Part I: Spintronics and Ultrafast Magnetism: New Paradigms for Novel Terahertz Sources and Detectors
Tobias Kampfrath, Freie Universität Berlin, Germany
Romain Lebrun, Unité Mixte de Physique CNRS, Thales, France
Mathias Vanwolleghem, Institut d'Electronique, de Microélectronique et de Nanotechnologie, CNRS, France
Following the demonstration in 2015 of THz TDS of sub-100fs spin dependent electron scattering in GMR devices, the “reciprocal” effect was quickly discovered, i.e. the generation of ultrabroadband THz pulses generated by fast spin currents in ferromagnetic metallic heterostructures due to the inverse spin Hall effect (ISHE). These results, have led to the appearance of THz spintronics as an active thematic where first practical applications and disruptive technological breakthroughs are being reported. Today pulsed spintronic emitters are competing with photoconductive switches or nonlinear crystals, without being hindered by phonon absorption. They might therefore become key in the spectral range between 1-15 THz where now only cryo-cooled THz QCL’s or bulky gas lasers are available. This special symposium aims at providing a forum for discussing the various recent developments in generating (and detecting) THz through spintronic mechanisms. This includes not only spin-orbit interfaces exploiting spin-Hall effects or Rashba surface states, but also electrically controlled THz coherent oscillations in antiferromagnetic systems. Beyond the description of new fundamental phenomena, aspects such as power optimization, narrowband CW generation, tunability, modulation and polarization control by magnetic anisotropy or magnetoelasticity will be addressed, as well as applications in spectroscopy, ellipsometry, near-field imaging, or testing.
Alexey Kimel, Radboud Universiteit Nijmegen, Netherlands
Tom Seifert, University of Freiburg, Germany
Mark Sherwin, University of California Santa Barbara, USA
Part II: Terahertz Biophotonics: from Fundamental Science to Real Life Applications
Pernille Klarskov Pedersen, Aarhus University, Danmark
Hassan Arbab, SUNY, Stony Brook, US
Andrea Markelz, University Buffalo, US
Terahertz sensing and imaging technology has been growing rapidly with diverse applications proposed across various scientific disciplines. The purpose of this special session is to showcase the biosensing, biomedical imaging and biophotonics applications of terahertz technology. Additionally, timely presentations are considered which report on technological advances in source and detector developments with the aim for application in biophotonics, sensing and non-destructive evaluation. Finally, computational techniques and modelling approaches that help elucidate the interaction mechanisms between terahertz waves and biological tissue, and shine light on the sources of signal contrast in imaging biological specimen are of high interest in this volume. The aim of this special session is to highlight this exciting and developing field, and to serve as a platform to exchange ideas and foster discovery and innovation in terahertz biophotonics.