Bjarklev

Prof. Anders Overgaard Bjarklev, President the Technical University of Denmark

“Microwave and Photonic Metamaterials -The DTU Perspective”

The Technical University of Denmark (DTU) was founded in 1829 by the discoverer of the coupling between electricity and magnetism, Hans Christian Ørsted, and today electromagnetics constitutes a major research area encompassing antennas, microwave circuits, optical communication, photonics, remote sensing – and most recently the fascinating field of metamaterials. This plenary talk will overview major DTU contributions to microwave and photonic metamaterial science and propose visions for the future of metamaterials. The talk will touch upon several topics, e.g. the homogenization of periodically structured metamaterials and the retrieval of physically meaningful material parameters constitute a central topic in metamaterial science and one that continuously attract significant research interests. Single and double negative metamaterials facilitate resonances in sub-wavelength structures and the nature of these resonances has been demonstrated for several canonical geometries such as composite cylinders and spheres with ideal or real material models and illuminated by plane waves or point sources. Also, if light propagating in a material can be slowed down, its interaction with the material can be enhanced. Using photonic crystal defect waveguides, it was recently shown that this effect can be used to enhance the gain of an active material, e.g. quantum wells or quantum dots, opening the possibility of realizing ultra-compact slow-light enhanced optical amplifiers for photonic integrated circuits. Another topic will be structural colors: These offer an attractive approach to reduce the number of needed materials in a given product and it provides new perspectives for recycling and sustainability. Also, the role of optical metamaterials has evolved from pure exotic negative index cases and three-dimensional cloaking devices to more realistic examples, which have a strong potential for further development and photonic implementations. Among such examples ¬so called epsilon-near-zero materials, hyperbolic (indefinite) metamaterials, optical topological insulators (non-magnetic optical diodes) and metamaterials with enhanced quantum functions, e.g. exhibiting giant photogalvanic effect. The plenary speech will be based on the significant work and contributions of Lars-Ulrik Aaen Andersen, Samel Arslanagic, Olav Breinbjerg, Andrei Lavrinenko, Niels Asger Mortensen Jesper Mørk, Leif Katsuo Oxenløwe, and Anders O. Bjarklev, Technical University of Denmark


Lemme

Prof. Max Lemme, University of Siegen, Graphene-based Nanotechnology, Germany

“Graphene and related Two-Dimensional Materials: a Toolkit for Future Electronics Applications ?”

After an introduction of the state-of-the art in graphene and 2D materials and technology, this talk will discuss potential “More-than-Moore” applications for these materials. First, graphene field effect transistors (FETs) will be assessed for logic and radio frequency applications, followed by 2D FETs with semiconducting transition metal dichalcogenide (TMD) channels. Next, hot electron transistors with graphene components will be introduced that are projected to allow THz operation. Graphene is a broadband optoelectronic material that can operate from ultra-violet to THz radiation. TMDs are more limited in their spectral response, but show very high photon absorption. I will present examples for discrete photodetectors and modulators co-integrated with silicon photonics. Finally, the low mass of 2D materials makes them interesting for nanoelectromechanical systems. This will be discussed using the example of graphene membrane based piezoresistive pressure sensors.


Peruzzi

Prof. Giulio Peruzzi, Università di Padova e Accademia Galileiana di Scienze Lettere e Arti

“Tops, vortices, and fields. Maxwell and the use of analogies and metaphors in science”

The use of analogies and metaphors goes along the whole historical path of modern science, which was born out of the Scientific Revolution. But a full awareness of the fundamental role of analogies and metaphors in the construction of science is acquired only in the nineteenth century, the century in which specialisation becomes more and more crucial to the growing of scientific knowledge. Actually, in phases of increasing specialisation, analogies and metaphors become important tools to reveal unexpected relations among different research areas and to disclose new research perspectives. Many scientists during the nineteenth century use these tools, but probably James Clerk Maxwell is the one who explores and exploits their power with the greatest epistemological awareness and skill. The overwhelming majority of the results of his researches, achieved in less than thirty years in physics, geophysics, physiology, metrology, engineering, are the prerequisites for important research areas up till now. One of the main reasons of the width and depth of his scientific production is actually the use of analogies and metaphors, which gives him the opportunity to connect different research areas by interpreting the results already obtained in a research area as a useful element to make progress in different and less known areas. In this perspective, we will retrace some of Maxwell’s most important scientific contributions, underlining the fertility of his approach for the subsequent devolpment of science and technology.

Sessione plenaria