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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Phase shifts and interference in surface plasmon polariton waves
1IRSAMC/LCAR Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France. jweiner@ifsc.usp.br
Optics Express
|June 11, 2008
Summary
Surface Plasmon polariton (SPP) waves exhibit an intrinsic pi phase shift, independent of structure depth. This phase shift explains optical transmission minima in slit arrays due to destructive interference.
Area of Science:
- Optics
- Plasmonics
- Nanophotonics
Background:
- Subwavelength structures like slits and grooves are used to launch surface Plasmon polariton (SPP) waves.
- Observed optical transmission minima in slit arrays have been attributed to SPP waves.
Purpose of the Study:
- To investigate the phase shift of SPP waves launched from one-dimensional subwavelength structures.
- To explain the physical origin of the intrinsic pi phase shift and its role in optical transmission.
- To clarify the relationship between SPP wavelength and transmission minima in slit arrays.
Main Methods:
- Numerical simulations were employed to analyze the interaction between incident waves and SPP waves.
- The study focused on the contributions of magnetic field induction and oscillating dipoles to the phase shift.
- Theoretical analysis was performed to determine the phase shift's independence from structural parameters like groove depth.
Main Results:
- An intrinsic pi phase shift was identified for SPP waves launched from subwavelength slits or grooves.
- This phase shift is independent of the depth of the slit or groove.
- The results highlight the roles of magnetic field induction and oscillating dipoles in generating the pi phase shift.
Conclusions:
- The intrinsic pi phase shift is a fundamental property of SPP waves launched by these structures.
- Destructive interference between the pi-shifted SPP wave and the incident wave explains transmission minima in slit arrays.
- The findings provide a deeper understanding of light-SPP interactions and optical transmission phenomena in nanostructured materials.
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