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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Optical force sensor based on plasmon modulated upconversion luminescence.

Conrad Corbella Bagot1, Taleb Ba Tis2, Bo Xu3

  • 1Department of Electrical, Computer and Energy Engineering, University of Colorado, Boulder, CO 80309-0425, U.S.A.

Advanced Optical Materials
|September 23, 2024
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Summary

This study introduces a new force sensor using plasmonic nanostructures and upconversion nanoparticles (UCNPs). The sensor offers highly responsive and robust force detection for diverse applications.

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Upconversion luminescenceforce sensingplasmon

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • Upconversion nanoparticles (UCNPs) offer unique optical properties for sensing applications.
  • Plasmonic nanostructures can enhance light-matter interactions.
  • Developing robust and sensitive force sensors is crucial for various scientific and technological fields.

Purpose of the Study:

  • To develop a novel force sensor based on the interaction between plasmonic nanostructures and UCNPs.
  • To achieve high responsivity and robustness against environmental variations in force sensing.
  • To explore the potential of this nanosensor for applications in biology and robotics.

Main Methods:

  • Fabrication of a nanosensor comprising a gold nanodisk and UCNPs separated by a polymer layer.
  • Utilizing the plasmon resonance of the gold nanodisk to selectively enhance UCNP emission.
  • Modulating plasmon-UCNP coupling by altering polymer layer thickness under external force.
  • Implementing ratiometric sensing for enhanced robustness.

Main Results:

  • The nanosensor demonstrates force sensitivity through changes in luminescence intensity.
  • Ratiometric sensing ensures robustness against environmental fluctuations.
  • Achieved two orders of magnitude higher responsivity compared to previous UCNP-based force sensors.
  • Nanosensors can be prepared as on-chip arrays or colloidal solutions.

Conclusions:

  • The developed plasmon-UCNP force sensor is highly sensitive and robust.
  • This technology shows significant improvement over existing UCNP-based force sensors.
  • The versatility in preparation methods makes it suitable for broad applications in biology and robotics.