enhancing surface plasmon resonance sensor sensitivity. This design improves waveguide transverse electric modes for better sensing performance.

Keywords:
Multilayer metal-dielectric structureSensitivity of sensorSurface plasmon resonance

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Sensor Technology

Background:

  • Surface Plasmon Resonance (SPR) sensors are crucial for label-free biosensing.
  • Enhancing the evanescent field is key to improving SPR sensor sensitivity.
  • Existing SPR structures face limitations in maximizing evanescent field strength.

Purpose of the Study:

  • To introduce a novel metal-multilayer-dielectric structure for SPR sensors.
  • To investigate the enhancement of the evanescent field using this structure.
  • To improve the sensitivity of SPR sensors through optimized mode support.

Main Methods:

  • Numerical simulations were employed to analyze the proposed structure.
  • The structure was designed on a glass substrate with metal-multilayer-dielectric layers.
  • Supported optical modes (hybrid plasmonic TM and waveguide TE) were investigated.

Main Results:

  • The proposed structure significantly enhances the evanescent field.
  • Improved sensor sensitivity was demonstrated, particularly for waveguide transverse electric modes.
  • The structure supports both hybrid plasmonic transverse magnetic and waveguide transverse electric modes.

Conclusions:

  • The designed metal-multilayer-dielectric structure offers a promising approach for advanced SPR sensors.
  • Significant evanescent field enhancement and sensitivity improvements are achievable.
  • The findings pave the way for more sensitive and efficient optical sensing platforms.