Investigation of Quadrate Fresnel Zone Plates Fabricated by Femtosecond Laser Direct Writing

被引：3

作者：

Sun, Xiaoyan ^{[1
]}

Zhou, Fang ^{[1
]}

Duan, Lian ^{[1
]}

Duan, Ji-an ^{[1
]}

机构：

[1] Cent South Univ, Coll Mech & Elect Engn, State Key Lab High Performance Complex Mfg, Changsha 410083, Peoples R China

来源：

APPLIED SCIENCES-BASEL | 2022年 / 12卷 / 15期

基金：

中国国家自然科学基金;

关键词：

quadrate Fresnel zone plate; diffraction performance; phase shift; square focus; femtosecond laser; PHASE; LENS;

D O I：

10.3390/app12157788

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The circular Fresnel zone plate (FZP) has been extensively used in micro-optics due to its outstanding focusing performance. Despite that, the curved edge of the circular zone has drawbacks limiting its use in terahertz imaging, array generator, and micro/nano-manufacturing. Therefore, a circular structure is not very practical to use. In this paper, Quadrate FZPs were proposed, and diffraction properties of the linear FZP (L-FZP), orthogonal FZP (O-FZP), and square FZP (S-FZP) were studied. Theoretically, the relationship between half side length of S-FZP and the radius of circular FZP is established, and the focal length formula of the S-FZP is derived. The linear and crossline focusing properties of quadrate FZPs were studied experimentally along with simulations. With the addition of blockers and phase shifting, the square and rectangular diffraction patterns were successfully obtained.

引用

页数：12

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