Fourier analysis of photon scanning tunneling microscope

Zhiyang Li; Xiaochun Pan; Wu Liu; Xingjiao Li

doi:10.1117/12.326838

13 October 1998 Fourier analysis of photon scanning tunneling microscope

Zhiyang Li, Xiaochun Pan, Wu Liu, Xingjiao Li

Proceedings Volume 3467, Far- and Near-Field Optics: Physics and Information Processing; (1998) https://doi.org/10.1117/12.326838
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

A Fourier analysis on the imaging process in PSTM has been presented. Analytical expressions for scalar/vector angular spectrum transfer function were derived. As the numerical result shown, the ASTF of a PSTM consists of two distinct components, the propagating component and evanescent component. For evanescent component, their amplitudes decrease dramatically while the phases remain constant as tip-sample distanced increases, which were found responsible for the degrading of the sharpness, contrast and intensity of the image. For propagating component, their phases increase linearly with d while the amplitudes keep constant, which causes distortion and bring blurring to the image. Compared with scalar-ASTF a vector-ASTF spreads out much wider and decreases an order faster as tip aperture diameter decreases. Based on ASTF the influences of such parameters as tip-sample distance, tip aperture diameter and the incident angle of illuminating laser beam on PSTM image has been discussed.

Citation Download Citation

Zhiyang Li, Xiaochun Pan, Wu Liu, and Xingjiao Li "Fourier analysis of photon scanning tunneling microscope", Proc. SPIE 3467, Far- and Near-Field Optics: Physics and Information Processing, (13 October 1998); https://doi.org/10.1117/12.326838

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