Dual-Core Fiber-Based Interferometer for Detection of Gas Refractive Index
| Autor: | Qianqing Yu, Heng Wang, Zhenggang Lian, Hang Qu, Zicheng Yang, Meifan He, Xuehao Hu, Haijin Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Applied optics. Photonics
Fabrication Materials science interferometer Physics::Optics 02 engineering and technology fiber optics sensors Interference (wave propagation) 01 natural sciences law.invention 010309 optics Optics law 0103 physical sciences Radiology Nuclear Medicine and imaging Fiber Instrumentation microstructured fibers business.industry Resolution (electron density) lcsh:TA1501-1820 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Photodiode Core (optical fiber) Interferometry 0210 nano-technology business Refractive index |
| Zdroj: | Photonics, Vol 7, Iss 111, p 111 (2020) |
| ISSN: | 2304-6732 |
| Popis: | We demonstrate a dual-core fiber-based Mach–Zehnder interferometer that could be used for precise detection of variations in refractive indices of gaseous samples. The fiber used here have a solid germanium-doped silica core and an air core that allows gases to flow through. Coherent laser beams are coupled to the two cores, respectively, and thus excite guiding modes thereby. Interferogram would be produced as the light transmitted from the dual cores interferes. Variations in refractive index of the hollow core lead to variations in phase difference between the modes in the two cores, thus shifting the interference fringes. The fringe shifts can be then interrogated by a photodiode together with a narrow slit in front. The resolution of the sensor was found to be ~1 × 10−8 RIU, that is comparable to the highest resolution obtained by other fiber sensors reported in previous literatures. Other advantages of our sensor include very low cost, high sensitivity, straightforward sensing mechanism, and ease of fabrication. |
| Databáze: | OpenAIRE |
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