4.6 Article

High Sensitivity Photonic Crystal Fiber Refractive Index Sensor with Gold Coated Externally Based on Surface Plasmon Resonance

Journal

MICROMACHINES
Volume 9, Issue 12, Pages -

Publisher

MDPI
DOI: 10.3390/mi9120640

Keywords

Photonic crystal fiber; surface plasmon resonance; refractive index; sensor; finite element method

Funding

  1. National Natural Science Foundation of China [61475134, 61775032, 11604042]
  2. Fundamental Research Funds for the Central Universities [N170405007, N160404009]
  3. JSPS KAKENHI [15H02250]
  4. 111 project [B1009]

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In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU-1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.

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