Micro-Deformed Looped Fiber Taper With High Sensitivity to Refractive Index
| Autor: | D. Toral-Acosta, J.A. Guerrero-Viramontes, G. Anzueto-Sánchez, L. F. Enriquez-Gomez, Romeo Selvas-Aguilar, Teresa Elena Porraz-Culebro, Kenia Madrazo de la Rosa, G. Salceda-Delgado, Alejandro Martinez-Rios |
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| Rok vydání: | 2020 |
| Předmět: |
Optical fiber
Materials science business.industry Heat pulse Bent molecular geometry Physics::Optics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Loop (topology) Section (fiber bundle) Optics law Physics::Accelerator Physics Fiber Sensitivity (control systems) Electrical and Electronic Engineering business Refractive index |
| Zdroj: | IEEE Photonics Technology Letters. 32:93-96 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2019.2958270 |
| Popis: | We report a highly sensitive refractive index sensor based on a looped micro-deformed tapered fiber. The micro-deformation is induced by first shaping the taper into a loop, and then, a ball-shaped fiber end bends the taper waist. While the tapered fiber loop is bent, a heat pulse from a CO2-laser is applied for 2 seconds, just enough to avoid the fusion with the balled fiber end. In this way, a small section of the taper’s waist is permanently micro-deformed. The micro-deformation has a semicircular shape with a size determined by the diameter of the balled fiber end. The micro-deformation dramatically enhances the sensitivity of the tapered fiber loop to changes in the external refractive index. Refractive index sensitivities of 1052 nm/RIU and 1636 nm/RIU were obtained with micro-deformation diameters of $220~\mu \text{m}$ and $570~\mu \text{m}$ , in a refractive index range from 1.3 to 1.345, and 1.3 to 1.34, respectively. The high sensitivity of the proposed device in the above mentioned refractive index range is attractive for biological and chemical sensing in water-based solutions. |
| Databáze: | OpenAIRE |
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