Photon scanning-tunneling spectroscopy/microscopy
- Oak Ridge National Laboratory, TN (United States); and others
The photon scanning-tunneling microscope (PSTM) utilizes probe-tip induced frustration of the total internal reflection of light in a sample. It is the exact analogue of the electron scanning-tunneling microscope (STM). The PSTM uses a sharpened optical fiber tip rastered across a sample using the same technology and controls as that of the STM. While the spatial resolution is not as fine as that of an STM, the PSTM surpasses the optical diffraction barrier by a factor of five or more, and also obtains nanometer relief resolution while retaining most of the conveniences and methodologies of optical microscopy. More importantly, it can utilize a variety of optical spectroscopies to simultaneously produce typographical chemical maps. The spectroscopic signal acquired within a few nanometers of the surface is vastly greater than would be expected on the basis of traditional far-zone cross section calculations. The PSTM has been used to measure local variations in index of refraction, surface-enhanced Raman signals, fluorescence, stress-induced changes in ion photoluminescence, and birefringement. This paper is a general overview of the current state of PSTM progress, including extension to shorter wavelengths to provide increased resolution.
- OSTI ID:
- 191732
- Report Number(s):
- CONF-941098-; TRN: 95:006733-0088
- Resource Relation:
- Conference: FACSS XXI: 21st annual conference of the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS), St. Louis, MO (United States), 2-7 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of 21st annual conference of the Federation of Analytical Chemistry and Spectroscopy Societies; PB: 257 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photon scanning tunneling microscopy
Ultrafast scanning tunneling microscopy