Au nanorod–coupled microfiber optical humidity sensors

N. Zhou, P. Wang, Z. X. Shi, Y. X. Gao, Y. X. Yang, Y. P. Wang, Y. Xie, D. W. Cai, X. Guo, L. Zhang, J. R. Qiu, L. M. Tong

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Abstract

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.
Original languageEnglish
Article number356169
Pages (from-to)8180-8185
Number of pages6
JournalOPTICS EXPRESS
Volume27
Issue number6
DOIs
Publication statusPublished - 6 Mar 2019

Keywords

  • CCD cameras
  • Fiber optic sensors
  • Light matter interactions
  • Optical sensing
  • Scanning electron microscopy
  • Spatial resolution

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