Browsing by Author "S. Mitatha"

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    All-optical logic and and or gates generated by dark-bright soliton conversion
    (2013) P. Phongsanam; C. Teeka; R. Jomtarak; S. Mitatha; P.P. Yupapin; P.P. Yupapin; Advanced Research Center for Photonics, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; email: kypreech@kmitl.ac.th
    In this paper, a novel system of simultaneous optical logic AND and OR gates using dark-bright soliton conversion within the add/drop optical filter system is proposed. By using the dark-bright soliton conversion concept, the switching output signal response time of ns can be obtained. The input logic '0' and control logic '0' are formed by using the dark soliton pulse (D) trains. We found that the simultaneous optical logic AND and OR gates at the drop and through ports can be formed, respectively. The comparison data of the commercial system is also given, which is shown that the proposed system has the advantage over the commercial ones. © 2012 Elsevier GmbH. All rights reserved.
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    Soliton spin manipulation using an optical add-drop filter
    (2012) S. Mitatha; S. Glomglome; C. Teeka; P.P. Yupapin; P.P. Yupapin; Nanoscale Science and Engineering Research Alliance (n'Sera), Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; email: kypreech@kmitl.ac.th
    By using the optical add-drop filter which is formed by a microring resonator.After a dark soliton pulse is fed into an input port of the add-drop filter, the orthogonal soliton pair (dark and bright solitons) can be formed within the system and detected simultaneously at the output ports. Under the resonant condition, the conversion of dark and bright solitons corresponding to the left-hand and right hand soliton orientations can be generated and seen. Whenever a soliton(photon) is absorbed by an object, an angular momentum of either +h or -h is imparted to the object, in which two possible soliton states known as soliton spins are exhibited and confirmed by the helical phase presentation. In application, the train of orthogonal solitons, that is, many solitons (photons) with slightly different wavelengths can be generated by using the modified add-drop filter, which is available for many soliton spin investigations. © 2012 Wiley Periodicals, Inc.
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    Spin-polarization array generation for spin transport use
    (2011) S. Mitatha; W. Sangiamsak; K. Kulsirirat; C. Teeka; P.P. Yupapin
    Spin-polarization can be formed by the two components of soliton (electromagnetic wave) within the metallic waveguide. Under the resonant condition, the random transverse electric and magnetic fields of the solitons corresponding to the left-hand and right hand photons can be generated. Whenever a photon is absorbed by an object, an angular momentum of either +_ or -_ is imparted to the object, in which two possible spin states known as optoelectronic spins are exhibited. Furthermore, the array of optoelectronic spins, i.e., many particles can be generated and controlled by using the modified add-drop filter, in which the broad spectrum soliton can be generated and used to form large scale spin transport applications. © 2011 World Scientific Publishing Company.