Abstract
A large-mode-area polymer photonic crystal fiber made of polymethyl methacrylate with the cladding having only one layer of air holes near the edge of the fiber is designed and proposed to be used in surface plasmon resonance sensors. In such sensor, a nanoscale metal film and analyte can be deposited on the outer side of the fiber instead of coating or filling in the holes of the conventional PCF, which make the real time detection with high sensitivity easily to realize. Moreover, it is relatively stable to changes of the amount and the diameter of air holes, which is very beneficial for sensor fabrication and sensing applications. Numerical simulation results show that under the conditions of the similar spectral and intensity sensitivity of 8.3 × 10−5–9.4 × 10−5 RIU, the confinement loss can be increased dramatically.
Highlights
Surface Plasmon Resonance (SPR) is a powerful direct sensing technique
Surface plasmon resonance sensors based on this kind of photonic crystal fiber have been analyzed though the finite element method (FEM), regularity of the resonant wavelength changing with refractive index of the sample has been numerically simulated, and resonant wavelength detection as well as intensity detection sensitivity have been discussed
Introduction of More Air Holes into the polymethyl methacrylate (PMMA) Photonic Crystal Fiber-Based of 125 μm Diameter
Summary
Surface Plasmon Resonance (SPR) is a powerful direct sensing technique. SPR-based sensing methods are currently considered to be the most advanced real-time and label-free detection technology. Surface plasmon resonance sensors based on this kind of photonic crystal fiber have been analyzed though the finite element method (FEM), regularity of the resonant wavelength changing with refractive index of the sample has been numerically simulated, and resonant wavelength detection as well as intensity detection sensitivity have been discussed. Decreased the diameter of the fiber core to 125 μm and introduced more air holes in the core of the PCF, the calculation results show that the improved structure obtains higher transmission losses with similar sensitivity Both the fabrication of the sensor and the detection process are expected to be simplified
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