Trajectory-Based Interpretation of Laser Light Diffraction by a Sharp Edge

Abstract

In the diffraction pattern produced by a half-plane sharp edge when it obstructs the passage of a laser beam, two characteristic regions are noticeable. There is a central region, where the diffraction of laser light appears in the region of geometric shadow, while intensity oscillations are observed in the non-obstructed area. On both sides of the edge, there are also very long light traces along the normal to the edge of the obstacle. The theoretical explanation of this phenomenon is based on the Fresnel–Kirchhoff diffraction theory applied to the Gaussian beam propagation behind the obstacle. In this paper, we supplement this explanation by considering electromagnetic flow lines, which provide a more complete interpretation of the phenomenon in terms of electric and magnetic fields and flux lines; at the same time, that can be related to average photon paths.

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Correspondence to Mirjana Božić.

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Davidović, M.D., Davidović, M.D., Sanz, A.S. et al. Trajectory-Based Interpretation of Laser Light Diffraction by a Sharp Edge. J Russ Laser Res 39, 438–447 (2018). https://doi.org/10.1007/s10946-018-9738-9

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Keywords

  • Diffraction on the half-plane
  • Bohmian mechanics
  • Gaussian beam
  • electromagnetic energy flow lines