We theoretically research the characteristics of tunable multipolar Fano resonances in novel-designed Au ring-disk plasmonic nanostructures. We systematically study some structural parameters that influence the multipolar Fano resonances of the nanostructures. Adjustment of the radius (R1 and R2) of the Au ring, the radius (R3) of the Au disk and the thickness (H) of the Au ring-disk can effectively adjust the multipolar Fano resonances. The complex field distributions excited by a Au ring-disk can produce dark resonance modes. At the frequency of the multipolar Fano resonances, strong localized field distributions can be obtained. The Fano resonances exhibit strong light-extinction properties in Au ring-disk nanostructures, which can be applied to an optical tunable filter and optical switch.
Advances in the fundamentals and applications of diffraction gratings have received much attention. However, conventional diffraction gratings often suffer from higher-order diffraction contamination. Here, we introduce a simple and compact single optical element, named inclined rectangular aperture gratings (IRAG), for quasi suppression of higher-order diffractions. We show, both in the visible light and soft x-ray regions, that IRAG can significantly suppress higher-order diffractions with moderate diffraction efficiency. Especially, as no support strut is needed to maintain the free-standing patterns, the IRAG is highly advantageous to the extreme-ultraviolet and soft x-ray regions. The diffraction efficiency of the IRAG and the influences of fabrication constraints are also discussed. The unique quasi-single order diffraction properties of IRAG may open the door to a wide range of photonic applications.
To control the building resolution and accuracy of high-resolution Stereolithography (SL) system, a novel building parameter which is the ratio of laser power to laser beam scanning speed has been proposed. Researches were performed to investigate the relationship of cured line width and depth with the ratio of laser power to laser beam scanning speed of the SL system. The experimental results show that cured depth and width increase with the ratio of laser power to scanning speed. Based on the cured line width and depth obtained in the experiment, empirical equations predicting cured line width and depth according to the ratio of laser power to scanning speed in the SL system have been established by using least squares method, the empirical equations provide the foundation for improving building resolution and accuracy of high-resolution SL system with linewidth accurately compensation and layer thickness appropriately setup in the high-resolution SL system.
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