Leaky wave lenses for spoof plasmon collimation.

Area of Science:

• Electromagnetism
• Surface Physics
• Metamaterials

Background:

• Spoof plasmons are surface waves confined to metallic surfaces with periodic corrugations.
• Controlling the propagation and radiation of spoof plasmons is crucial for advanced electromagnetic applications.

Purpose of the Study:

• To theoretically demonstrate a method for collimating radiating spoof plasmons.
• To introduce a leaky wave lens approach for focusing spoof plasmon energy.

Main Methods:

• Utilizing a leaky wave lens approach with a corrugated reactance surface.
• Introducing periodic perturbations to convert spoof plasmons into leaky wave modes.
• Engineering a non-uniform, sinusoidally modulated reactance profile to control wavenumber and radiation properties.

Main Results:

• Demonstrated the conversion of spoof plasmons into free-space radiating leaky waves.
• Achieved local control over the amplitude and phase of radiation by engineering the surface.
• Showcased the ability to create a converging wavefront that collimates spoof plasmon energy at a focal point.

Conclusions:

• The leaky wave lens approach is a feasible method for collimating spoof plasmons.
• Structural modification of corrugated surfaces allows for precise control over spoof plasmon radiation.
• This technique offers a pathway for efficient manipulation and focusing of electromagnetic energy.