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Titanium nitride as an alternative and reusable plasmonic substrate for fluorescence coupling.

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Titanium nitride (TiN) thin films show promise as reusable plasmonic materials for fluorescence coupling. These emerging materials offer performance comparable to gold for surface plasmon-coupled and waveguide-coupled emission applications.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Gold and silver are traditional plasmonic materials, but research into alternatives is ongoing.
  • Plasmonic materials enable enhanced light-matter interactions crucial for various optical applications.

Purpose of the Study:

  • To investigate titanium nitride (TiN) as an alternative plasmonic material.
  • To evaluate TiN's effectiveness for fluorescence coupling in metal-dielectric structures.
  • To compare TiN performance with conventional gold substrates for coupled emission.

Main Methods:

  • Preparation and characterization of TiN thin films.
  • Experimental measurements combined with reflectivity calculations.
  • Analysis of optical modes (surface plasmon and waveguide modes) in TiN-based metal-dielectric structures.

Main Results:

  • TiN thin films support surface plasmon and waveguide modes tunable by dielectric layer thickness.
  • Fluorophores coupled effectively with these modes, yielding polarized and directional emission.
  • TiN substrates demonstrated performance comparable to gold for surface plasmon-coupled emission (SPCE) and waveguide-coupled emission (WGCE).

Conclusions:

  • TiN is a viable and reusable alternative plasmonic material.
  • TiN-based structures are effective for SPCE and WGCE.
  • The reusability of TiN offers advantages for fluorescence sensing applications.