Diffraction patterns from a phyllotaxis-type arrangement

Mihăilescu, Mona; Preda, Alexandru M.; Cojoc, D.; Scarlat, Eugen I.; Preda, L.

doi:10.1016/j.optlaseng.2008.06.004

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…It will be shown that the Fourier transform of these self-assembled structures exhibits a near-isotropic behavior depending on the distribution of the alligment of the six-fold symmetric domains [8]. It will be shown that the Fourier transform of these self-assembled structures exhibits a near-isotropic behavior depending on the distribution of the alligment of the six-fold symmetric domains [8].…”

Section: Figure 1 Sem Image Of the Corneal Nipple Arrays In The Peacomentioning

confidence: 98%

A moth-eye bio-inspired approach to planar isotropic diffraction

2010

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A regular hexagonally packed biomimetic moth-eye antireflective surface acts as a diffraction grating at short wavelengths of the visible spectrum and shallow angles of incidence. These gratings display strong backscattered iridescence with 6-fold optical symmetry. The optical symmetry of real moth eyes is effectively infinite as nature utilizes large number of uniquely orientated domains. In this work we report on a biomimetic moth-eye surface created via nanosphere lithography with a very large distribution of close-packed tessellated domains and the resulting optical symmetry is compared to that of another widely known highly isotropic diffraction grating, also inspired by nature, the sunflower pattern.A white-light laser reflectometry system is used to measure and compare the diffraction pattern isotropy from both structures. The tessellated close-packed structure diffraction pattern approaches that of infinite optical symmetry even though the underlying pattern only possesses a six-fold symmetry. Hence, the angular isotropy observed for the sunflower pattern is replicated to a large extent via a self-assembly procedure, whilst circumventing the complicated design and manufacturing requirements of the sunflower pattern.

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Section: Figure 1 Sem Image Of the Corneal Nipple Arrays In The Peacomentioning

confidence: 98%

A moth-eye bio-inspired approach to planar isotropic diffraction

2010

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“…Its far-field diffraction pattern was studied elsewhere [29] considering different values for the parameters which generate the phyllotaxis geometry. There are certain values for the parameters which give in the same time the smallest intensity in zero diffraction order and the highest intensity in the first one.…”

Section: Introductionmentioning

confidence: 99%

Natural quasy-periodic binary structure with focusing property in near field diffraction pattern

Mihăilescu¹

2010

Opt. Express

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A naturally-inspired phase-only diffractive optical element with a circular symmetry given by a quasi-periodic structure of the phyllotaxis type is presented in this paper. It is generated starting with the characteristic parametric equations which are optimal for the golden angle interval. For some ideal geometrical parameters, the diffracted intensity distribution in near-field has a central closed ring with almost zero intensity inside. Its radius and intensity values depend on the geometry or non-binary phase distribution superposed onto the phyllotaxis geometry. Along propagation axis, the transverse diffraction patterns from the binary-phase diffractive structure exhibit a self-focusing behavior and a rotational motion.

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“…Recently, in this kind of experiments, scientists use different types of structured laser beams, axicon, helical, in order to obtain de− sired intensity distribution in one plane perpendicular to the direction of propagation [4,5]. A quasi−periodic diffractive structure can be also used to focalize in a given point in Fraunhofer approximation or to create a pattern with annu− lar symmetry (with a hole in its centre) in Fresnel approxi− mation [6]. Here, we propose a diffractive structure which can focalise the light in points situated in different planes perpendicular to the propagation axe, suitable for trapping several particles.…”

Section: Introductionmentioning

confidence: 99%

Fractal-like diffractive arrangement with multiple focal points

Mihăilescu

Preda

Sobeţkii³

et al. 2009

Opto-Electronics Review

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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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Diffraction patterns from a phyllotaxis-type arrangement

Cited by 8 publications

References 12 publications

A moth-eye bio-inspired approach to planar isotropic diffraction

A moth-eye bio-inspired approach to planar isotropic diffraction

Natural quasy-periodic binary structure with focusing property in near field diffraction pattern

Fractal-like diffractive arrangement with multiple focal points

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