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Item Porous core Photonic Crystal Fiber based chemical sensor(IEEE Xplore, 2017-02-16) Paul, Bikash Kumar; Islam, Md. Shadidul; Chowdhury, Sawrab; Asaduzzaman, Sayed; Ahmed, KawsarIn this paper, a porous core photonic crystal fiber based chemical sensor has been proposed. The cladding of the proposed PCF is hybrid where inner three layers are hexagonal and the outer two layers are circular. The proposed PCF shows higher relative sensitivity and low confinement loss simultaneously. For the investigation of the proposed photonic crystal fiber a full vectorial finite element method (FEM) was used. Geometric parameters like diameters of the holes and pitch are varied to optimize the Proposed PCF. The proposed PCF can be used for detecting the lower index chemical like ethanol which is industrially valuable. Moreover, the proposed PCF can sense the chemicals in a wide range of wavelength from 0.8 μm to 1.9 μm. Full Text Link: http://doi.org/10.1109/ICECE.2016.7853903Item Spiral photonic crystal fiber for gas sensing application(IEEE Xplore, 2017-02-16) Islam, Md. Ibadul; Khatun, Maksuda; Sen, Shuvo; Ahmed, Kawsar; Asaduzzaman, SayedThis paper proposes, the design and characterization of a spiral shape photonic crystal fiber for gas sensing application. The core region of the proposed PCF is oriented with elliptical air holes in a hexagonal shape and the cladding is oriented in a spiral manner. The proposed PCF not only shows high sensitivity but also shows high birefringence as well. The geometrical parameters were altered to fix the optimized structure. By utilizing finite element method (FEM) the numerical analysis of the proposed PCF is performed. Our proposed PCF shows the high sensitivity of 42.27% and high birefringence of 1.94×10 -2 at λ=1.33μm which is the absorption line of toxic gasses like (methane and hydrogen fluoride). Full Text Link: http://doi.org/10.1109/ICECE.2016.7853900Item A comparative analysis of two different PCF structures for gas sensing application(IEEE Xplore, 2016-07-11) Arif, Md. Faizul Huq; Ahmed, Kawsar; Asaduzzaman, SayedToxic or Flammable gases and leakage of the gas lines can be detected by photonic crystal fibers for avoiding pollution, explosion or fire. Two different structures of hollow core based Photonic crystal fiber (HC-PCF) has been presented in this paper. The sensitivity of the proposed structures was numerically investigated by finite element method (FEM) varying the optical and geometrical properties. The numerical results show that the proposed PCF with six air holes shows 2.22 times higher sensitivity than the PCF with eight air holes in the first layer. Both of the PCFs exhibit reduced confinement loss also. The proposed PCFs can sense the lower refractive index based gases (toxic/ flammable) at a wide range of wavelength 0.8 μm to 2μm. Full Text Link: http://doi.org/10.1109/ICAEE.2015.7506842Item Numerical analysis of O-PCF structure for sensing applications with high relative sensitivity(IEEE Xplore, 2016-01-28) Ahmed, Kawsar; Asaduzzaman, Sayed; Arif, Md. Faizul HuqIn this study, micro structured core and cladding based O-PCF has been analyzed by its propagation characteristics. The effects of pitch variation, total power consumption and effective refractive index are investigated on O-PCF. The analyzing process takes place by the full vectorial finite element method (FEM). The analysis O-PCF contains five layers of the air holes in octagonal shape which increases relative sensitivity significantly and decreases confinement loss than the prior structures. Beyond that, the analysis O-PCF can sense the three chemicals water, Ethanol and Benzene at a wide range of wavelength. Full Text Link: http://doi.org/10.1109/EICT.2015.7391956Item Proposal of simple gas sensor based on micro structure optical fiber(IEEE Xplore, 2015-10-29) Morshed, Monir; Asaduzzaman, Sayed; Arif, Md. Faizul Huq; Ahmed, KawsarThis paper presents a simple structure of photonic crystal fiber (PCF) based gas sensors. Gas sensors can be used in gas production facilities for safe measurement. The index guiding properties of two rings circular PCF have been analysed for different wavelength with the variation of the diameters of air holes in core and cladding. Finite-element method has been applied for numerical analysis. At the wavelength λ=1.66μm obtained maximum sensitivity is 13.94% and at the same time the confinement loss of the fiber is 2.74×10 -4 dB/m. The proposed structure is more flexible for its high sensitivity, low confinement loss and simple structure compare to early proposed high sensitivity chemical sensor PCFs with a hollow high index ring defect at the centre. Full Text Link: http://doi.org/10.1109/ICEEICT.2015.7307400