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Deep ultraviolet tip-enhanced fluorescence.

Lingyan Meng1, Man Gao1, Mengtao Sun2

  • 1School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, People's Republic of China.

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|November 13, 2018
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Summary
This summary is machine-generated.

This study explores deep ultraviolet tip-enhanced fluorescence (DUV-TEF) using novel core-shell tips. Calculations show DUV-TEF can achieve high sensitivity and resolution, expanding fluorescence microscopy into the UV range.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Spectroscopy and Microscopy
  • Materials Science

Background:

  • Tip-enhanced fluorescence (TEF) is a powerful nanoscale imaging technique.
  • Extending TEF to the deep ultraviolet (DUV) range offers new possibilities for high-resolution spectroscopy.
  • Understanding the physical mechanisms governing DUV-TEF is crucial for technological advancement.

Purpose of the Study:

  • To theoretically investigate deep ultraviolet tip-enhanced fluorescence (DUV-TEF).
  • To quantitatively analyze fluorescence enhancement, spatial resolution, and surface plasmon coupled emission (SPCE) in DUV-TEF.
  • To explore the potential of Al@Al2O3 core-shell tips for DUV-TEF applications.

Main Methods:

  • Utilized theoretical calculations employing the finite-difference time-domain (FDTD) method.
  • Simulated DUV-TEF using Al@Al2O3 core-shell tips.
  • Analyzed enhancement factor (EF), spatial resolution, and SPCE angles at DUV excitation wavelengths.

Main Results:

  • Achieved a fluorescence enhancement factor (EF) up to 3 orders of magnitude in optimal geometries.
  • Demonstrated a spatial resolution of 6 nm at a 244 nm excitation wavelength.
  • Observed maximum EF of 7.4 × 10^2 with SPCE angles of ±23°.

Conclusions:

  • The study provides insights into the physical mechanisms of DUV-TEF.
  • Results support the development of high-sensitivity and high-resolution DUV-TEF platforms.
  • This work contributes to extending TEF technology from visible to the UV spectral range.