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In this work, we present a highly efficient, miniaturized optical filter with a plasmonic filter-based microlens array for a high-efficiency multispectral infrared sensor. Microlens arrays enhance light-gathering efficiency in infrared elements, resulting in high quantum efficiency, while the plasmonic filter, utilizing a 3D post array nanostructure, offers wavelength selectivity. This approach streamlines the integration of micro/nanostructures into infrared imaging sensors, significantly enhancing sensing performance beyond existing methods.
In this study, we prepared LiTaO3 polycrystalline powder by solid state reaction synthesis from the raw powder of Li2CO3, Ta2O5, and cyanuric acid, which is an additive for a short reaction time and relatively low temperatures. The cyanuric acid, added into the mixture of Li2CO3 and Ta2O5, plays a role of fuel and inducer to produce intermediate compounds. Several temperatures and cyanuric acid composition ratio were employed to optimize the synthesis condition of pretreated LiTaO3. Structural and composition analysis were conducted to characterize the synthesized LiTaO3 powders. The optimized synthesis shows excellent ability to reduce lithium-ion volatilization and suggests an efficient way to manufacture high-quality LiTaO3 polycrystalline powders.
In this study, we designed hot-zone structure in czochralski furnace for LiTaO3 single crystal growth. We added ring parts above the iridium crucible in which LiTaO3 crystal grow. It reduced heat dissipation and temperature gradient inside the hot-zone through bothering heat flow toward upper side of the system. Vertical and horizontal temperature gradient in whole range position was analyzed. Optimized size and position of ring parts were designed. For the simulation of this system, CGSim SW was used. We expect that our research results would contribute to the development of LiTaO3 single crystal growing technology.
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