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Articles by J. Ju
Total Records ( 2 ) for J. Ju
  Y.L. Hoo , W. Jin , L. Xiao , J. Ju and H.L. Ho
  Refractive index (RI) sensing based on the anti-guiding property of a depressed-index core photonic crystal fiber (PCF) is studied. A new type of RI sensor is formed by adding a hole to the core of a conventional index guiding PCF for the purpose of measurand filling and the depressed-index core formation. The dependencies of measurement resolution and dynamic range on the structural parameters of the RI sensor are investigated. RI sensors filled with the measurand covering a refractive index range from 1.328 to 1.445 are numerically simulated. Simulation results show that the measurement resolution from 9.32 x 10–7 to 1.23 x 10–7 can be achieved by means of wavelength measurement with an optical spectrum analyzer with 0.01 nm resolution. Also, problem caused by the existence of the photonic bandgap (PBG) mode which may influence the feasibility of the RI sensing mechanism is considered.
  Y.L. Hoo , W. Jin , J. Ju and H.L. Ho
  A depressed-index core photonic crystal fiber (PCF) was numerically analyzed for gas sensing application. The dependence of relative sensitivity, effective mode area, confinement loss, and bend loss on the fiber parameters as well as wavelength are investigated. Lowering the refractive index of core reduces the index contrast between the core and the cladding weakens the index-guidance of the fiber, and enhances the relative sensitivity and the mode area simultaneously. Relative sensitivity and effective mode area increase with the cladding background index, especially in the short wavelength region, which are opposite to that in a conventional PCF. The enhancements of the relative sensitivity and the normalized effective mode area are more than 3700% (from 0.0065 to 0.25) and 680% (from 3.85 to 30), respectively, as compared with that of the non-depressed-index core PCF.
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