4f‐Less Terahertz Optical Pattern Recognition Enabled by Complex Amplitude Modulating Metasurface Through Laser Direct Writing
Source abstract
Abstract
Abstract Optical 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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Terahertz technology and applications · Metamaterials and Metasurfaces Applications · Photonic and Optical Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China
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
Funding
National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality
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