Abstract

In this work, we demonstrate a refractometric fiber sensor with improved sensitivity for refractive indices ranging from 1.3629 to 1.4479. The device relies on the coupling between a long period grating (LPG) transducer and a localized surface plasmon resonance (LSPR). Sensor operation is based on the transference of energy from LPG cladding modes at the visible spectral range to the LSPR. The transducer consists of a long period grating 3.15-mm-long covered with 2–7 nm gold nanoparticles. The sensor is intensity coded at a 568 nm wavelength, presenting sensitivity of 208%/unit of refractive index for a refractive index of 1.39 and resolution better than 0.0003 for the dynamic range of refractive indices from 1.3629 to 1.4479.

© 2015 Optical Society of America

Matching long-period grating modes and localized plasmon resonances: effect on the sensitivity of the grating to the surrounding refractive index

Bárbara Rutyna Heidemann, Júlia De Carvalho Pereira, Ismael Chiamenti, Marcela Mohallem Oliveira, Marcia Muller, and José Luís Fabris
Appl. Opt. 55(32) 8979-8985 (2016)

Near-infrared grating-assisted SPR optical fiber sensors: design rules for ultimate refractometric sensitivity

Christophe Caucheteur, Valérie Voisin, and Jacques Albert
Opt. Express 23(3) 2918-2932 (2015)

Experimental studies on the sensitivity of the propagating and localized surface plasmon resonance-based tapered fiber optic refractive index sensors

Vivek Semwal and Banshi D. Gupta
Appl. Opt. 58(15) 4149-4156 (2019)

Highly sensitive dual-core photonic crystal fiber based on a surface plasmon resonance sensor with a silver nano-continuous grating

Shengxi Jiao, Sanfeng Gu, Hanrui Yang, Hairui Fang, and Shibo Xu
Appl. Opt. 57(28) 8350-8358 (2018)

Tapered optical fiber sensor based on localized surface plasmon resonance

Hsing-Ying Lin, Chen-Han Huang, Gia-Ling Cheng, Nan-Kuang Chen, and Hsiang-Chen Chui
Opt. Express 20(19) 21693-21701 (2012)