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Plasmon-emitter interaction using integrated ring grating-nanoantenna structures.

Nancy Rahbany¹, Wei Geng, Renaud Bachelot

¹Laboratory of Nanotechnology, Instrumentation and Optics, ICD CNRS UMR 6281, University of Technology of Troyes, 10000, Troyes, France.

|March 22, 2017

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Novel plasmonic structures enhance optical resolution by coupling surface plasmon polaritons (SPPs) with localized surface plasmons (LSPs). This integration improves nanoscale focusing and boosts emitter fluorescence, overcoming diffraction limits in nanophotonics.

Area of Science:

Plasmonics
Nanooptics
Nanophotonics

Background:

Achieving high optical resolution below the diffraction limit is a key challenge.
Surface plasmon polaritons (SPPs) offer waveguiding but limited confinement.
Localized surface plasmons (LSPs) provide sub-wavelength confinement but high losses.

Purpose of the Study:

To introduce novel plasmonic structures integrating nanoantennas with ring diffraction gratings.
To investigate the coupling of SPPs and LSPs for enhanced nanoscale focusing.
To study the impact of these structures on emitter photoluminescence and radiative decay.

Main Methods:

Finite-difference time-domain (FDTD) simulations.
Experimental fabrication of plasmonic structures (nanoprisms, bowtie nanoantennas).

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Optical characterization of plasmon-emitter coupling with dye molecules.

Main Results:

Demonstrated efficient coupling between SPPs and LSPs in the integrated structures.
Achieved enhanced nanoscale focusing due to SPP-LSP coupling.
Observed significant increase in fluorescence emission and radiative decay enhancement of emitters.

Conclusions:

The novel integrated plasmonic structures effectively overcome diffraction limits.
SPP-LSP coupling enables precise nanoscale focusing and enhanced light-matter interaction.
These structures hold potential for advanced applications in nanophotonics and sensing.