Time-Reversed Diffraction

Details Time-Reversed Diffraction Time-Reversed Diffraction

2000-03-23

arxiv.org/abs/physics/0003058v1

Physics

Optics

Scientific paper

We show that a time-reversed formulation of Huygens-Kirchhoff diffraction can be used to deduce the transverse and longitudinal fields of a Gaussian laser beam, starting from a simple assumption of a Gaussian beam profile in the far field. An attempt to apply this technique to the far fields of a Hertzian dipole shows how the laws of diffraction do not permit a wave to be focused to a volume smaller than a cubic wavelength in a charge-free region.

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