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Microassembly of Artificial Crystals by Inter-Particle Laser Welding and Optical Characterization

机译：颗粒间激光焊接和光学表征对人造晶体进行微组装

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To fabricate artificial crystals with any structure from monosized spherical particles, we have so far manufactured a three-dimensionally particle assembling system with a combination of pick-and-place robotic manipulation and inter-particle laser welding. In the present study, we aimed to assemble large-scale artificial crystals of polyethylene (PE) particles by mean of the new system. In this method, an optimization of the laser welding conditions was indispensable for the strong bonding with maintaining the shape of particles. Thus, the two-particle welding tests were preliminarily conducted. On the basis of this result, we successfully assembled the large-scale artificial crystals with diamond structure from the PE -ceramic or -carbon composite particles. In order to discuss applicability of the obtained crystals to terahertz (THz) wave photonic crystals, the transmittance spectrum of the crystals was evaluated by a THz wave time domain spectroscopy. The PE-ceramic particle crystal presented an ideal photonic band gap which perfectly agreed with the theoretical one.
机译：为了用单一尺寸的球形颗粒制造具有任何结构的人造晶体，到目前为止，我们已经制造出了一种三维颗粒组装系统，该系统将取放机器人操作和颗粒间激光焊接相结合。在本研究中，我们旨在通过新系统组装大规模的聚乙烯（PE）颗粒人工晶体。在这种方法中，优化激光焊接条件对于保持颗粒形状的牢固结合是必不可少的。因此，初步进行了两颗粒焊接试验。基于此结果，我们成功地从PE陶瓷或-碳复合颗粒组装了具有金刚石结构的大型人造晶体。为了讨论所获得的晶体对太赫兹（THz）波光子晶体的适用性，通过THz波时域光谱法评估了晶体的透射光谱。 PE-陶瓷粒子晶体呈现出理想的光子带隙，与理论上完全一致。

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