Multi-height metasurface for wavefront manipulation fabricated by direct laser writing lithography

Area of Science:

• Photonics and Nanotechnology
• Optical Engineering

Background:

• Metasurfaces offer advanced control over light wavefronts.
• Dielectric metasurfaces provide low-loss optical manipulation.

Purpose of the Study:

• To introduce novel dielectric metasurfaces for wavefront manipulation.
• To achieve broadband phase modulation for optical communications.

Main Methods:

• Designing 3x3 dielectric metasurface regions with varying feature heights.
• Utilizing direct laser writing for high-precision fabrication.
• Characterizing polarization-dependent and independent functionalities.

Main Results:

• Achieved phase depth of 0-2π at 1550 nm with average transmittances of 80.1% (polarization-dependent) and 85.1% (polarization-independent).
• Demonstrated broadband phase modulation from 1460.1 nm to 1618.0 nm.
• Fabricated metasurfaces with varying nanofeature heights in a single process.

Conclusions:

• The developed dielectric metasurfaces enable efficient and broadband wavefront manipulation.
• High-precision fabrication via direct laser writing facilitates mass production.
• These metasurfaces are promising for developing efficient and ultracompact optical devices.