Dielectric multilayer photonic-band-gap structures, called one-dimensional photonic crystals (1DPCs), have drawn considerable attention in the fields of physics, chemistry, and biophotonics. Here, experimental results verify the feasibility of a 1DPC working as a substrate for switchable manipulations of colloidal microparticles. The optically induced thermal convective force on a 1DPC can assemble colloidal particles that are dispersed in a water solution, while the photonic scattering force on the same 1DPC caused by propagating evanescent waves can guide these particles. Additionally, in the 1DPC, one internal mode can be excited that has seldom been noticed previously. This mode shows an ability to assemble particles over large areas even when the incident power is low. The assembly and guidance of colloidal particles on the 1DPC are switchable just through tuning the polarization and angle of the incident laser beam. Numerical simulations are carried out, which are consistent with these experimental observations.

中文翻译：

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全介电一维光子晶体上胶体颗粒的可切换组装和引导

称为一维光子晶体（1DPC）的介电多层光子带隙结构在物理，化学和生物光子学领域引起了相当大的关注。在这里，实验结果验证了1DPC用作胶体微粒可切换操作的基质的可行性。1DPC上的光诱导热对流力可以聚集分散在水溶液中的胶体粒子，而在同一1DPC上由传播的van逝波引起的光子散射力可以引导这些粒子。此外，在1DPC中，可以激发一种以前很少注意的内部模式。即使入射功率低，此模式也具有在大面积上聚集粒子的能力。只需调整入射激光束的偏振和角度，即可在1DPC上组装和引导胶体颗粒。进行了数值模拟，与这些实验观察结果一致。