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提出两种同时满足高分辨、高传光效率的探针模型以及制备方法 :先用自制热拉装置将光纤拉制成过渡区为双曲线或抛物线形的探针 ,然后用 4 0 %氢氟酸进行快速腐蚀 ,使探针孔径变小而保持过渡区域形状和锥度基本不变。所获探针孔径变化范围为 2 0～ 2 0 0 nm,锥度 2 0°～ 6 0°。为检验探针性能 ,将两种探针的出射光分布与用传统热拉法所得到探针进行对比 ;探测了光子扫描隧道显微镜状态下的倏逝波衰减曲线 ;给出了用集光式扫描近场光学显微镜得到的近场光学图像 ;同时 ,验证了探针对剪切力控制的适用性。
Two probe models are proposed to meet the requirements of high resolution and high light transmission efficiency. The preparation method includes the following steps: firstly drawing the optical fiber into a hyperbolic or parabolic probe in a transition zone by a self-made hot drawing device, and then carrying out 40% hydrofluoric acid Rapid corrosion, the probe aperture smaller and keep the transitional area shape and taper is basically the same. The obtained probe aperture ranged from 20 nm to 200 nm with a taper of 20 ° to 60 °. In order to test the performance of the probe, the distribution of the emitted light of the two probes is compared with that of the probe obtained by the conventional hot drawing method; the decay curve of the evanescent wave in the state of the photon scanning tunneling microscope is detected; The near-field optical images obtained by scanning near-field optical microscopy were obtained. At the same time, the probe’s applicability to shear control was verified.