Abstract:
Modern nanofabrication technologies have allowed us to enter the deep-nanometric (nm) regime. At this scale nonclassical effects emerge in metal-based nanoscatterers and nanoantennas, devices which hold a prominent role in modern nanophotonics, a field that has a great application potential in e.g., sensing, energy harvesting, precision chemistry, etc.. These nonclassical effects are deeply rooted in the quantum dynamics of free electrons in metals. Fundametally, the classical picture where the free electron polarization current, i.e., the flow of free electrons, is linked with the total electric field at the same spatial position via a macroscopic parameter, e.g., permittivity, has to be upgraded. This leads to a nonlocal constitutive relation that is encoded in an additional partial differential equation alongside with Maxwell's equations. This drastic change results in a computational gap between quantum physics and macroscopic computational electromagnetics (CEM). This talk will cover our most recent efforts to bridge this gap. We will review relevant physical models, propose very efficient computational techniques, and demonstrate numerical examples and their comparisons with more advanced full-quantum simulations. All of these open a path for a rising research domain, named mesoscopic computational electromagnetics, which will definitely facilitate future explorations of extreme optics and provide efficient and effective computational tools for the next generation of practical opto-electronic devices.
Biography:
Guy A. E. VANDENBOSCH received the M.S. and Ph.D. degrees in Electrical Engineering from the Katholieke Universiteit Leuven, Leuven, Belgium, in 1985 and 1991, respectively. Since 1993, he has been a Lecturer, and since 2005, a Full Professor at the same university. His research interests are in the area of electromagnetic theory, computational electromagnetics, planar antennas and circuits, nano-electromagnetics, EM radiation, EMC, and bio-electromagnetics. His work has been published in ca. 440 papers in international journals and has led to ca. 450 papers at international conferences. Guy Vandenbosch was a member of the “Management Committees” of the consecutive European COST actions on antennas since 1993. Within the ACE Network of Excellence of the EU (2004-2007), he was a member of the Executive Board and coordinated the activity on the creation of a European antenna software platform. After ACE, from 2007 – 2018, he chaired the EuRAAP Working Group on Software. In the period 1999-2004, he was vice-chairman, in the period 2005-2009 secretary, and in the period 2010-2017 chairman of the IEEE Benelux Chapter on Antennas and Propagation. In the period 2002-2004 he was secretary of the IEEE Benelux Chapter on EMC. In the period 2012-2014, he was secretary of the Belgian National Committee for Radio-electricity (URSI), where he is also in charge of commission E. Guy Vandenbosch is a fellow of the IEEE. In 2023, he received the “Antenna Award”, a lifetime achievement award from EurAAP, the “European Association on Antennas and Propagation”. From September to December 2014, he was a visiting professor at Tsinghua University, Beijing, China. From 2017 to 2020 he was a member of the IEEE Electromagnetics Award Committee.
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