Topic
Moiré pattern
About: Moiré pattern is a research topic. Over the lifetime, 1917 publications have been published within this topic receiving 27176 citations. The topic is also known as: moiré fringes & moire pattern.
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01 Sep 2012
TL;DR: Design, construction and evaluation of a prototype to detect red interference Moiré patterns are presented and gratings produced using photochemical techniques and a programming original code are presented.
Abstract: Design, construction and evaluation of a prototype to detect red interference Moire patterns are presented. Fringes are generated by a red solid state laser whose light beam is transmitted through grids constructed ad-hoc with Moire patterns. These gratings are produced using photochemical techniques and a programming original code. A printed circuit board (PCB) of commercial red photodiodes mounted in a mechanical assembly optical rail ensures experiment reproducibility and allows light intensity quantification in different areas of the selected transmitted pattern.
TL;DR: In this article, the Fourier theory is used to suppress the moire fringes of half-tone motifs when they are generated by a scanning system which introduces a periodic displacement defect, and it is shown that the fringes may be eliminated in the continued presence of the defect when it is in the direction of scan lines, but cannot be suppressed when the displacement is perpendicular to this direction.
Abstract: Arrays of motifs, such as are found in half-tone images, may exhibit unwanted moire fringes when they are generated by a scanning system which introduces a periodic displacement defect. It is shown that the fringes may be eliminated in the continued presence of the defect when it is in the direction of the scan lines, but cannot be suppressed when the displacement is perpendicular to this direction. The appropriate Fourier theory is presented and suppression of the moire fringes for one particular defect is illustrated.
TL;DR: In this paper , a real-space imaging of periodic lattice distortions in thin epitaxial films and report an emergent periodic nanotexture in a Mott insulator is presented.
Abstract: New properties and exotic quantum phenomena can form due to periodic nanotextures, including Moire patterns, ferroic domains, and topologically protected magnetization and polarization textures. Despite the availability of powerful tools to characterize the atomic crystal structure, the visualization of nanoscale strain-modulated structural motifs remains challenging. Here, we develop nondestructive real-space imaging of periodic lattice distortions in thin epitaxial films and report an emergent periodic nanotexture in a Mott insulator. Specifically, we combine iterative phase retrieval with unsupervised machine learning to invert the diffuse scattering pattern from conventional X-ray reciprocal-space maps into real-space images of crystalline displacements. Our imaging in PbTiO3/SrTiO3 superlattices exhibiting checkerboard strain modulation substantiates published phase-field model calculations. Furthermore, the imaging of biaxially strained Mott insulator Ca2RuO4 reveals a strain-induced nanotexture comprised of nanometer-thin metallic-structure wires separated by nanometer-thin Mott-insulating-structure walls, as confirmed by cryogenic scanning transmission electron microscopy (cryo-STEM). The nanotexture in Ca2RuO4 film is induced by the metal-to-insulator transition and has not been reported in bulk crystals. We expect the phasing of diffuse X-ray scattering from thin crystalline films in combination with cryo-STEM to open a powerful avenue for discovering, visualizing, and quantifying the periodic strain-modulated structures in quantum materials.