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A Self-Referenced Refractive Index Sensor Based on Gold Nanoislands.

Carlos Angulo Barrios1, Teona Mirea2, Miguel Huerga Represa1

  • 1Department of Photonics and Bioengineering, CEMDATIC, ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.

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Summary

This study introduces a self-referenced optical sensor using gold nanoislands on a Fabry-Pérot cavity. The sensor offers high sensitivity to refractive index changes for advanced biosensing applications.

Keywords:
localized surface plasmonmetal nanoparticleoptical sensorrefractive index

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Area of Science:

  • Plasmonics
  • Optical Sensing
  • Nanotechnology

Background:

  • Localized surface plasmon resonance (LSPR) is sensitive to surrounding refractive index changes.
  • Fabry-Pérot cavities offer stable optical resonances.
  • Combining LSPR with optical cavities can enhance sensor performance.

Purpose of the Study:

  • To develop a self-referenced refractive index optical sensor.
  • To leverage the combined resonances of gold nanoislands and a Fabry-Pérot cavity.
  • To achieve high sensitivity and stability for biosensing.

Main Methods:

  • Fabrication of a planar SiO2/metal Fabry-Pérot cavity with dewetted gold nanoislands.
  • Experimental and theoretical analysis of the device's reflectance spectrum.
  • Testing the sensor's response to variations in surrounding fluid refractive index.

Main Results:

  • The spectral response is a combination of LSPR and Fabry-Pérot cavity resonances.
  • The LSPR provides high sensitivity to refractive index changes, while the cavity resonance acts as a reference.
  • Achieved spectral sensitivity of 212 nm/RIU and intensity sensitivity of 4.9 RIU^-1.

Conclusions:

  • The proposed self-referenced sensor architecture is effective for refractive index sensing.
  • The combination of LSPR and Fabry-Pérot resonances enables stable and sensitive measurements.
  • The chip-based, low-cost design is promising for compact reflection-mode biosensing platforms.