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尝试用时域有限差分法(FDTD)分析采用不同探针时光子扫描隧道显微镜(PSTM)成像的分辨率和效率。对四种探针,即不镀膜,带菱形金尖,镀金膜有孔径,镀金膜无孔径的探针,用二维p极化波,满足全反射条件,并用样品台上方平行于界面的隐失波作为等效入射波源,用探针距离尖顶一定高度截面的玻印亭矢量计算散射场强。数值模拟结果表明,带纳米尺度金尖的探针具有最好成像的分辨率和效率,镀膜无孔径和镀膜孔径探针次之,不镀膜探针最差。
Attempts to analyze the resolution and efficiency of photomicroscope tunneling microscopy (PSTM) imaging with different probes using time-domain finite-difference method (FDTD). The four probes, ie, uncoated, diamond-shaped gold tips, gold-plated films with apertures, gold-plated films without apertures, use two-dimensional p-polarized waves to meet the total reflection condition and parallel to the interface with the sample stage The loss wave is regarded as the equivalent incident wave source, and the scattering field strength is calculated by the Bollinger vector with the probe at a certain height from the apex. The numerical simulation results show that the probe with nanometer-scale gold tip has the best imaging resolution and efficiency, the non-aperture of the coating and the probe of the coated aperture are the second, and the uncoated probe is the worst.