Sensitivity of transverse shift inside a double-grating Talbot interferometer

Deachapunya, Sarayut; Srisuphaphon, Sorakrai

doi:10.1016/j.measurement.2014.08.018

Cited by 19 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this charge separation [17] is hardly performed in the high vortex numbers [16]. Here, we show the use of optical near-field effect such as Talbot effect to separate the charge and the vortex numbers at higher orders since the sensitivity of the near-field Talbot effect is extremely high [18]. The self-imaging of periodic structures in optical near-field diffraction can be observed when a parallel monochromatic light enters a diffraction grating and forms an interference pattern behind the grating.…”

Section: Introductionmentioning

confidence: 87%

A study of optical vortices inside the Talbot interferometer

Panthong¹,

Srisuphaphon²,

Pattanaporkratana³

et al. 2015

Preprint

Self Cite

View full text Add to dashboard Cite

The optical Talbot interferometer has been used to explore the topological charges of optical vortices. We recorded the self-imaging of a diffraction grating in the near-field regime with the optical vortex of several topological charges. Our twisted light was generated by a spatial light modulator (SLM). Previous studies showed that interferometric methods can determine the particular orbital angular momentum (OAM) states, but a large number of OAM eigenvalues are difficult to distinguish from the interference patterns. Here, we show that the Talbot patterns can distinguish the charges as well as the OAM of the vortices with high orders. Owing to high sensitivity and self-imaging of Talbot effect, several OAM eigenvalues can be distinguished by direct measurement. We assure the experimental results with our theory. The present results are useful for classical and quantum metrology as well as future implementations of quantum communications.

show abstract

Section: Introductionmentioning

confidence: 87%

A study of optical vortices inside the Talbot interferometer

Panthong¹,

Srisuphaphon²,

Pattanaporkratana³

et al. 2015

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…A single photon detector is placed behind the slit (Figure 1). The interference pattern can then be revealed by scanning transversely the grating over the slit or vice versa [19].…”

Section: Theory and Methodsmentioning

confidence: 99%

Realization of phase modulation using a spatial light modulator in the quantum Talbot configuration

Deachapunya,

Srisuphaphon,

Panthong

et al. 2016

Preprint

Self Cite

View full text Add to dashboard Cite

We demonstrate the quantum Talbot effect using pairs of single photons produced by parametric down conversion. In contrast to the previous works, we use a programmable spatial light modulator to behave as a diffraction grating. Thus, the investigation of the Talbot diffraction patterns under the variation of grating structure can be easily performed. The influence of spectral bandwidth of the down-converted photons on the diffraction pattern is also investigated. A theoretical model based on the wave nature of photons is presented to explain the Talbot diffraction pattern under varying conditions. The measured diffraction patterns are in good agreement with the theoretical prediction. We are convinced that our study improves the understanding of the quantum Talbot effect.

show abstract

“…These techniques improve the collimation degree of the beams in several orders of magnitude. Collimation methods based on Talbot interferometry use Talbot effect to create a moiré pattern at the output of a double grating system where the second grating is placed at a self-image of the first one [1,[11][12][13][14]. This idea has been modified in several ways in the recent years: by lateral displacement of one of the gratings, by changing the periods of the gratings, by changing their shape, etc [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Collimation technique and testing applied to finite size polychromatic sources

Torcal-Milla

Sanchez‐Brea

2017

Appl. Opt.

View full text Add to dashboard Cite

Highly collimated beams are required in numerous applications and techniques. Different methods have been proposed for collimating monochromatic point light sources during the recent years. In this work, we analyze how a finite size and polychromatic light source can be collimated using only one diffraction grating and a CMOS camera placed after the source and the collimating lens. For this, we determine the period of the fringes diffracted by the grating and compare it with the period of the grating. Analytical equations are obtained to predict the amplitude of the fringes and their period. Since self-images disappear for finite size polychromatic sources at long distances from the grating, the period has to be measured close to the grating. In addition, we give an analytical equation to determine the error in the positioning of the source in terms of the source size and the setup parameters. Finally, we experimentally corroborate the obtained analytical formalism using a white LED of size s=0.6 mm collimated by a lens with focal length f=25 mm, and a Ronchi binary grating of period d=250 μm. In this case, we achieve an experimental error in the positioning of the source with respect to the focal plane of the lens of δz_exp=92 μm.

show abstract

Sensitivity of transverse shift inside a double-grating Talbot interferometer

Cited by 19 publications

References 17 publications

A study of optical vortices inside the Talbot interferometer

A study of optical vortices inside the Talbot interferometer

Realization of phase modulation using a spatial light modulator in the quantum Talbot configuration

Collimation technique and testing applied to finite size polychromatic sources

Contact Info

Product

Resources

About