中文摘要：

摘要：基于电磁场波动理论，对纳米尺度的圆锥形光纤的特征方程进行了求解。通过该理论计算以及利用COMSOLMultiphysics进行模拟，得出了锥形光纤圆柱形部分电场和能量的分布与波长的关系，在截止波长以内能量以基模形式在光纤中传输，而随着波长的增大，能量由纤芯向包层溢出越来越明显。对于光纤的圆锥体部分则得出了在波长一定的情况下，其锥长变化对光纤中能量传输的影响，并得到了在同一锥长下不同截面处的能量分布。

英文摘要：

Based on the electromagnetic wave theory, the eigenvalue equations of nanoscale conical optical fibers are solved. Through the theoretical calculations and simulations using COMSOL muhiphys- ics, the relationship between electric field and energy distribution and wavelength for cylindrical part of tapered optical fiber is obtained. In the scope of the cutoff wavelength the energy is transmitted in optical fiber in the form of fundamental, and as the wavelength increases, it overflows obviously from the core to the cladding. Besides, for the conical portion of optical fiber, the results show that the energy transmis- sion is affected by the cone length under a certain wavelength, and the energy distributions at different cross-sections are also obtained when the cone length is certain.