采用局域模式耦合理论，对扫描近场光学显微镜（ＳＮＯＭ）中的两类光纤探针——腐蚀锥和熔拉锥的传输特性进行了比较和分析。给出了光在探针锥中传输时耦合效率的分布情况，以及传输效率随锥长、针尖直径和光波长变化的特性 The local mode coupling theory was used to compare and analyze the transmission characteristics of two types of fiber probes - the corrosion cone and the melt taper in the near field optical microscope (SNOM). The distribution of coupling efficiency when light is transmitted in the probe cone is given, and the transmission efficiency varies with the length of the cone, the diameter of the tip and the wavelength of the light