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Signal of microstrip scanning near-field optical microscope in far- and near-field zones
- Source :
- Applied optics. 55(13)
- Publication Year :
- 2016
-
Abstract
- An analytical model of interference between an electromagnetic field of fundamental quasi-TM(EH)00-mode and an electromagnetic field of background radiation at the apex of a near-field probe based on an optical plasmon microstrip line (microstrip probe) has been proposed. The condition of the occurrence of electromagnetic energy reverse flux at the apex of the microstrip probe was obtained. It has been shown that the nature of the interference depends on the length of the probe. Numerical simulation of the sample scanning process was conducted in illumination-reflection and illumination-collection modes. Results of numerical simulation have shown that interference affects the scanning signal in both modes. However, in illumination-collection mode (pure near-field mode), the signal shape and its polarity are practically insensible to probe length change; only signal amplitude (contrast) is slightly changed. However, changing the probe length strongly affects the signal amplitude and shape in the illumination-reflection mode (the signal formed in the far-field zone). Thus, we can conclude that even small background radiation can significantly influence the signal in the far-field zone and has practically no influence on a pure near-field signal.
- Subjects :
- Electromagnetic field
Physics
business.industry
Materials Science (miscellaneous)
Near and far field
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Electromagnetic radiation
Signal
Industrial and Manufacturing Engineering
Microstrip
010309 optics
Optics
Electric field
0103 physical sciences
Near-field scanning optical microscope
Business and International Management
Reflection coefficient
0210 nano-technology
business
Subjects
Details
- ISSN :
- 15394522
- Volume :
- 55
- Issue :
- 13
- Database :
- OpenAIRE
- Journal :
- Applied optics
- Accession number :
- edsair.doi.dedup.....74e4b073624cc9a32f9cfc5529832a54