Multimode Optical Fiber Sensor Modified with Gold Nanorod Arrays

Haibin Ni, Xuzhi Gao, Jun Tian,Tong Cai, Yi Shen,Bo Ni,Jianhua Chang

IEEE Photonics Technology Letters（2024）SCI 3区

Nanjing University of Information Science and Technology

Cited 0|Views5

Abstract

This letter presents the design and fabrication of a multimode fiber sensor, enhanced with a gold nanorod (GNR) array to improve its refractive index sensitivity. The cladding is etched with hydrofluoric acid (HF) to allow light leakage from the core, followed by magnetron sputtering of a 40 nm thick silver film onto the fiber surface. Subsequently, a GNR array, prepared using the anodic aluminum oxide (AAO) template method, is transferred onto the silver film. Compared to sensors with only a silver film on the fiber, the sensor with the GNR array exhibited a 31.85% increase in refractive index sensitivity. Furthermore, the GNR on the sensor was coated with the humidity-sensitive material polyvinyl alcohol (PVA) to measure environmental relative humidity. The results indicate that the surface plasmon resonance (SPR) peak wavelength shift has a strong linear correlation with relative humidity within the range of 30-80% RH, achieving a sensitivity of 0.431 nm/%RH.

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Key words

Gold nanorod arrays,optical fiber sensing,relative humidity,surface plasmon resonance,sensitivity

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