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Keynote Lectures

Nonlinear, Tunable and Light-Emitting All-Dielectric Metasurfaces
Isabelle Staude, Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Germany

Optical Tweezers on Nanostructures
Onofrio M. Maragò, CNR-IPCF, Istituto per i Processi Chimico-Fisici, Messina, Italy

 

Nonlinear, Tunable and Light-Emitting All-Dielectric Metasurfaces

Isabelle Staude
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena
Germany
 

Brief Bio
Jun.-Prof. Dr. Isabelle Staude studied physics at the University of Konstanz, and subsequently received her Ph.D. degree from the Karlsruhe Institute of Technology, Germany, in 2011. For her postdoc, she moved to the Nonlinear Physics Centre, Australian National University, Canberra, Australia, where she coordinated the experimental activities on optical nanoantennas and served the nanoplasmonics stream in the Australian Centre of Excellence CUDOS as deputy project leader. She returned to Germany in mid-2015 to establish a junior research group on functional photonic nanostructures at the Institute of Applied Physics and the Abbe Center of Photonics at Friedrich Schiller University Jena, Germany. She received an Emmy-Noether Grant from the German research Foundation as well as the Hertha Sponer Prize 2017 from the German Physical Society. In November 2017, she became a junior professor at the same institution.


Abstract
Optically resonant dielectric metasurfaces have been established as a versatile platform for manipulating light fields at the nanoscale. While initial research efforts were concentrated on purely passive structures, all-dielectric metasurfaces also hold a huge potential for dynamic control of light fields, as well as for tailoring light emission processes, such as spontaneous emission and nonlinear frequency generation. This talk will review our recent advances in nonlinear, tunable and light-emitting all-dielectric metasurfaces, and outline future research directions for next-generation metasurface architectures.



 

 

Optical Tweezers on Nanostructures

Onofrio Maragò
CNR-IPCF, Istituto per i Processi Chimico-Fisici, Messina
Italy
 

Brief Bio
Onofrio M. Maragò studied Physics at the University of Pisa (Italy) and received his DPhil at the Clarendon Laboratory, Oxford (UK), working on Bose-Einstein condensation and superfluidity of ultra-cold atoms. Since 2002 he is Research Scientist at Istituto per i Processi Chimico-Fisici of the Italian National Research Council (CNR-IPCF) in Messina, Italy. His research interests are related to optical trapping, manipulation, and characterization of micro and nanoparticles, for applications in nanoscience, photonics, and soft-matter. He co-authored the textbook “Optical Tweezers: Principles and Applications”, P. H. Jones, O. M. Maragò, G. Volpe, Cambridge University Press (2015). He serves as Advisor for the “Messina OSA Student Chapter” and the “EPS Messina Young Minds Group” promoting topical seminars, meetings, and outreach activities. 



Abstract
Mechanical effects of light are a consequence of conservation laws in light scattering. Optical tweezers, tools based on strongly focused light, enables optical trapping and manipulation of a wide range of microscopic and nanoscopic materials, as well as their characterization. When used as force transducer, they are capable of femtonewton force sensing in photonic force and torque microscopy. For non-spherical particles or at intermediate (meso)scale regimes, shape, aggregation, and composition can have dramatic consequences for optically trapped particle dynamics. Here, after an introduction to optical forces at the mesoscale, we give an overview of results on optical trapping, optical binding, and characterization of 1D (silicon and zinc oxide nanowires) and 2D materials with a focus on scaling laws. Furthermore, we give an overview of applications of optical forces on plasmonic and hybrid particles where surface-enhanced Raman scattering enables ultra-sensitive spectroscopy of biomolecules in liquids.



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