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Open AccessFeature PaperArticle

Long Period Grating-Based Fiber Coupling to WGM Microresonators

1
Institute of Applied Physics “Nello Carrara” (IFAC), National Research Council of Italy (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze, Italy
2
Department of Electrical and Information Engineering, Polytechnic University of Bari, 70125 Bari, Italy
*
Author to whom correspondence should be addressed.
The authors contributed equally to this work.
Micromachines 2018, 9(7), 366; https://doi.org/10.3390/mi9070366
Received: 29 June 2018 / Revised: 17 July 2018 / Accepted: 20 July 2018 / Published: 23 July 2018
(This article belongs to the Special Issue Glassy Materials Based Microdevices)
A comprehensive model for designing robust all-in-fiber microresonator-based optical sensing setups is illustrated. The investigated all-in-fiber setups allow light to selectively excite high-Q whispering gallery modes (WGMs) into optical microresonators, thanks to a pair of identical long period gratings (LPGs) written in the same optical fiber. Microspheres and microbubbles are used as microresonators and evanescently side-coupled to a thick fiber taper, with a waist diameter of about 18 µm, in between the two LPGs. The model is validated by comparing the simulated results with the experimental data. A good agreement between the simulated and experimental results is obtained. The model is general and by exploiting the refractive index and/or absorption characteristics at suitable wavelengths, the sensing of several substances or pollutants can be predicted. View Full-Text
Keywords: microresonator; whispering gallery mode; long period grating; fiber coupling; distributed sensing; chemical/biological sensing microresonator; whispering gallery mode; long period grating; fiber coupling; distributed sensing; chemical/biological sensing
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Chiavaioli, F.; Laneve, D.; Farnesi, D.; Falconi, M.C.; Nunzi Conti, G.; Baldini, F.; Prudenzano, F. Long Period Grating-Based Fiber Coupling to WGM Microresonators. Micromachines 2018, 9, 366.

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