Talbot Near-Field Revivals
Rephase grating modes to make shifted and unshifted near-field images.
Free theory articleRephase grating modes to make shifted and unshifted near-field images.
Concept & interpretation
The Talbot effect is a remarkable near-field diffraction phenomenon where a periodic structure, such as a diffraction grating, forms exact replicas of itself at regular distances without the use of lenses. In this module, we examine these near-field revivals using a finite periodic amplitude grating with five equal Fourier modes.
Experiment
Use the interactive module to visualize the intensity carpet and the reconstructed field profiles. The interactive diagram dynamically calculates the Talbot effect based on your selected parameters.
- Change the Period micrometers to observe its quadratic effect on the revival length zR.
- Vary the Propagation z over zR to see how the intensity profile evolves. Note the exact reconstruction at z/zR = 1 and the half-period shifted reconstruction at z/zR = 0.5.
- Adjust the Probe x over period to inspect the complex field and intensity at a specific lateral position.