Browsing by Author "Chat Teeka"

Now showing 1 - 8 of 8
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    An optical buffer manipulation using a microring array
    (2011) Suphanchai Punthawanunt; Chat Teeka; Rangsan Jomtarak; Preecha P. Yupapin; S. Punthawanunt; Faculty of Science and Technology, Kasem Bundit University, Bangkok 10250, Thailand; email: suphanchai@kbu.ac.th
    We present design and FDTD simulations of microring resonator array optical buffer. The proposed buffer consists of six microring array coupled via upper MZI arm and one microring coupled via lower MZI arm all coupled with 105 nm gap coupling. Results obtained have shown that the delay signals can be available for the use for optical memory and applications.
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    Atom bottom-up manipulation controlled by light for microbattery use
    (2012) Farrah Dilla Zainol; Rangsan Jomtarak; Suzairi Daud; Chat Teeka; Jalil Ali; Preecha P. Yupapin; F.D. Zainol; Institute of Advanced Photonics Science, Nanotechnology Research Alliance, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia; email: fairy-elie@yahoo.com
    In this paper, we propose a new design of the atom bottom-up technique that uses an optical trapping tool to form the atom trapping layer within a thin-film grating. By using a PANDA ring resonator, where atoms can be trapped, pumped, and controlled by light, the trapped atoms/molecules can be selected, filtered, and embedded within the required thin-film grating layers to manufacture nanobattery. In application, P-type or N-type atom can be prepared, trapped, and embedded within the desired thin-film layers, and finally, the microbattery can be manipulated. The theoretical background of light pulse in a PANDA ring resonator is also reviewed. © 2002-2012 IEEE.
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    Filter design using multi-bragg reflectors
    (2012) Fairuz Diyana Ismail; Muhammad Safwan Aziz; Chat Teeka; Jalil Ali; Preecha Phromphan Yupapin; P.P. Yupapin; Nanoscale Science and Engineering Research Alliance, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; email: kypreech@kmitl.ac.th
    In this paper, we present the use of mathematical modeling of dielectric mirror known as known as Bragg reflector for optical design. A device system consists of the identical alternating layers using high and low refractive indices. Results obtained have shown that the model applications such as quarter-wavelength layers, unequal-length layers, short-pass and long-pass filters, and transmission filter design can be simulated and plotted.
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    Mathematical simulation of nonlinear effects in micro ring resonator
    (2006) P.P. Yupapin; Chat Teeka; Pakkinee Chitsakul; P.P. Yupapin; Department of Applied Physics, Faculty of Science, King Mongkut' S Institute of Technology Ladkrabang, Bangkok 10520, Thailand; email: kypreech@kmitl.ac.th
    In this paper, we demonstrate the mathematical simulation data of light traveling in an optical micro ring resonator. The optical nonlinear properties such as chaos, bifurcation, bistability and instability of the optical outputs are studied. By changing the optical parameters that result the change of the optical output intensities, the nonlinear behaviors such as bifurcation, chaos and bistability effects are occurred. The relationship between the optical parameters and output intensities are derived by varying the interested parameters such as coupling coefficient (_), nonlinear refractive index (n2), and linear phase shift (_0). The results obtained are presented and plotted showing that the optical parameters can be changed i.e. controlled, and then the nonlinear effects characteristics can be predicted and controlled. © 2006 IEEE.
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    Nanocommunication networks
    (Nova Science Publishers, Inc., 2012) Preecha P. Yupapin; Somsak Mitatha; Jalil Ali; Chat Teeka
    Optical devices have become interesting tools that can be used in various applications. The use of such devices have been investigated in many areas such as E/O (electrical/optical) and O/E(optical/electrical) signal converters; optical signal processing; optical sensor; optical communication and medicine, etc. More interesting applications have been introduced such as the use of a micro/nano scale device, which has become both interesting and challenging. In this book, the behavior of light(light pulse) within the micro and nano scale device(ring resonator) is investigated. This can be integrated to form circuit and system devices that can be used for atom/molecule trapping and transportation; optical transistor; fast calculation device(optical gate); nanoscale communication and networks and a device for medical applications. © 2012 by Nova Science Publishers, Inc. All rights reserved.
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    Nanoscale nonlinear panda ring resonator
    (CRC Press, 2012) Preecha P. Yupapin; Chat Teeka; Muhammad Arif Jalil; Jalil Ali
    Microring/nanoring resonator is an interesting device that has been widely studied and investigated by researchers from a variety of specializations. This book begins with the basic background of linear and nonlinear ring resonators. A novel design of nano device known as a PANDA ring resonator is proposed. The use of the device in the form of a PANDA in applications such as nanoelectronics, measurement, communication, sensors, optical and quantum computing, drug delivery, hybrid transistor and a new concept of electron-hole pair is discussed in detail. © 2012 by Taylor & Francis Group, LLC.
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    Optical spin generated by a soliton pulse in an adddrop filter for optoelectronic and spintronic use
    (2012) Sorayut Glomglome; Itsara Srithanachai; Chat Teeka; Somsak Mitatha; Surasak Niemcharoen; Preecha P. Yupapin; P.P. Yupapin; Nanoscale Science and Engineering Research Alliance (NSERA), Faculty of Science, King Mongkuts Institute of Technology Ladkrabang, Bangkok 10520, Thailand; email: kypreech@kmitl.ac.th
    A new concept of an optical spin generation using bright and dark soliton conversion behaviors within a modified optical adddrop filter known as PANDA ring resonator is proposed. The orthogonal solitons can be formed within the system and detected simultaneously at the output ports. Under the resonant condition, the dark and bright soliton pair corresponding to the left-hand and right-hand rotating solitons (photons) can be generated. When a soliton 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(soliton) spins are exhibited. Furthermore, an array of soliton spins, i.e. particles can be generated and detected by the proposed system, which can be used to form large scale spin generation. © 2011 Elsevier Ltd. All rights reserved.
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    Teaching specific heat using learning by laboratory activity
    (American Institute of Physics Inc., 2019) Noppawan Lohajinda; Khwanchanok Pathumsara; Chat Teeka; C. Teeka; Physics Education Program, Faculty of Science and Technology, Suan Dusit University, Thailand; email: chat.teeka@gmail.com
    This paper is proposed to the simple experimental setup for finding the specific heat of unknown objects without the use of a calorimeter by using the Newton's law of cooling and to help students understand in specific heat topic has been proposed. The experiment was developed as a teaching tool for specific heat topic, in order to build unknown objects experiments to use at the first-year undergraduate student with enroll in general physics course. The specific heat of an unknowns using cola can, zinc coffee can and glass marble as the measuring equipment. The specific heat of a substance can be measured by using a container filled with water (the system) and submerging a sample of the unknown to be investigated. The cooling curves of the system container/water and container/water/sample can be used to determine the specific heat of unknown objects. Moreover, 46 first-year undergraduate students with enrolled in general physics course, Suan Dusit University were taught using this experimental set. The teaching divided into 3 stages, the pre-test session, the activity by using laboratory-based learning, and the post-test session. The finding indicated that a concept of specific heat was at 84.55 percent which was higher than criterion at 0.05 (t = 18.22) level of significance, and students' satisfaction was good. With a simple apparatus this set of experiment was highly suitable as a teaching material for the integration of Newton's law of cooling and specific heat concepts. � 2019 Author(s).