Refractive aspherical lens for terahertz imaging

In this paper, we introduce two convex-plano lenses for terahertz (THz) imaging applications. The first lens is determined to use an aspherical surface and compared with a similar spherical lens that has the same diameter, thickness, and back focal length. We demonstrate the superiority of aspherica...

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Bibliographic Details
Published in:Optics communications 2019-02, Vol.433, p.14-17
Main Authors: Li, Weifan, Qi, Feng, Wang, Yelong, Liu, Pengxiang, Liu, Zhaoyang
Format: Article
Language:English
Subjects:
Aspherics
Electromagnetic optics
Terahertz imaging
Terahertz lenses
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Summary:In this paper, we introduce two convex-plano lenses for terahertz (THz) imaging applications. The first lens is determined to use an aspherical surface and compared with a similar spherical lens that has the same diameter, thickness, and back focal length. We demonstrate the superiority of aspherical surface by electromagnetic simulations and focal plane scanning experiments. The second lens has a relatively shorter focal length and has excellent focusing capability. By comparing with other two previous studies, we estimate that this lens may achieve high-resolution in THz imaging applications.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2018.09.071