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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Alternative Plasmonic Materials for Fluorescence Enhancement.

Stavros Athanasiou1, Olivier J F Martin1

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Summary
This summary is machine-generated.

Doped semiconductors offer alternative plasmonic materials but show weaker fluorescence enhancement than noble metals due to absorption. However, reasonable enhancement is achievable for infrared dyes in specific environments.

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Area of Science:

  • Plasmonics
  • Materials Science
  • Quantum Optics

Background:

  • Noble metals (gold, silver) are established plasmonic materials for fluorescence enhancement.
  • Doped semiconductors are emerging as alternative plasmonic materials with tunable resonances.

Purpose of the Study:

  • To investigate the suitability of doped semiconductors for enhancing molecular fluorescence.
  • To compare their performance against traditional plasmonic metals.

Main Methods:

  • Studied nanosized semiconductor spheres under plane wave illumination.
  • Calculated fluorescence enhancement factors coupled to quantum emitters.
  • Compared semiconductor performance with gold and silver nanoparticles.

Main Results:

  • Semiconductors exhibit significantly reduced fluorescence enhancement due to dominant absorption.
  • Quenched emission was observed, hindering enhancement capabilities.
  • Enhancement is possible for poorly emitting dyes and in high refractive index environments.

Conclusions:

  • Doped semiconductors provide weaker fluorescence enhancement compared to noble metals.
  • Strategies exist to compensate for absorption losses.
  • Viable fluorescence enhancement can be achieved for infrared dyes.