期刊
JOURNAL OF OPTICS
卷 20, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8986/aaa38c
关键词
transformation optics; waveguides; metamaterials; Airy beam
类别
资金
- National Key Projects for Basic Researches of China [2017YFA0205700, 2017YFA0303700]
- National Natural Science Foundation of China [11690033, 11621091, 61425018, 11374151]
In this paper, we experimentally demonstrate reversible wavefront shaping through mimicking gravitational field. A gradient-index micro-structured optical waveguide with special refractive index profile was constructed whose effective index satisfying a gravitational field profile. Inside the waveguide, an incident broad Gaussian beam is firstly transformed into an accelerating beam, and the generated accelerating beam is gradually changed back to a Gaussian beam afterwards. To validate our experiment, we performed full-wave continuum simulations that agree with the experimental results. Furthermore, a theoretical model was established to describe the evolution of the laser beam based on Landau's method, showing that the accelerating beam behaves like the Airy beam in the small range in which the linear potential approaches zero. To our knowledge, such a reversible wavefront shaping technique has not been reported before.
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