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利用局部模耦合模型理论上分析了扫描近场光学显微镜光纤锥的光场性质，给出光纤锥中存在的正、反向传播的基模场微分方程，以及基模反向耦合系数的数值计算结果，其最高反射系数达１％左右。这种反射光可起着光纤锥激光器谐振腔输出端镜的作用。另外，抛物型光纤锥探针的反向耦合系数比截锥型的低。并给出光纤锥中光波逆向反射的实验结果。
The local mode coupling model is used to theoretically analyze the optical field properties of the fiber cone in a scanning near-field optical microscope. The forward and backward fundamental mode field differential equations existing in the fiber cone and the numerical calculation of the fundamental coupling back-coupling coefficient As a result, the highest reflection coefficient of about 1%. This reflected light can act as a fiber cone resonator resonator output end mirror. In addition, the parabolic optical fiber probe has a lower reverse coupling coefficient than the truncated cone. The experimental results of the retroreflection of optical wave in fiber cone are given.