Strong plasmonic confinement and optical force in phosphorene pairs

Area of Science:

• Condensed matter physics
• Materials science
• Nanophotonics

Background:

• Plasmonic responses are crucial for light manipulation at the nanoscale.
• Phosphorene, a single-layer black phosphorus, exhibits unique anisotropic properties.
• Understanding plasmonic behavior in phosphorene pairs is key for novel photonic devices.

Purpose of the Study:

• To investigate the plasmonic responses in spatially separated phosphorene pairs.
• To analyze field enhancement, light confinement, and optical force.
• To explore the influence of phosphorene's anisotropic dispersion on plasmonic modes.

Main Methods:

• Theoretical investigation of plasmonic responses in phosphorene pairs.
• Analysis of direction-dependent symmetric and anti-symmetric plasmonic modes.
• Quantification of field enhancement, light confinement, and optical force.

Main Results:

• Strong anisotropic dispersion in black phosphorus leads to direction-dependent plasmonic modes.
• Symmetrical plasmonic modes exhibit significantly stronger field enhancement than anti-symmetric modes.
• Symmetrical modes offer higher light confinement (>90%) and greater optical force (>3000 pN/mW) along the armchair direction.

Conclusions:

• Symmetrical plasmonic modes in phosphorene pairs are highly effective for light manipulation.
• These findings pave the way for advanced nanoscale light control.
• The study supports the design of novel black phosphorus-based photonic devices.