Abstract
A geometrically structural parameters insensitive hollow-core photonic crystal fiber sensor has been researched to detect the concentration of the water–ethanol solution. Using the full-vector finite-element method, we have obtained the effective refractive index of the guided mode LP01 in the fiber based on surface plasmon resonance and the anisotropic perfectly matched layer boundary condition. The high-order plasmon mode LP11 is excited at the adjacent ethanol solution and is sensitive to the change of the concentration. Through simulating transmission spectrum of the sensor, we obtain that the spectral sensitivity does not approximately change when the thickness of the silver film $h$ , the air-holes diameter $d$ , and the large air-hole diameter $D$ increase, respectively. The spectral sensitivity of the sensor can be about 1.15 nm/% with ${h} =50$ nm, $\Lambda = 2.8\,\,\mu \text{m}$ , ${D}= 2.2\Lambda $ , and ${d} = 0.5\Lambda $ .
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