Open AccessAu nanorod–coupled microfiber optical humidity sensors
Author(s) -
Ning Zhou,
P. Wang,
Zhangxing Shi,
Yixiao Gao,
Yuxin Yang,
Y. P. Wang,
Yu Xie,
Dawei Cai,
Xin Guo,
Lei Zhang,
Jianrong Qiu,
Limin Tong
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.008180
Subject(s) - microfiber , materials science , nanorod , optics , surface plasmon resonance , whispering gallery wave , micrometer , resonance (particle physics) , optoelectronics , relative humidity , optical fiber , nanotechnology , nanoparticle , resonator , physics , composite material , particle physics , thermodynamics
We demonstrate a high-sensitivity relative humidity (RH) sensor taking advantage of single-band narrow plasmon resonance of a single Au nanorod coupled to a whispering gallery cavity mode of a polyacrylamide microfiber. From the resonance peak shift, the sensor could achieve a sensitivity up to 0.51 nm/% RH with a cavity size of about 2 μm. By coupling multiple Au nanorods along the microfiber axis, we demonstrate a position-dependent microfiber optical humidity sensor with a 1.5-mm spatial resolution, which can be potentially reduced to micrometer level, paving a way toward high-resolution distributed microfiber optical sensors.