Undergraduate experiment with fractal diffraction gratings

Author: Monsoriu Juan A   Furlan Walter D   Pons Amparo   Barreiro Juan C   Giménez Marcos H  

Publisher: IOP Publishing

ISSN: 0143-0807

Source: European Journal of Physics, Vol.32, Iss.3, 2011-05, pp. : 687-694

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Abstract

We present a simple diffraction experiment with fractal gratings based on the triadic Cantor set. Diffraction by fractals is proposed as a motivating strategy for students of optics in the potential applications of optical processing. Fraunhofer diffraction patterns are obtained using standard equipment present in most undergraduate physics laboratories and compared with those obtained with conventional periodic gratings. It is shown that fractal gratings produce self-similar diffraction patterns which can be evaluated analytically. Good agreement is obtained between experimental and numerical results.