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11 November 2008 Optical resonance analysis of reflected long period fiber gratings with metal film overlay
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Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 713438 (2008) https://doi.org/10.1117/12.803506
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China
Abstract
We present the experimental results of a novel single-ended reflecting surface plasma resonance (SPR) based long period fiber grating (LPFG) sensor. A long period fiber grating sensing device is properly designed and fabricated with a pulsed CO2 laser writing system. Different nm-thick thin metal films are deposited on the fiber cladding and the fiber end facet for the excitation of surface plasma waves (SPWs) and the reflection of the transmission spectrum of the LPFG with doubled interaction between metal-dielectric interfaces of the fiber to enhance the SPW of the all-fiber SPR-LPFG sensing system. Different thin metal films with different thicknesses are investigated. The effect of the excited SPW transmission along the fiber cladding-metal interface with silver and aluminum films is observed. It is found that different thicknesses of the metal overlay show different resonant behaviors in terms of resonance peak situation, bandwidth and energy loss. Within a certain range, thinner metal film shows narrower bandwidth and deeper peak loss.
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Guiju Zhang, Bing Cao, Chinua Wang, and Minfu Zhao "Optical resonance analysis of reflected long period fiber gratings with metal film overlay", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 713438 (11 November 2008); https://doi.org/10.1117/12.803506
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