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Enhancement of the weak scattered signal in apertureless near-field scanning infrared microscopy.
- Source :
-
Review of Scientific Instruments . Aug2003, Vol. 74 Issue 8, p3670. 5p. - Publication Year :
- 2003
-
Abstract
- An interferometric method is used to enhance the weak scattered signal in apertureless near-field scanning infrared microscopy. The method involves introducing a homodyning reference field, and amplifies the desired signal field by the magnitude of the reference field. This method markedly improves the signal-to-noise ratio of the detected signal, over the nonhomodyned experiment. A model for the dependence of the near-field signal, as a function of the normal distance of the tip from the surface, is discussed. Application of a model in which the tip is represented by two spherical scatterers, one large and one small, indicates the electromagnetic field enhancement is 90-fold greater at the sharp apex of the metallic probe tip. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MICROSCOPY
*INTERFEROMETRY
*ELECTROMAGNETIC fields
*METALS
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 74
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 10342402
- Full Text :
- https://doi.org/10.1063/1.1592876