用于太赫兹成像的亚波长聚焦的二元衍射透镜

IF 3.3 2区物理与天体物理 Q2 OPTICS

Chinese Optics Letters Pub Date : 2023-01-01 DOI:10.3788/col202321.030501

Ran Ning, Dayong Wang, L. Rong, Jie Zhao, Yunxin Wang, Shufeng Lin

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引用次数: 0

摘要

聚光透镜是高分辨率太赫兹成像的关键部件之一。本文提出了一种用于工作在278.6 GHz的扫描成像系统的二元衍射透镜，该透镜产生束腰直径为0.65 mm的会聚光束，实现了1 mm的横向成像分辨率。该低成本太赫兹透镜由不同半径的同心圆组成，采用受激退火算法进行优化，并采用三维打印技术制备。与传统的透射式凸透镜相比，通过减小照射光束的焦斑，实现了更高的分辨率和更好的成像质量。这种类型的透镜将使太赫兹成像更接近实际应用，如无损检测和其他场景。

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Binary diffractive lens with subwavelength focusing for terahertz imaging

The converging lens is one of the key components in high-resolution terahertz imaging. In this Letter, a binary diffractive lens is proposed for the scanning imaging system working at 278.6 GHz, in which a convergent beam with a waist diameter of 0.65 mm is generated, and 1 mm lateral imaging resolution is realized. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, higher resolution and enhanced imaging quality are achieved via smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.

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来源期刊

Chinese Optics Letters 物理-光学

CiteScore

5.60

自引率

20.00%

发文量

180

审稿时长

2.3 months

期刊介绍： Chinese Optics Letters (COL) is an international journal aimed at the rapid dissemination of latest, important discoveries and inventions in all branches of optical science and technology. It is considered to be one of the most important journals in optics in China. It is collected by The Optical Society (OSA) Publishing Digital Library and also indexed by Science Citation Index (SCI), Engineering Index (EI), etc. COL is distinguished by its short review period (~30 days) and publication period (~100 days). With its debut in January 2003, COL is published monthly by Chinese Laser Press, and distributed by OSA outside of Chinese Mainland.