A quasi-D-Shaped photonic crystal fiber plasmonic sensor with rectangular lattice is proposed by using Au as plasmonic layer and graphene to enhance the sensing performance. By moving the core to the edge of the fiber, a shorter polishing depth is achieved which makes the fiber proposed has greater mechanical strength than other common D-shaped fiber. Benefited from the natural advantage of rectangular lattice, the dual sensing channels makes the proposed sensor shows a maximum wavelength interrogation sensitivity of 3877nm/RIU with the dynamic refractive index range from 1.33 to 1.42 and a maximum amplitude sensitivity of 1236RIU−1 with the analyte RI=1.41 in the visible region. The corresponding resolution are 2.58×10−5 and 8.1×10−6 with the methods of wavelength interrogation method and amplitude-(or phase-) based method. These advantages make the proposed sensor a competitive candidate for biosensing in the field of refractive index detection such as water quality analysis, clinical medicine detection, and pharmaceutical testing.
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