Fractal-like diffractive arrangement with multiple focal points |
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Authors: | M Mihailescu A M Preda A Sobetkii A C Petcu |
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Institution: | (1) Institute of Structural Physics, Dresden University of Technology, Zellescher Weg 16, 01062 Dresden, Germany;(2) II. Physikalisches Institut, Aachen University (RWTH), Templergraben 55, 52056 Aachen, Germany |
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Abstract: | In this paper we introduce a diffractive structure with a geometry which contains multiple Fresnel zone plates (MFZP) disposed
in an arrangement based on a fractal-like rule. The corresponding diffracted intensity in planes perpendicular to the propagation
axe presents two or more focal points. Their position and magnitude depend on geometrical parameters of the MFZP and on dimensions
in the fractal-like arrangement. In our simulations we also analyze the influence in diffraction pattern of different non-binary
phase levels in the MFZP plane. The MFZP structures with different values of geometrical and phase parameters are addressed
to an optoelectronic device liquid crystal spatial light modulator (LCSLM), the experimental and simulation results are in
a good agreement. The MFZP geometry with better optical parameters in diffraction pattern is then made on glass using electron
beam lithography technique. |
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