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Inverse-Designed Broadband All-Dielectric Electromagnetic Metadevices.

F Callewaert1, V Velev2, P Kumar1,2

  • 1Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA.

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|January 24, 2018
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Summary
This summary is machine-generated.

This study introduces a novel platform for creating broadband all-dielectric metadevices using inverse design and 3D printing. These non-resonant devices offer high efficiency and thin profiles for various electromagnetic applications.

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Area of Science:

  • Electromagnetics
  • Materials Science
  • Nanotechnology

Background:

  • Conventional metasurfaces often exhibit narrow bandwidth due to resonant building blocks.
  • All-dielectric metadevices offer potential for lower losses and broader operation.
  • Additive manufacturing enables complex nanostructure fabrication.

Purpose of the Study:

  • To develop a platform for designing and fabricating broadband, high-efficiency all-dielectric metadevices.
  • To overcome the narrow-band limitations of traditional metasurfaces.
  • To demonstrate the versatility of the proposed platform across different electromagnetic frequencies.

Main Methods:

  • Utilizing an inverse electromagnetic design computational method.
  • Integrating computational design with additive manufacturing (3D printing).
  • Employing low-index dielectric materials for device fabrication.

Main Results:

  • Achieved broadband operation with a spectral width (Δλ/λ) exceeding 50%.
  • Demonstrated high-efficiency (transmission >60%) and thin (≤2λ) metadevices.
  • Experimental validation at millimeter-wave frequencies using 3D-printed devices.

Conclusions:

  • The proposed platform enables the creation of non-resonant, broadband metadevices.
  • The technology is adaptable for fabricating devices from microwave to optical frequencies.
  • This approach facilitates the design and realization of advanced electromagnetic and photonic functionalities.