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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Gap surface plasmon polaritons enhanced by a plasmonic lens.
1Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843-3128, USA.
Optics Letters
|August 18, 2011
Summary
This study explores optical field enhancement using gap surface plasmon polaritons (GSPPs) and propagating surface plasmon polaritons (SPPs). The combined effect achieves extreme field confinement, boosting surface-enhanced Raman scattering (SERS) by up to 10^15.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Engineering
Background:
- Surface plasmon polaritons (SPPs) are crucial for manipulating light at the nanoscale.
- Gap surface plasmon polaritons (GSPPs) offer enhanced light confinement in nanogaps.
- Plasmonic lenses can launch propagating surface waves.
Purpose of the Study:
- To numerically investigate optical field enhancement using GSPPs and propagating SPPs.
- To explore the synergistic effects of GSPPs and plasmonic lens-launched SPPs.
- To assess the potential for achieving ultra-high surface-enhanced Raman scattering (SERS) enhancement factors.
Main Methods:
- Numerical investigation of optical field enhancement.
- Utilizing gap surface plasmon polaritons (GSPPs) and propagating surface plasmon polaritons (SPPs).
- Employing a circular slit at a metal-dielectric interface to launch surface waves.
Main Results:
- Optical field enhancement is achieved through GSPP scattering and coupling, and by SPPs launched by a circular plasmonic lens.
- The combination of GSPPs and plasmonic lens-launched SPPs leads to extremely strong field confinement.
- A surface-enhanced Raman scattering (SERS) enhancement factor of up to 10^15 was observed at the tip of equilateral triangular nanostructures.
Conclusions:
- The proposed structure effectively combines GSPPs and propagating SPPs for significant optical field enhancement.
- Ultra-high SERS enhancement factors are achievable, indicating potential for advanced sensing applications.
- This approach holds promise for applications requiring strong optical field confinement, such as SERS-based optical sensing.
