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6 December 2011 Functional photonic crystal fiber sensing devices
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Proceedings Volume 8307, Passive Components and Fiber-Based Devices VIII; 83071E (2011)
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China
We report on a functional, highly reproducible and cost effective sensing platform based on photonic crystal fibers (PCFs). The platform consists of a centimeter-length segment of an index-guiding PCF fusion spliced to standard single mode fibers (SMFs). The voids of the PCF are intentionally sealed over an adequate length in the PCF-SMF interfaces. A microscopic collapsed region in the PCF induces a mode field mismatch which combined with the axial symmetry of the structure allow the efficient excitation and recombination or overlapping of azimuthal symmetric modes in the PCF. The transmission or reflection spectrum of the devices exhibits a high-visibility interference pattern or a single, profound and narrow notch. The interference pattern or the notch position shifts when the length of the PCF experiences microelongations or when liquids or coatings are present on the PCF surface. Thus, the platform here proposed can be useful for sensing diverse parameters such as strain, vibration, pressure, humidity, refractive index, gases, etc. Unlike other PCF-based sensing platforms the multiplexing of the devices here proposed is simple for which it is possible to implement PCF-based sensor arrays or networks.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joel Villatoro, Vittoria Finazzi, and Valerio Pruneri "Functional photonic crystal fiber sensing devices", Proc. SPIE 8307, Passive Components and Fiber-Based Devices VIII, 83071E (6 December 2011);

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