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Design Formulas for Flat Gradient Index Lenses with Planar or Spherical Output Wavefront

Journal Article (2024)
Author(s)

Weiya Hu (Student TU Delft)

Caspar M. Martin (TU Delft - Tera-Hertz Sensing)

Daniele Cavallo (TU Delft - Tera-Hertz Sensing)

Research Group
Tera-Hertz Sensing
DOI related publication
https://doi.org/10.1109/TAP.2024.3363433
More Info
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Publication Year
2024
Language
English
Research Group
Tera-Hertz Sensing
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.@en
Issue number
3
Volume number
72
Pages (from-to)
2555-2563
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Abstract

A semi-analytical method is presented for the design of gradient index (GRIN) flat lenses. Closed-form expressions are derived to define the refractive index distribution of the lens, for several cases: collimating lenses with on-axis feed, collimating lenses with off-axis feed, lenses converting spherical wavefronts with different wavenumbers, lenses changing the focal number of a quasi-optical system, and Fresnel zone lenses. The design equations are validated by ray-tracing simulations in inhomogeneous media, implemented by numerical solution of the Eikonal equation.

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