Dark superabsorbers with a needle-like radiation.

Area of Science:

• Nanophotonics
• Metamaterials
• Optical Engineering

Background:

• Subwavelength scatterers typically follow single-channel limits for scattering and absorption.
• Overlapping resonant modes usually increase scattering cross sections.

Purpose of the Study:

• To demonstrate a subwavelength cylinder that achieves near-zero scattering and near-total absorption.
• To investigate the underlying principles governing this counterintuitive optical response.

Main Methods:

• Theoretical analysis using the variation principle.
• Numerical simulations of subwavelength cylinder designs.
• Exploration of multilayered structures with realistic materials.

Main Results:

• A subwavelength cylinder design exhibiting near-zero scattering cross section.
• Absorption cross section approaching the extinction cross section.
• Generation of a needle-like scattering radiation pattern.

Conclusions:

• The developed 'dark superabsorbers' offer a novel way to control light-matter interactions.
• Potential applications include energy harvesting, low-visibility receivers, and directive light-matter interaction.
• The findings are based on a generic power distribution principle applicable to various modes and configurations.