A novel design is proposed for highly sensitive surface-plasmon-resonance sensors.The sensor is based on a microstructured optical fiber with two layers of annular-shaped holes.A gold layer is deposited on the inner surface of the second hole-layer,in which the holes have several micrometers thickness in size,facilitating analyte infiltration and metal layer deposition.In the first layer of holes,the sector-ring-shaped arms,used as supporting strips,are utilized to tune the resonance depth of the sensor.Numerical results indicate that the sensor operation wavelength can be tuned across the C+L-band.The spectral sensitivity of 1.0·104nm·RIU-1order of magnitude and a detection limit of 1.0·10-4RIU order are demonstrated over a wide range of analyte refractive index from 1.320 to 1.335.
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