Spin-multiplexed terahertz image edge detection based on extrinsic chirality in all-dielectric metasurface
Abstract
Extrinsically chiral metasurfaces can exhibit pronounced chiral responses in planar structures without intrinsic chirality, making them attractive for spin-selective light manipulation. Here, we propose a transmissive all-dielectric terahertz metasurface for image edge detection. Owing to the extrinsic chiral response, the metasurface enables edge-enhanced imaging under right-handed circularly polarized incidence near 0.69 THz, while preserving bright-field imaging under left-handed circularly polarized incidence. Spatial-frequency analysis shows that the effective numerical aperture of the device is approximately 0.4, indicating the terahertz image edge detection can be achieved over a broad spatial-frequency range. This work provides a new design route toward transmissive terahertz all-optical image processing with spin selectivity and a large numerical aperture.
Related
- Physics Based Triple Debye Dielectric Modeling and Multi Layer ADE FDTD Simulation of Terahertz Pulse Reflection for Breast Cancer Detection
- Compact Metasurface-Based Spatially Multiplexed Snapshot Spectral Imaging via Joint Learning of Optical Encoding and Spectral Reconstruction
- Magneto-optical intensity effect in a transparent perforated all-dielectric metasurface with an anapole state
- Polarization-Multiplexed Spatial Filtering in a Symmetric \ce{TiO2} Metasurface with an Anisotropic van der Waals Gap Fill
- Low-loss amorphous dielectric metasurface mirror for precision optical cavities
BibTeX
@misc{tang2026spinmultiplexed,
title = {{Spin-multiplexed terahertz image edge detection based on extrinsic chirality in all-dielectric metasurface}},
author = {Yuxin Tang and Shichao Zhao and Li Luo and Tingting Tang and Hang Xu and Jie Li},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.25147},
eprint = {2609.25147},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.25147},
}
RIS
TY - UNPB
TI - Spin-multiplexed terahertz image edge detection based on extrinsic chirality in all-dielectric metasurface
AU - Yuxin Tang
AU - Shichao Zhao
AU - Li Luo
AU - Tingting Tang
AU - Hang Xu
AU - Jie Li
PY - 2026
DA - 2026/09/21
PB - arXiv
DO - 10.48550/arxiv.2609.25147
UR - https://arxiv.org/abs/2609.25147
AB - Extrinsically chiral metasurfaces can exhibit pronounced chiral responses in planar structures without intrinsic chirality, making them attractive for spin-selective light manipulation. Here, we propose a transmissive all-dielectric terahertz metasurface for image edge detection. Owing to the extrinsic chiral response, the metasurface enables edge-enhanced imaging under right-handed circularly polarized incidence near 0.69 THz, while preserving bright-field imaging under left-handed circularly polarized incidence. Spatial-frequency analysis shows that the effective numerical aperture of the device is approximately 0.4, indicating the terahertz image edge detection can be achieved over a broad spatial-frequency range. This work provides a new design route toward transmissive terahertz all-optical image processing with spin selectivity and a large numerical aperture.
ER -