Effect of the Magnetorheological Nanoparticles Doped with Polydimethylsiloxane for the RNA Detection
Assist. Prof. Dr. Amir Roushdy Ali
Assistant Professor in Mechatronics Engineering Department at the German University in Cairo (GUC)
Abstract
In this paper, we present a new fabrication method for the whispering gallery mode (WGM) micro-sphere based electric field sensor that allows for longer time periods of sensitivity. Recently, a WGM-based photonic electric field sensor was proposed using a coupled dielectric microsphere-beam. The external electric field imposes an electrostriction force on the dielectric beam, deflecting it. The beam, in turn, compresses the sphere causing a shift in its WGM. As part of the fabrication process, the PDMS micro-beams and the spheres are curried at high-temperature (100oC) and subsequently poled by exposing to the strong external electric field (~8 MV/m) for two hours. The poling process allows for the deposition of surface charges thereby increasing the electrostriction effect. This methodology is called curing-then-poling (CTP). Although the sensors do become sufficiently sensitive to an electric field, they start de-poling after a short period (within ~ 10 minutes) after poling, hence losing sensitivity. In an attempt to mitigate this problem and to lock the polarization for a longer period, we use an alternate methodology whereby the beam is poled and cured simultaneously (curing-while-poling or CWP). The new fabrication method allows for the retention of polarization (and hence, sensitivity to the electric field) longer (~ 1500 minutes). An analysis is carried out along with preliminary experiments. Results show that electric fields as small as ~ 100 V/m can be detected with a 300 mm diameter sphere sensor a day after poling.
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Biographical Sketch
Amir R. Ali is an Assistant Professor in Mechatronics Engineering Department at the German University in Cairo (GUC). Amir is a Visitor Research Scholar in Mechanical Engineering Department at Texas Tech University (TTU). Also, Amir is a Visitor Research Assistant Professor in Mechanical Engineering Department at Southern Methodist University (SMU). He is also appointed as guest researcher at the Institute for Technical Optics (ITO), at the University of Stuttgart (Germany). Amir is the founder and general director of the ARAtronics Lab (Applied-Science & Robotics Laboratory for Applied-Mechatronics) at the German University in Cairo. Amir is also the CEO & Co-Founder at ONGINEERINGco; the consultation corporate that builds portable embedded micro-controllers and robotics solutions that are perfectly adapted to firmware engineers, embedded designers and makers in the following fields (Mechatronics, Autonomous and Robotics; Automation Test; Industrial Automation; Home Automation Solutions; Internet of Things (IoT); Product Development; Health Monitoring Structures; Bio-medical Instrumentations and Sensing Technology).
Amir received PhD degrees in Mechanical Engineering in 2015 from Southern Methodist University in Dallas, Texas, USA and his Master’s Degree as well as the German Diploma in Mechatonics Engineering in 2010 from The German University in Cairo (in Egypt) and Erlangen Nuremberg University (in Germany) respectively. Amir specialized in the field of optical metrology and sensing, biomedical sensing and electromagnetic-field-based sensing, in particular employing whispering gallery mode resonators. Therefore, his research work has a clear focus, which however allows access to a very broad range of applications, ranging from chemical sensors, to mechanical- or motion-sensors, up to biomedical probes even applicable in vivo. As his research is based on the interaction of the electromagnetic field with the environment, a strong analytical and theoretical background is required, as well as appropriate experimental equipment and skills to manufacture the sensors and measure the effects. His extensive list of publications proves that his sensor-technology is novel, attractive and interesting to the optical community. Prominent journals in the field of optics are for example Optics Express, Applied Optics and the Journals of the Optical Society of America. Amir has published papers in all that journals and this would also be the journals, which prefer to publish, as they are well accepted and read in the optical community. Moreover, he addresses the material and sensing aspects via publications in Optical Physics Sensors, Chemosensors, and the Journal of Polymer Science, which are the corresponding major journals for sensing applications.
Amir research papers have been accepted and published in peer viewed journals and international conferences. In 2017, Amir appointed as the Editorial Board of American Journal of Optics and Photonics for two more years. In 2019, Amir as an international reviewer in the QS Intelligence Unit (QSIU) for the world universities ranking authority. Currently, Amir is a reviewer at the Optical Society of America (OSA); reviewer for the American Institute of Physics (AIP) and Reviewer at the Austrian Science Fund (FWF). Amir received the notable alumni award from the Southern Methodist University in 2017. He has been awarded the Dean's and the ME Department's award for best presentation at the SMU Research day in 2013. He also won the best presentation award at the Research Improve sponsored by the Lyle School of Engineering for the same year. He is a member of the Society of Photo-optical Instrumentation Engineers (SPIE), American Society of Mechanical Engineers (ASME), American Institute of Aeronautics and Astronautics, (AIAA) and (IEEE). |
