Au nanorod–coupled microfiber optical humidity sensors | Zendy

Ning Zhou | Zendy; P. Wang | Zendy; Zhangxing Shi | Zendy; Yixiao Gao | Zendy; Yuxin Yang | Zendy; Y. P. Wang | Zendy; Yu Xie | Zendy; Dawei Cai | Zendy; Xin Guo | Zendy; Lei Zhang | Zendy; Jianrong Qiu | Zendy; Limin Tong | Zendy

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Au 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 , resonance (particle physics) , optoelectronics , relative humidity , micrometer , optical fiber , image resolution , 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.

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