Europhys. Lett., 63 (1) , pp. 28-34 (2003)
Novel light beam propagation through optical "potential well"X.-H. Huang1 and C.-F. Li1, 2
1 Department of Physics, Shanghai University - 99 Shangda Road Shanghai 200436, PRC
2 State Key Laboratory of Transient Optics Technology Xi'an Institute of Optics and Precision Mechanics, Academia Sinica 234 West Youyi Road, Xi'an 710068, PRC
(Received 1 November 2002; accepted in final form 2 May 2003)
The propagation of a Gaussian-shaped beam through a slab of optically denser dielectric medium in the air, a two-dimensional optical counterpart of the quantum potential well, is investigated in order to elucidate the negative lateral shifts of transmitted and reflected beams. It is shown that the locus of the peak of the beam inside the slab consists of two parts. One propagates backwards and seems to be the geometric reflection of the other that propagates forwards. But they are not continuous with the loci of the peaks of the incident and reflected beams. A restriction to the thickness of the slab is obtained that is necessary for the shape of the beam to remain unchanged in the travelling.
42.25.Gy - Edge and boundary effects; reflection and refraction.
78.20.Bh - Theory, models, and numerical simulation.
© EDP Sciences 2003