Single-sided lens terahertz flat-top beam shaping in the Fresnel region
Abstract
In this paper, a novel, to our knowledge, analytical approach is introduced for the design of a single-sided plano-convex lens (PCL) capable of terahertz (THz) flat-top beam shaping in the Fresnel region. The lens profile, derived from geometrical optics principles, integrates collimating and beam-shaping functions into a single optical surface, thereby simplifying fabrication. The efficiency of the method is demonstrated by designing two PCLs that convert a divergent Gaussian beam from a monochromatic THz source (at 100 and 200 GHz) into flat-top beams with target radii of 400 and 500 mm at distances of 3 and 4 m, respectively. The resulting fields, evaluated through analytical, integral equation, and finite element techniques, are shown to be comparable to those produced by a conventional double-sided concave-convex lens. Furthermore, the sensitivity of the design to frequency and alignment variations is investigated, confirming the robustness of this single-curvature approach for integration into practical THz imaging systems.
Versions
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BibTeX
@misc{imanbeygi2026singlesided,
title = {{Single-sided lens terahertz flat-top beam shaping in the Fresnel region}},
author = {Ehsan Imanbeygi and Mohammad Hossein Koohi Ghamsari and Mehdi Ahmadi-Boroujeni and Babak Honarbakhsh},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06050},
eprint = {2611.06050},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06050},
}
RIS
TY - UNPB
TI - Single-sided lens terahertz flat-top beam shaping in the Fresnel region
AU - Ehsan Imanbeygi
AU - Mohammad Hossein Koohi Ghamsari
AU - Mehdi Ahmadi-Boroujeni
AU - Babak Honarbakhsh
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06050
UR - https://arxiv.org/abs/2611.06050
AB - In this paper, a novel, to our knowledge, analytical approach is introduced for the design of a single-sided plano-convex lens (PCL) capable of terahertz (THz) flat-top beam shaping in the Fresnel region. The lens profile, derived from geometrical optics principles, integrates collimating and beam-shaping functions into a single optical surface, thereby simplifying fabrication. The efficiency of the method is demonstrated by designing two PCLs that convert a divergent Gaussian beam from a monochromatic THz source (at 100 and 200 GHz) into flat-top beams with target radii of 400 and 500 mm at distances of 3 and 4 m, respectively. The resulting fields, evaluated through analytical, integral equation, and finite element techniques, are shown to be comparable to those produced by a conventional double-sided concave-convex lens. Furthermore, the sensitivity of the design to frequency and alignment variations is investigated, confirming the robustness of this single-curvature approach for integration into practical THz imaging systems.
ER -