摘要
提出了一种新的入射波设置"三波法",即将光子扫描隧道显微镜(PSTM)系统中的入射波、全内反射波和透射的隐失波同时设置为时域有限差分(FDTD)计算区域的入射源,克服了PSTM中应用FDTD所遇到的存在样品台(分层界面)和全内反射等困难。给出了PSTM中探针针尖与样品相互作用和光子隧穿的物理图像。模拟了PSTM探针等高扫描过程。给出了PSTM图像,比较了单光束照射与π对称照射等高度扫描曲线的不同,前者有一定的偏移,后者可纠正偏移。
It was developed that finite-difference time-domain (FDTD) method is applied to photon scanning tunneling microscope (PSTM). A novel three-wave method in specifying the incident wave throughout the problem space in PSTM, which includes the incident wave, reflective wave and transmitted evanescent wave, was proposed. The difficulty that there are the substrate and total internal reflection wave in the problem space was solved by applying FDTD in PSTM. We show the physical pictures about the interaction between the probe tip and sample and photon tunneling effect in PSTM. And we simulated the scanning process when the probe tip scan above the sample in constant-height mode. The images of PSTM were presented. At last, we compared the scanning curves in constant-height mode in the condition of single light beam and two light beams illuminated respectively, and the former has some shift, the latter the shift can be corrected.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2004年第3期275-278,共4页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60007011)
