On-chip continuous position control of phase singularities in nanoscale

Area of Science:

• Optics and Photonics
• Nanotechnology
• Surface Physics

Background:

• Plasmonic phase singularities are crucial for nanoscale optical manipulation.
• Precise control over these singularities is challenging.
• Vortex beams and plasmonic lenses offer potential for advanced optical control.

Purpose of the Study:

• To achieve continuous position control of plasmonic phase singularities.
• To investigate the effects of misaligned coupling on singularity behavior.
• To derive the surface plasmon polaritons field distribution for this configuration.

Main Methods:

• Utilizing misaligned coupling between a vortex beam's optical axis and a nano ring plasmonic lens.
• Deriving the surface plasmon polaritons field distribution formula.
• Analyzing the influence of offset distance and direction on singularity positioning.

Main Results:

• Demonstrated continuous position control of plasmonic phase singularities.
• Established a method to control singularity distance and angular distribution via beam offset.
• Derived the theoretical formula for surface plasmon polaritons field distribution.

Conclusions:

• Misaligned coupling provides effective nanoscale control over plasmonic phase singularities.
• The findings facilitate accurate positioning for practical applications.
• Offers deeper insights into the interaction between vortex beams and plasmonic nanostructures.