Photon Scanning Tunneling Microscopy and Reflection Scanning Microscopy
The Photon Scanning Tunneling Microscope (PSTM) is the photon analogue to the Electron Scanning Tunneling Microscope (ESTM). It uses the evanescent field due to the total internal reflection (TIR) of a light beam in a prism modulated by a sample attached to the prism. The exponential decay of the evanescent field is characterized by the penetration depth dp and depends on the angle of incidence θ, the wavelength and polarization of the incident beam. Changes in intensity are monitored by a probe tip scanned over the surface, and the data are processed to generate an image of the sample. Images produced by a prototype instrument are shown to have a vertical resolution of about 3 Å and a lateral resolution of about 100 Å.
To image non transparent samples, we have developed the Reflection Scanning Tunneling Microscopy (RSM), a method for producing a point light reflected by the sample. The microscope which uses an optical fiber coupler is easily installed on an existing PSTM.
KeywordsTotal Internal Reflection Decay Length Evanescent Field Transparent Sample Optical Fiber Coupler
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