PROFESSOR PAO'S INFLUENCE ON RESEARCH IN COUPLED FIELD PROBLEMS, CHIRALITY AND ACOUSTIC AND ELECTROMAGNETIC METAMATERIALS AND THEIR APPLICATIONS

摘要

This paper reviews the theme "Unity in Diversity" that envelopes acoustics, electromagnetics and elastodynamics. The Helmholtz decomposition of vector fields in terms of scalar and vector potentials serves to unify all continuum fields while the constitutive models that have been developed to explain the observed experimental behavior of the fields introduces diversity in wave propagation. This serves as a fertile ground for consideration of various coupled field problems. In this paper, the term coupling is used to refer to the coupling of solenoidal and irrotational fields as well as the coupling of electric and magnetic fields or elastodynamics and electromagnetic fields. It will be clear from this paper that developments during the last quarter century or more from consideration of coupled fields have lead to the development of many exciting applications using piezoelectric, piezomagnetic, magneto-electric, chiral and currently metamaterials. This paper reviews contributions in these areas for applications to sonar and radar coatings, NDE, smart materials and structures, electromagnetic and elastodynamics chirality and electromagnetic and acoustic metamaterials.