[Special Talk]:Dhiraj Sinha PhD-Broken Symmetries in Radiating Structures and Antenna Miniaturisation for Biomedical Sensing

Abstract:

The talk would be focussed on the role of broken symmetries in electromagnetic radiation and its application on antenna miniaturisation for sensing in biomedical systems. According to Maxwell, electron acceleration results in radiation. However, there are several instances where electron acceleration does not result in radiation; the simplest example is a two wire parallel transmission line under time varying excitation. For radiation, the given electrodynamic system must offer a geometric framework for symmetry breaking of the electric field in space while the given structure may or may not have geometric symmetry. The perspective offers an integrated theoretical framework towards understanding the mechanism of radiation from different kinds of antennas, viz. dielectric, piezoelectric, metallic wire or a simple inductor-capacitor system. It also offers a new dimension towards defining the sensitivity of antennas used in biomedical sensors where symmetry induction can destroy the signal. The idea can be used in designing capacitor based antennas at chip level for high sensitivity applications and biomedical implants.

The talk will also offer an overview of the initial work on radiation by Maxwell, Thomson and Marconi and the apparent theoretical gaps while highlighting some of the open ended questions in classical electromagnetism and its correlation to current applications. 

Reference:

Sinha, D., & Amaratunga, G. A. (2015). Electromagnetic Radiation under Explicit Symmetry Breaking. Physical review letters, 114(14), 147701.

Dhiraj Sinha is a postdoctoral research fellow at the Research Laboratory of Electronics, MIT. His research interests are aligned towards radiating structures with low degrees of freedom. Currently, he is working on radio emission from ferrous complexes in red blood cells for biomedical applications.

Dhiraj got his undergraduate degree in electrical engineering from the Institute of Engineering and Technology, University of Lucknow, India and Ph.D. in Electrical Engineering from Cambridge University, UK. His work on the interaction between radio signals and microstructures led to the discovery of the role of symmetry breaking in electromagnetic radiation which aims to connect the theoretical gaps in the model of radiation outlined by Thomson, the theoretical predictions on radiation by Maxwell and the empirical work on radiating systems carried by Marconi while using the Noether’s theorem as the foundation.