Recording Bessel-like beam shapes generated by plasmonics lens.

Area of Science:

• Optics and Photonics
• Nanotechnology
• Materials Science

Background:

• Plasmonic lenses offer unique light manipulation capabilities at the nanoscale.
• High aspect ratio structures are crucial for microfabrication and advanced optical components.
• Bessel-like beams provide non-diffracting propagation, ideal for precise patterning.

Purpose of the Study:

• To investigate the use of a plasmonic lens for recording Bessel-like beam shapes.
• To demonstrate the fabrication of high aspect ratio micro-structures using this plasmonic lens.
• To explore the influence of oblique incidence and metal thickness on micro-structure formation.

Main Methods:

• A negative photoresist layer was spin-coated onto a plasmonic lens featuring a nano-scale metallic ring opening.
• The beam shape emitted from the plasmonic lens was recorded, forming a high aspect ratio structure.
• Oblique incidence was applied to the metallic ring structure to create inclined micro-structures, with variations based on metal thickness.

Main Results:

• The plasmonic lens successfully recorded the shape of the Bessel-like beam.
• Increased inner and outer diameters of the metallic ring led to a higher aspect ratio structure after exposure.
• Different metal thicknesses resulted in distinct exposure outcomes, influencing micro-structure formation.

Conclusions:

• The study confirms the feasibility of recording Bessel-like beam shapes with a plasmonic lens.
• It is demonstrated that plasmonic lenses can fabricate high aspect ratio structures through controlled exposure.
• The findings highlight the potential of plasmonic lenses for advanced microfabrication applications.