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Distance and depth modulation of Talbot imaging via specified design of the grating structure

2022; Optica Publishing Group; Volume: 30; Issue: 7 Linguagem: Inglês

10.1364/oe.449807

1094-4087

Zhenghui Zhang, Biao Lei, Guobo Zhao, Yaowen Ban, Zhengshang Da, Yishan Wang, Guoyong Ye, Jinju Chen, Hongzhong Liu,

Photonic and Optical Devices

For positioning Talbot encoder and Talbot lithography, etc., properties manipulation of Talbot imaging is highly expected. In this work, an investigation on the distance and depth modulation of Talbot imaging, which employs a specially designed grating structure, is presented. Compared with the current grating structure, the proposed grating structure is characterized by having the phase layers with uneven thicknesses. Such a specific structural design can cause the offset of Talbot image from its nominal position, which in turn generates the spatial distance modulation of self-imaging and imaging depth expansion. Theoretical analysis is performed to explain its operating principle, and simulations and experiments are carried out to demonstrate its effectiveness.