Affiliation:
1. Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China
2. Beijing Key Laboratory for Metamaterials and Devices Key Laboratory of Terahertz Optoelectronics, and Beijing Advanced Innovation Center for Imaging Technology Department of Physics Capital Normal University Beijing 100048 China
Abstract
AbstractOptical pattern recognition (OPR) has the advantage of single intensity detection ability for low‐cost terahertz (THz) systems of imaging or security checks. However, conventional 4f‐system‐based OPR is limited by the paraxial approximation and bulky device volumes for THz applications. Here, a full‐diffraction‐based 4f‐less OPR method is proposed using a single complex‐amplitude‐modulating metasurface, which is valid for systems with large Fresnel numbers. Moreover, a laser‐induced graphene technique is applied for processing the device. A 15 mm × 15 mm metasurface can be fabricated by one‐step laser writing in 34 s, indicating the potential of the proposed method in developing THz OPR systems with miniaturization, fast fabrication, and low‐cost.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
8 articles.
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