Focal shift effect of terahertz wide-aperture refractive lens

被引：0

作者：

Fan, L. I. Wei - ^{[1
,2
,3
]}

Feng, Q., I ^{[1
,2
,3
]}

Long, W. A. N. G. Ye - ^{[1
,2
,3
]}

Xiang, L. I. U. Peng - ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Key Lab Optoelect Informat Proc, Shenyang 110169, Peoples R China

[2] Key Lab Terahertz Imaging & Sensing, Shenyang 110169, Liaoning, Peoples R China

[3] Chinese Acad Sci, Shenyang Inst Automation, Shenyang 110169, Peoples R China

来源：

JOURNAL OF INFRARED AND MILLIMETER WAVES | 2023年 / 42卷 / 03期

关键词：

terahertz lens; focal shift; finite element analysis; aspherics;

D O I：

10.11972/j.issn.1001-9014.2023.03.008

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The focal shift effect of terahertz (THz) beam focusing when using a wide-aperture refractive lens has been investigated. The deviation of focus position caused by the focal shift effect can adversely affect the imaging or measurement quality of a THz system. In this study, reference values of relative focal shifts and combinations of different lens apertures, focal lengths, and working frequencies were analyzed and discussed through theoretical calculation and finite element analysis simulation. When using the commercial lens, the actual focus was determined based on the focal shift effect to ensure the working efficiency of a terahertz system. Concerning the customized lens design, the focal shift distance was compensated in the focal length optimization according to the working frequency. These two approaches guaranteed the good performance of a THz system.

引用

页码：345 / 349

页数：5

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