期刊
OPTICS LETTERS
卷 46, 期 11, 页码 2746-2749出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.421992
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类别
资金
- National Key Research and Development Program of China [2019YFA0210203]
- National Natural Science Foundation of China [61971013]
The translated text introduces a terahertz subwavelength imaging method capable of extracting only the edges and fine features of the targets with high-contrast edge detection resolution.
Terahertz imaging has recently attracted great attention owing to the abilities of high penetration and low ionizing damages. However, the low resolution and low contrast resulting from the diffraction limit and unwanted background illumination significantly hinder the extensive usage. In this Letter, we propose and numerically demonstrate a terahertz subwavelength imaging method capable of extracting only the edges and fine features of the targets. The underlying physics is the efficient transmission of the scattering evanescent waves related to key geometric information while blocking the propagating components. By exploiting the structurally induced plasmons in a bounded metallic waveguide, the transmission channel for evanescent waves is realized by hyperbolic metamaterials through periodically stacking dielectric layers. On this basis, high-contrast edge detection with a resolution up to 0.1 lambda is demonstrated at terahertz wavelengths. The proposed terahertz imaging method may find important applications in non-destructive testing, weak scattering object detection, and high-contrast microscopy. (C) 2021 Optical Society of America
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