Design and optimization of tapered structure of near-field fiber probe based on FDTD simulation
Design and optimization of tapered structure of near-field fiber probe based on FDTD simulation
复制标题
基于FDTD仿真的近场光纤探头锥形结构设计与优化
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Saiki
中科院分区：
文献类型：
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作者：
Hiroaki Nakamura;Tetsuya Sato;H. Kambe;K. Sawada;T. Saiki
采用时域有限差分法模拟了光在具有小金属孔径的锥形近场光纤探针中的传输。通过对锥形金属包层波导和连接光纤波导的大体积模拟，说明了这些导模之间的耦合以及孔径附近的电场分布。再现了双锥形探针的高收集效率，并归因于截止区的缩短和与光纤的导模的有效耦合。还研究了效率对锥形结构参数的依赖性。
The finite-difference time-domain method was employed to simulate light propagation in tapered near-field fiber probes with small metal aperture. By conducting large-volume simulations, including tapered metal-cladding waveguide and connected optical fiber waveguide, we illustrated the coupling between these guiding modes as well as the electric field distribution in the vicinity of the aperture. The high collection efficiency of a double-tapered probe was reproduced and was ascribed to the shortening of the cutoff region and the efficient coupling to the guiding mode of the optical fiber. The dependence of the efficiency on the tapered structure parameters was also examined.