Determination of sub-nanometer distance from reflective surface by Fabry-Perot interferometer
| Autor: | Norbert Tarjányi, Kay Schuster, Ivan Martincek, Daniel Kacik |
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| Rok vydání: | 2018 |
| Předmět: |
Surface (mathematics)
Optical fiber Materials science Physics::Optics General Physics and Astronomy Optical power 02 engineering and technology 01 natural sciences law.invention 010309 optics Optics law 0103 physical sciences business.industry Slight change Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Reflection (physics) Nanometre 0210 nano-technology business Refractive index Fabry–Pérot interferometer |
| Zdroj: | Applied Surface Science. 461:139-142 |
| ISSN: | 0169-4332 |
| Popis: | The method for determination of slight change of an object’s distance from a reflective surface is proposed and experimentally verified. The method is based on interference of light using Fabry-Perot configuration where the first reflection is from the optical fiber end-air interface and the second reflection is from the surface. The evaluation is based on comparison between the reference measurement and the measurement for which we determine the change in distance. The optical power difference (in dB) of two measurements is obtained and for known value of refractive index of the environment between the optical fiber end and the reflective surface, the ratio of intensities of interfering beams and the distance from reflective surface, the change of distance could be determined from comparison of measured and computed dependences. The smallest possible change of the distance to observe by the method is approximately 30 pm. The accuracy of determination of the distance is ±20 pm. |
| Databáze: | OpenAIRE |
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