High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition
| Autor: | Tanoy Kumar Dey, Sankhyabrata Bandyopadhyay, Kamal Dasgupta, Nandini Basumallick, Somnath Bandyopadhyay, Palas Biswas |
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| Rok vydání: | 2016 |
| Předmět: |
All-silica fiber
Mode volume Materials science business.industry 02 engineering and technology Long-period fiber grating 021001 nanoscience & nanotechnology Cladding (fiber optics) Cladding mode 01 natural sciences Graded-index fiber Atomic and Molecular Physics and Optics 010309 optics Optics Fiber Bragg grating 0103 physical sciences Optoelectronics 0210 nano-technology business Step-index profile |
| Zdroj: | Journal of Lightwave Technology. 34:3348-3353 |
| ISSN: | 1558-2213 0733-8724 |
| DOI: | 10.1109/jlt.2016.2563521 |
| Popis: | We report a high sensitive refractive index (RI) sensor using fiber Bragg grating (FBG) where azimuthally symmetric resonant cladding modes were used for RI sensing. We enhanced the sensitivity by tailoring the effective index of a cladding mode to an optimum value so that the mode has maximum sensitivity around a specific surrounding RI. We tailored the effective index of a clad mode by controlled deposition of a thin polymer layer having RI higher than the cladding. Experiments show that the sensitivity of cladding mode (LP0,12) of a standard FBG with overlay coating to the surrounding medium having RI around 1.333 is ∼ 2600 pm/RIU. The proposed sensing mechanism will be useful for biological sensing application. |
| Databáze: | OpenAIRE |
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