Design and optimization of tapered structure of near‐field fibre probe based on finite‐difference time‐domain simulation
Design and optimization of tapered structure of near‐field fibre probe based on finite‐difference time‐domain simulation
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基于时域有限差分模拟的近场光纤探头锥形结构设计与优化
DOI：
10.1046/j.1365-2818.2001.00804.x
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发表时间：
2001
影响因子：
2
通讯作者：
T. Saiki
中科院分区：
文献类型：
--
作者：
H. Nakamura;T. Sato;H. Kambe;K. Sawada;T. Saiki
采用时域有限差分法模拟了光在小金属孔径锥形近场光纤探针中的传播。通过对锥形金属包层波导和连接光纤波导进行大体积模拟，我们说明了这些导向模式之间的耦合以及孔径附近的电场分布。双锥形探针的高收集效率被重现，并归因于截断区域的缩短和光纤导向模式的有效耦合。研究了效率与锥形结构参数的关系。
The finite‐difference time‐domain method was employed to simulate light propagation in tapered near‐field fibre probes with small metal aperture. By conducting large‐volume simulations, including tapered metal‐cladding waveguide and connected optical fibre 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 cut‐off region and the efficient coupling to the guiding mode of the optical fibre. The dependence of the efficiency on the tapered structure parameters was also examined.