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中文摘要：
利用时域有限差分（FDTD）方法数值演示了一种能光学引导和聚焦激光的锥形空心银波导,数值模拟结果表明这种锥形空心银波导能把激光聚焦成一个极小的、直径只有1μm、强度高度局域性的光斑.对锥形波导能光学引导和聚焦激光的物理机理作了分析和探索,并进一步探讨了激光倾斜入射、波导几何结构对锥形波导聚焦特性造成的影响,这些研究结果对于锥形光学的应用、快点火或产生高能带电粒子中锥靶结构的最佳设计具有重要的参考价值.
英文摘要：
We numerically demonstrate a kind of tapered hollow silver waveguide for optically guiding and focusing of light through finite-difference time-domain （FDTD） simulations. The results of numerical simulation reveal that the tapered hollow silver waveguide can efficiently guide and focus a laser light to a tiny,highly localized beam spot of 1 μm diameter. The physical mechanism of the cone-focused laser light is explored. The influence of incident angle and waveguide geometry on the focusing properties is also discussed. The results obtained here might have important reference value for applications in tapered optics,and designing the optimum cone shape for fast ignition and generating high energy charged particles.
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