A Novel Multiphysics Analytical Framework for Terahertz Piezoelectric and Magneto-Electro-Elastic Nanospherical Antennas in Dielectric and Plasmonic Media

This paper presents a unified analytical framework for terahertz electromagnetic radiation from piezoelectric and magneto-electro-elastic (MEE) nanospherical structures embedded in dielectric and plasmonic matrices. By synthesizing two previously published studies, it provides a comprehensive perspective on the role of nanoscale surface and interfacial multiphysical effects in acoustically actuated nanoantennas and nanoresonators. First, a piezoelectric nanosphere in a polymer matrix is analyzed under longitudinal (P) acoustic waves. The high surface-to-volume ratio necessitates rigorous modeling of polarization and stress at the nanosphere-matrix interface. Classical electrodynamics alone is inadequate; surface/interface elasticity theory is extended to MEE media, and the fully coupled elastodynamic-Maxwell equations are solved via vector and tensor spherical harmonics. Results reveal the influence of nanosphere dimensions on radiated power, resonance frequency, and magnetic field distribution. Second, a MEE nanospherical shell embedded in metallic or dielectric matrices is examined. Surface effects at the free inner boundary and shell-matrix interface are treated using the Equivalent Impedance Matrix method, with metallic matrices modeled via a plasmonic plasma-based approach. Spectral solutions enable precise evaluation of resonance shifts and radiated power variations. This synthesis highlights the critical impact of surface/interface effects and provides a consolidated theoretical foundation for the design of next-generation terahertz nanoscale antennas, sensors, and resonators.

کلیدواژه ها:

Terahertz ، Piezoelectric ، Magneto-Electro-Elastic ، Nanospherical Antennas ، Dielectric ، Plasmonic Media