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A Computational Design Framework for Efficient, Fabrication Error-Tolerant, Planar THz Diffractive Optical Elements.

Sourangsu Banerji1, Berardi Sensale-Rodriguez2

  • 1Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT, 84112, USA.

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|April 11, 2019
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Summary
This summary is machine-generated.

We developed ultra-thin, error-tolerant terahertz (THz) optical elements using a novel computer-aided design. This approach enables efficient, scalable, and broadband THz devices, overcoming previous manufacturing limitations.

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Area of Science:

  • Optics and Photonics
  • Computational Design
  • Terahertz Technology

Background:

  • Traditional terahertz (THz) optical elements face challenges in fabrication tolerance, scalability, and broadband operation.
  • Metasurfaces, while promising, often involve complex fabrication and limited error tolerance.

Purpose of the Study:

  • To demonstrate a novel computational design framework for fabricating ultra-thin, efficient, and error-tolerant diffractive terahertz optical elements.
  • To overcome the limitations of existing terahertz optical element design strategies, particularly concerning scalability and fabrication errors.

Main Methods:

  • Utilizing a computer-aided optimization-based search algorithm for designing diffractive optical elements.
  • Modeling component operation via scalar diffraction of electromagnetic waves through 3D-printed polymer structures.
  • Designing and demonstrating specific THz optical elements: a broadband spherical lens, a spectral splitter, and a transmissive hologram.

Main Results:

  • Successfully designed and demonstrated ultra-thin (1.5-3λ₀) diffractive THz optical elements with high Numerical Aperture (N.A.) and aberration correction.
  • Achieved broadband operation (0.1-0.6 THz) across various designed elements, including lenses, spectral splitters, and holograms.
  • Validated the fabrication-error tolerant and scalable nature of the proposed all-dielectric computational design approach.

Conclusions:

  • The demonstrated hybrid computational and structural design approach offers a significant advancement in THz optical element design.
  • This method provides advantages over metasurfaces, including ease of modeling, facile manufacturing, planar geometry, high efficiency, and broadband operation.
  • The framework is extendable to various optical elements across different wavelength regimes, offering a versatile platform for future optical device development.