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    Detection of Salmonella bacterium in drinking water using microring resonator
    (2016-01-01)
    Bahadoran, Mahdi
    ;
    Noorden, Ahmad Fakhrurrazi Ahmad
    ;
    Mohajer, Faeze Sadat
    ;
    Abd Mubin, Mohamad Helmi
    ;
    Chaudhary, Kashif
    A new microring resonator system is proposed for the detection of the Salmonella bacterium in drinking water, which is made up of SiO<inf>2</inf>-TiO<inf>2</inf> waveguide embedded inside thin film layer of the flagellin. The change in refractive index due to the binding of the Salmonella bacterium with flagellin layer causes a shift in the output signal wavelength and the variation in through and drop port's intensities, which leads to the detection of Salmonella bacterium in drinking water. The sensitivity of proposed sensor for detecting of Salmonella bacterium in water solution is 149 nm/RIU and the limit of detection is 7 × 10<sup>-4</sup>RIU.
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    Fringe patterns generated by micro-optical sensors for pattern recognition
    (2015-01-01)
    Tamee, Kreangsak
    ;
    Chaiwong, Khomyuth
    ;
    Yothapakdee, Kriengsak
    ;
    Yupapin, Preecha P.
    We present a new result of pattern recognition generation scheme using a small-scale optical muscle sensing system, which consisted of an optical add-drop filter incorporating two nonlinear optical side ring resonators. When light from laser source enters into the system, the device is stimulated by an external physical parameter that introduces a change in the phase of light propagation within the sensing device, which can be formed by the interference fringe patterns. Results obtained have shown that the fringe patterns can be used to form the relationship between signal patterns and fringe pattern recognitions.