Interaction between electromagnetic waves and moving-medium gives rise to a wide range of interesting phenomena such as: bianisotropy, Cherenkov amplification, non-reciprocity etc. Engineering applications of these phenomena can lead to many breakthrough technologies in the near future. This seminar presents fundamental investigation of negative-frequency modes and the resultant photonic topological transformation in moving-media. The underlying connection between photonic topology, negative-frequency modes and Cherenkov amplification is revealed. It is shown that negative-frequency modes can be harnessed to achieve non-reciprocal and loss-less propagation in moving metal-insulator-metal waveguide structure. This research builds new theoretical foundation for the development of next-generation of technologies, ranging from non-reciprocal components at mm- wave/THz frequencies to nano-scale kinetic-to-EM energy conversion.
Dr. Sarang Pendharker received his M.Tech+Ph.D. Dual Degree from the Indian Institute of Technology Bombay, India in 2014. Since January 2015, he is a post-doctoral fellow with Prof. Zubin Jacob's group at University of Alberta, Canada. His research specialization is in Microwaves, Electromagnetic Wave Theory and Photonics. His doctoral research focused on developing a new class of optically reconfigured microwave circuits and devices. Currently he is involved in (i) theoretical research on photonic topology, (ii) developing EM mode solvers for moving-media structures, and (iii) experimental research on super-resolution 3D optical tomography. He is an active reviewer for major international journals in microwave and optics, and has received outstanding reviewer award for the year 2016 from the Journal of Optics, Institute of Physics Publishing, U.K.