A simple description of near-field and far-field diffraction

Temnuch, W.; Deachapunya, Sarayut; Panthong, Pituk; Chiangga, Surasak; Srisuphaphon, Sorakrai

doi:10.1016/j.wavemoti.2018.01.002

Cited by 7 publications

(1 citation statement)

References 33 publications

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“…In the Talbot effect for the near-field, grating self-images are located repeatedly from the plane of a diffraction grating that is probed with coherent light. While this was first recognized by Talbot [22], it has been investigated also recently [23][24][25][26]. The influence of a vortex beam on the 2D Talbot effect has been explored in 2D diffraction configurations with optical lattices for quasi-OAM states [27] and a 2D periodic grating with terahertz waves [28,29] and with visible range light [30] from the coherent source.…”

Section: Introductionmentioning

confidence: 99%

Probing vortex beams based on Talbot effect with two overlapping gratings

Buathong¹,

Srisuphaphon²,

Deachapunya³

2022

J. Opt.

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In a prior report the optical vortex was characterized using the near-ﬁeld Talbot eﬀect [1, 2]. This near-ﬁeld technique can resolve both order and charge of the orbital angular momentum state of the vortex beam. We have proposed before that a small open fraction of the grating in the Talbot conﬁguration can improve the image contrast [3]. In this study, we combine these previously reported techniques, i.e. the Talbot eﬀect for probing an optical vortex and overlapping gratings to manipulate the open fraction. Both theoretical simulation and experimental demonstration are presented here. We believe that our technique can be an alternative method for optical vortex imaging, and could be useful in optical applications.

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