Reconfigurable Topological Insulators
MetadataShow full item record
This thesis focuses on engineering materials that can be built to form the foundation for next generation communication systems and quantum computers in order to store, process and transmit information. Tremendous progress in developing prototypes of quantum computers has been reported; however, the performance of such systems is low as they are prone to errors. Topological insulators provide a fundamental mechanism to overcome such errors, and thus pave a way for robust information transfer techniques. Topological insulators were first proposed and studied for fermionic systems which started a new branch in physics: Topological physics. In 2016, Noble Prize in physics was awarded to David J Thouless, F.D.M Haldane, J. Michael Kosterlitz for the development fundamentals in this area. A major drawback for electronic systems is the lack of materials that are readily found in nature, and the designed materials operate at very low temperatures. This reasons impede the of applications such materials for practical purposes. Recently, this idea was implemented in bosonic systems, and many theoretical and experimental observations were investigated at microwave frequencies. However, a major setback is the losses in metals at optical frequencies. In order to have engineered materials to improve the performance of present-day communication systems, it is desirable to have them integrable with it. Here, I demonstrate a photonic topological insulator designed to operate at telecom frequencies that is compatible with CMOS technologies. This design have topological pseudo-spin states that are protected against any disorder that does not break the lattice symmetry of the system. In contrast to all the proposed designs that operate at fixed frequency range, I also propose this design to be dynamically tunable enabling superior control over the light inside the structure. Apart from designing this system, I also demonstrate the application of the dynamically reconfigurable TI in optical structures.