Third-order optical nonlinearity in Ge-Se-Te chalcogenide glasses

Yang, Zhen; Hu, Haonan; Li, Qiuli; Zhang, Zheng; Niu, Lei; Wu, Jian; Wei, Tengxiu; Sun, Yuanhuan; Fang, Yiming; Wang, Xunsi; Yang, Zhiyong; Zhou, Jinfeng; Wang, Rongping

doi:10.1016/j.optmat.2021.111208

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…[17] Furthermore, due to their limited transmission range, silica fiber sensors are powerless in the mid-infrared (MIR) range, which contains many important molecular spectral fingerprints. [18] Chalcogenide glasses (ChGs) are novel infrared (IR) optical materials with excellent infrared optical properties, such as a wide IR transmission range, [19] high linear and nonlinear refractive indices [20][21][22] and low phonon energy, [23] and ChG fibers are thus widely used in fiber lasers and biological and chemical sensors in the MIR range. [24][25][26][27] However, due to the high refractive index of chalcogenide glass fiber (usually exceeding 2.0), its sensitivity is limited for conventional liquid detection.…”

Section: Introductionmentioning

confidence: 99%

Design of a coated thinly clad chalcogenide long-period fiber grating refractive index sensor based on dual-peak resonance near the phase matching turning point

Qi¹,

Li²,

Liu³

et al. 2023

Chinese Phys. B

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A novel design method of chalcogenide long-period fiber grating (LPFG) sensor based on the dual-peak resonance effect of LPFG near the phase matching turning point (PMTP) is presented. The refractive index sensing in high refractive index chalcogenide fiber was achieved by a coated thin-cladding film. The dual-peak resonant characteristics near PMTP and refractive index sensing properties of LPFG are analyzed first by the phase-matching condition of LPFG. The effects of film parameters and cladding radius on the sensitivity of refractive index are further discussed. The sensor is optimized by selecting appropriate film parameters and cladding radius. Simulation results show that the ambient refractive index sensitivity of dual-peak coated thin-cladding chalcogenide LPFG at the PMTP can be 2400 nm/RIU, which is significantly higher than that of non-optimized gratings. It has great application potential in the field of chemical and biosensor.

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