Work

Terahertz flat-top beam generation via triple-polarization-channel multiplexed metasurface

Year: 2025

Type: article

Abstract: Different from laser sources, terahertz emitters typically generate beams with spatial inhomogeneity and small aperture size due to limited power. This can limit system performance in applications such as imaging. Optical components for beam shaping are highly desirable. Leveraging metasurfaces' versatile wavefront manipulation capabilities and a non-orthogonal polarization multiplexing strategy, we demonstrate the simultaneous generation of terahertz flat-top beams in three distinct polarization channels. Specifically, circular, rectangular, and square beam profiles are achieved in the x -polarized, 45°, and y -polarized channels, respectively. By implementing the Gerchberg-Saxton angular spectrum iterative algorithm and constructing a full-parameter Jones matrix model, the generated flat-top beams with negligible crosstalk exhibit remarkable improvements in both intensity uniformity and edge steepness compared to the original terahertz source. These advancements enable precise radiation pattern engineering, addressing critical requirements across diverse terahertz applications.

Source: Optics and Lasers in Engineering

DOI: 10.1016/j.optlaseng.2025.109357

Authors: Jieyang Tang, Jierong Cheng, Shengjiang Chang

Institution: Nankai University

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,020

Funders: National Natural Science Foundation of China, Nankai University, Fundamental Research Funds for the Central Universities, Fundamental Research Funds for Central Universities of the Central South University