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Engineering Antiviral Agents via Surface Plasmon Resonance
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Far- and Deep-Ultraviolet Surface Plasmon Resonance Sensor.

Ichiro Tanabe1, Yoshito Y Tanaka2

  • 1Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 5608531, Japan.

Chemical Record (New York, N.Y.)
|September 27, 2018
PubMed
Summary

Aluminum (Al) films exhibit surface plasmon resonance (SPR) in the UV region, enabling sensitive refractive index sensing. This study optimizes Al-SPR for enhanced selectivity and extends plasmonics to shorter wavelengths below 200 nm.

Keywords:
AbsorptionSensorsSurface analysisSurface plasmon resonanceUV/Vis spectroscopy

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Area of Science:

  • Ultraviolet (UV) plasmonics
  • Nanophotonics
  • Materials science

Background:

  • Plasmonics research increasingly focuses on the UV region due to higher energy and electronic resonances.
  • Conventional visible plasmonics offer limited sensitivity, material, and surface selectivity.
  • Aluminum (Al) is a promising material for UV plasmonic applications.

Purpose of the Study:

  • To investigate the surface plasmon resonance (SPR) properties of Al films for refractive index sensing applications.
  • To leverage UV light for enhanced sensitivity, material selectivity, and surface selectivity in sensing.
  • To extend plasmonic studies into higher energy regions below 200 nm.

Main Methods:

  • Utilized an original attenuated total reflectance spectroscopic instrument to study Al-SPR.
  • Investigated Al-SPR angle and wavelength by altering environmental conditions on the Al film.
  • Analyzed the influence of Al film thickness and prism substrate materials on SPR properties.

Main Results:

  • Optimized Al films demonstrated effective sensing capabilities in both air and liquid environments.
  • Al-SPR properties were found to be significantly dependent on film thickness and prism material.
  • The developed system successfully extended plasmonics to wavelengths below 200 nm.

Conclusions:

  • Al films are suitable for UV-based refractive index sensing with high sensitivity and selectivity.
  • Optimization of film thickness and substrate is crucial for effective Al-SPR sensor performance.
  • This work pushes the boundaries of plasmonics into the higher energy UV spectrum (< 200 nm).