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Plasmonic slanted slit gratings for efficient through-substrate light-plasmon coupling and sensing.

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We developed plasmonic slanted slit gratings (PSSGs) for efficient light-SPP coupling. Mirrored PSSG pairs show promise for sensitive, robust biosensing applications.

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Area of Science:

  • Photonics and Nanotechnology
  • Plasmonics
  • Optical Metamaterials

Background:

  • Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
  • Directional coupling of light to SPPs is crucial for integrated photonic devices.
  • Plasmonic gratings offer a route to control SPP excitation and propagation.

Purpose of the Study:

  • To experimentally study plasmonic slanted slit gratings (PSSGs) for directional light-SPP coupling.
  • To investigate mirrored PSSG pairs for potential sensing applications.
  • To evaluate the fabrication robustness and sensing potential of the PSSG design.

Main Methods:

  • Fabrication of PSSGs and mirrored PSSG pairs using gallium focused ion beam (FIB) milling.
  • Theoretical investigation of optical characteristics and sensing capabilities.
  • Experimental characterization of light coupling to SPPs and vice versa.

Main Results:

  • PSSGs enable efficient directional coupling between incident light and SPPs.
  • Mirrored PSSG pairs demonstrate effective SPP propagation and decoupling.
  • The PSSG configuration exhibits high sensitivity to refractive index changes, indicating sensing potential.
  • The design shows robustness to fabrication tolerances.

Conclusions:

  • PSSGs are a viable technology for directional light-SPP coupling.
  • Mirrored PSSG pairs offer a promising platform for integrated sensing devices.
  • The developed structures have potential for diverse applications in nanophotonics and sensing.