Dr. Ing. habil Ajay K. Poddar of Oradea University, Romania

The Casimir effect can be understood by the idea that the presence of conducting metals and dielcrics alters the vaccum expecration value of the energy of the second quantized electromagnetic field. The value of this energy depends on the shapes and positions of the conductors and dielectrics, the Casimir effect manifests itself as a force between such objects. The causes of the Casimir effect are described by QUATUM Field Theory which states that all of the various fundamental fields, such as the electromagnetic field, must be quantized at each and every point in space. In a simplified view, a "field" in physics may be envisioned as if space were filled with interconnected vibrating balls and springs, and the strength of the field can be visualized as the displacement of a ball from its rest position. Vibrations in this field propagate and are governed by the appropriate wave equation for the particular field in question. The 2nd quantaziation of quantum field theory requires that each such ball-spring combination be quantized, that is, that the strength of the field be quantized at each point in space. At the most basic level, the field at each point in space is a simple harmonic oscillator, and its quantization places a quantum harmonic oscillator at each point. Excitations of the field correspond to the elementry particles of particle physics. In reality, vaccum is a complex structure, so all calculations of quantum field theory must be made in relation to this model of the vacuum. The vacuum has, implicitly, all of the properties that a particle may have: spin or polarization in the case of light, energy, and so on. On average, most of these properties cancel out: the vacuum is, after all, "empty" in this sense.

This talk presents the casimir effect: attractive and replusive for the applications in RF MEMS based switching devices. MEMS (Micro-Electromechanical system) based electronics offer inexpensive high performance solutions. But reliability issues arising from stiction in MEMS switching devices prevents the technology for high frequency applications. The application of repulsive force caused due to casimir effect relates to techniques for stiction-free MEMS lateral switch and its application in switching network, phase shifters in electronically scanned phase array antennas for Internet of Things (IoT) applications. In vacuum, the force of attraction between two surfaces in nanometer range is explained by Casimir effect, but effective repulsive forces can be noticed when the two surfaces with materials of different permittivity are taken into consideration. This phenomenon can be also observed if one of the surfaces possesses negative permittivity. This approach can resolve the stickiness problem, leading to new material and fabrication methods in next generation electromechanics.

Biography:

Dr. Ajay K. Poddar graduated from IIT Delhi, and did Doctorate (Dr.-Ing.) from Technical University Berlin, Germany, Post Doctorate (Dr.-Ing. habil) from Brandenburg Institute of Technology, Cottbus, Germany.

Dr. Poddar is a professor at Oradea University, Romania.

Dr. Poddar received several awards for his scientific achievements, holds several dozen patents and published over 300 scientific papers in international conferences, and professional journals, contributed as an author/coauthor of 6-technical books.

Dr. Poddar is serving as Academic advisory board member of Don Bosco Institute of Engineering, Bombay, India; Fellow member of IEEE professional society.  

Email:

Address:University of Oradea, , Oradea, Romania

Dr. Ing. habil Ajay K. Poddar of Oradea University, Romania

Biography:

Email:

Address:Oradea, Romania