Diffraction control of subwavelength structured light beams in Kapitza media

Area of Science:

• Optics and Photonics
• Metamaterials
• Wave Propagation

Background:

• Kapitza tandem structures, with alternating dielectric permittivity layers, were predicted to arrest microwave diffraction.
• The Kapitza effect offers potential for controlling wave propagation through engineered material properties.

Purpose of the Study:

• To investigate the applicability of the Kapitza effect for controlling structured subwavelength light beams.
• To explore diffraction cancellation and beam steering using Kapitza tandem structures.

Main Methods:

• Theoretical analysis of light propagation in Kapitza tandem structures.
• Numerical simulations of structured subwavelength beams interacting with modulated dielectric permittivity.

Main Results:

• Deep permittivity modulation enables nearly complete diffraction cancellation for multiple-peak subwavelength beams.
• Diffraction cancellation effectiveness decreases with a broader spatial spectrum of the input beam.
• Subwavelength light beams can be steered by adjusting the depth of permittivity modulation.

Conclusions:

• Kapitza tandem structures are effective for controlling subwavelength light beam propagation and diffraction.
• The Kapitza effect provides a mechanism for steering light beams by engineering material properties.