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Large-Angle, Multifunctional Metagratings Based on Freeform Multimode Geometries.

David Sell1, Jianji Yang1, Sage Doshay1

  • 1Department of Applied Physics and ‡Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States.

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Summary
This summary is machine-generated.

Silicon-based metagratings designed with inverse freeform techniques achieve large-angle light deflection and multifunctional performance. This new approach enables high-efficiency photonic devices by engineering nanoscale patterns and optical modes.

Keywords:
Bloch modeMetasurfacesblazed gratinglarge-angle deflectionmetamaterialsmultifunctionmultimode

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Area of Science:

  • Photonics and Nanotechnology
  • Optical Engineering

Background:

  • Current nano-optical devices often rely on stitching non-interacting waveguide structures.
  • Achieving large-angle deflection and multifunctionality in compact devices remains a challenge.

Purpose of the Study:

  • To demonstrate silicon-based metagratings with large-angle, multifunctional performance using inverse freeform design.
  • To explore a new paradigm in nano-optical mode engineering for enhanced light control.

Main Methods:

  • Utilizing inverse freeform design to create nonintuitive nanoscale patterns on silicon.
  • Fabricating metagratings and analyzing their Bloch modes, spatial mode profiles, and coupling dynamics.

Main Results:

  • Demonstrated metagratings capable of deflecting light to angles as large as 75°.
  • Developed multifunctional devices that steer light beams to different diffraction orders based on wavelength.
  • Achieved high-efficiency performance through a large number of spatially overlapping optical modes.

Conclusions:

  • Inverse freeform design offers a powerful and versatile approach for realizing high-performance nano-optical devices.
  • This method represents a significant advancement over existing techniques, enabling new classes of photonic systems.
  • The engineered nanoscale patterns and optical modes provide unprecedented control over light fields.