Liu Cheng-Yang, Hsiao Kai-Lung
Opt Lett. 2015 Nov 15;40(22):5303-6. doi: 10.1364/OL.40.005303.
We first experimentally evaluate the direct imaging of photonic nanojets from core-shell microcylinders. The optimal photonic nanojet with long length, a high intensity spot, and low divergence is observed at the designed gold-silver-coating microcylinder. A special microcylinder consists of multilayered metallic shells (gold, silver, and copper) and a dielectric core (polydimethylsiloxane) at a diameter of 5 μm and a height of 6 μm. The electromagnetic distributions inside and outside the core-shell microcylinders are calculated by using the finite-difference time-domain method. The direct-imaging measurements for photonic nanojets are performed with a scanning-optical-microscope system. Such core-shell microcylinders provide new pathways for high-resolution optical imaging, which are useful for biophotonics, plasmonics, and optical data storage.
我们首先通过实验评估了来自核壳微圆柱的光子纳米射流的直接成像。在设计的金银涂层微圆柱上观察到了具有长长度、高强度光斑和低发散度的最佳光子纳米射流。一种特殊的微圆柱由多层金属壳（金、银和铜）和一个直径为5μm、高度为6μm的介电芯（聚二甲基硅氧烷）组成。使用时域有限差分法计算核壳微圆柱内外的电磁分布。利用扫描光学显微镜系统对光子纳米射流进行直接成像测量。这种核壳微圆柱为高分辨率光学成像提供了新途径，对生物光子学、等离子体学和光学数据存储很有用。
