Surface plasmon polariton compression through radially and linearly polarized source

Area of Science:

• Plasmonics
• Nanophotonics
• Electromagnetism

Background:

• Surface plasmon polaritons (SPPs) are crucial for nanoscale light manipulation.
• Controlling SPP propagation, especially compression, is key for advanced optical devices.
• Metallic nanostructures offer unique platforms for plasmonic phenomena.

Purpose of the Study:

• To investigate the generation of a radial mode on metallic conical structures.
• To utilize this radial mode for observing adiabatic compression of SPPs.
• To elucidate the conditions required for radial mode generation and SPP compression.

Main Methods:

• Utilizing a linearly polarized incident wave on a metallic conical structure.
• Analyzing the phase-matching conditions of electromagnetic field components for radial mode generation.
• Simulating or experimentally characterizing the behavior of SPPs on tapered conical nanostructures.

Main Results:

• Successfully demonstrated the possibility of realizing a radial mode on metallic conical structures.
• Observed adiabatic compression of surface plasmon polaritons on tapered conical nanostructures.
• Identified key parameters for radial mode generation through electromagnetic field analysis.

Conclusions:

• The presented approach robustly enables radial mode generation and SPP adiabatic compression.
• The polaritonic behavior is controllable by adjusting the device geometry.
• This work provides a pathway for designing novel plasmonic devices for light manipulation.