Holographic Micro-endoscopy based on Multimode Waveguides
Tomáš Čižmár, Leibniz Institute of Photonic Technology, Germany
Organic-inorganic Hybrids for Green Photonic Components Development and IoT
Rute S. Ferreira, University of Aveiro, Portugal
All-optical Control of Magnetism: From Fundamentals to Nanoscale Engineering
Alexey V. Kimel, Radboud University, Netherlands
Holographic Micro-endoscopy based on Multimode Waveguides
Tomáš Čižmár
Leibniz Institute of Photonic Technology
Germany
Brief Bio
Tomáš Cižmár is a Professor in Waveguide optics at the Friedrich-Schiller University Jena, he leads the Fibre Research & Technology department at the Leibniz-IPHT in Jena and the group of Complex Photoonics at ISI Brno. Although his scientific background is Physics, throughout his scientific career he took part in a variety of inter-disciplinary projects in Bio-Medical Photonics, mostly related to optical manipulation, digital holography, microscopy and cell biology. His recent research activities are focused on Photonics in random environments and highly turbid media such as biological tissues or multimode waveguides. * 2017 onwards * Head of the Complex Photonics lab at ISI CAS Brno * Head of the Fibre Research Technology department at Leibniz-IPHT Jena * Professor in Waveguide optics, Friedrich-Schiller University Jena * 2013 - 2017 - Reader in Physics Life Sciences, University of Dundee, Scotland, UK * 2010 - 2013 - Academic research fellow at School of Medicine, University of St Andrews, Scotland, UK * 2007 - 2010 - PDRA at School of Physics and Astronomy, University of St Andrews, Scotland, UK * 2003 - 2006 - PhD at the Institute of Scientific Instruments Masaryk University, Brno, Czechia
Abstract
The turbid nature of refractive index distribution within living tissues introduces severe aberrations to light propagation thereby severely compromising image reconstruction using currently available non-invasive techniques. Numerous approaches of endoscopy, based mainly on fibre bundles or GRIN-lenses, allow imaging within extended depths of turbid tissues, however, their footprint causes profound mechanical damage to all overlying regions.
Progress in the domain of complex photonics enabled a new generation of minimally invasive, high-resolution endoscopes by substitution of the Fourier-based image relays with a holographic control of light propagating through apparently randomizing multimode optical waveguides. This form of endo-microscopy became recently a very attractive way to provide minimally invasive insight into hard-to-access locations within living objects.
I will review our fundamental and technological progression in this domain and introduce several applications of this concept in bio-medically relevant environments.
I will present isotropic volumetric imaging modality based on light-sheet microscopy. Further, I will demonstrate the utilization of multimode fibres for imaging in a brain tissue of a living animal model.
Lastly, I will show the development and exploitation of highly specialised fibre probes for numerous advanced bio-photonics applications including high-resolution imaging and optical manipulation.
Organic-inorganic Hybrids for Green Photonic Components Development and IoT
Rute S. Ferreira
University of Aveiro
Portugal
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Brief Bio
Maria Rute de Amorim e Sá Ferreira André (born 1974) got her Ph.D. in physics from the University of Aveiro, Portugal in 2002 and the Agregação in Physics in 2012, from University of Aveiro. Currently, she is an Associated Professor at Department of Physics (University of Aveiro), coordinates the research Line "Information and Communication technology’’ of CICECO – Aveiro Institute of materials and she is member of the Scientific Council for Exact Sciences and Engineering of the Portuguese Science Foundation (FCT).
She has published over 310 SCI papers and 5 book chapters, with ca. 8500 citations (h-index 46).
Her scientific interests include are focused on the optoelectronic studies on sol-gel derived organic/inorganic hybrids without metal activator centres and doped with lanthanide ions, processed as bulk and nanostructured monoliths and thin films and to crystalline and amorphous nanoparticles of semiconductors. She has hands-on experience on the optical (photoluminescence in steady-state, time resolved modes, and quantum yield, as well as UV/Vis/NIR spectroscopy) and structural (XRD, SAXS, NMR, Raman, and Fourier-transform infrared spectroscopies) characterization of these materials. She has also expertise on the characterization of waveguiding performance of organic-inorganic hybrids and on spectroscopic ellipsometry, including optimization of modelling algorithms. Her research aims at the interpretation of the photophysical behaviour of these materials that is determined by synthesis and processing, foreseeing applications in the fields of optoelectronics and photonics (phosphors, solid-state lighting, and integrated optics) and photovoltaics (luminescent solar concentrators and down-shifting layers).
Abstract
Green photonics describe any device or process that uses photonics in a sustainable way, yielding an environmentally sustainable outcome and improved public health. Distinct main areas were selected as targets towards green photonics, namely, solid-state lighting, photovoltaic, optical communications and sensing with the common goals of generate or conserve energy, cut greenhouse gas emissions and reduce.
Organic-inorganic hybrids lacking metal activator centers and doped with lanthanide ions (Ln3+) and organic dyes processed as thin films with controlled thickness and refractive index will be used as a key elements for green photonic component development, namely to produce white light emitters, integrated optics devices and luminescent solar concentrators. Furthermore, Ln3+-based organic-inorganic hybrids will be used to produce innovative luminescent QR codes multiplexed in colour with enhanced information storage capacity and the ability to sense temperature in real time.
All-optical Control of Magnetism: From Fundamentals to Nanoscale Engineering
Alexey V. Kimel
Radboud University
Netherlands
Brief Bio
Alexey V. Kimel is full professor of physics at Radboud University in Nijmegen. He graduated from Saint-Petersburg Electro-Technical University (LETI) in 1997 and got his PhD from the Ioffe institute in St. Petersburg in 2002. In 2002 he moved to Nijmegen to work on optical control of magnetism. He is a winner of several prestigious research grants among which Veni (2004), Vidi (2006) and Vici (2017) from the Netherlands Organization for Scientific Research (NWO). In 2013 he was awarded a MegaGrant to develop a world-class laboratory specialized on ultrafast dynamics of ferroics at Russian Technological University (MIREA) in Moscow. In 2017 he won the Radboud Science Award which allows the winner to translate his research into learning activities for 10-12 years old kids. He is a senior member of IEEE, member of the Scientific Advisory Board at FELBE (free-electron laser (FEL) at the Electron Linear accelerator with high Brilliance and Low Emittance (ELBE)) Helmholtz Centrum Dresden-Rossendorf, a member of the Proposal Review Panel at FERMI (Free Electron laser Radiation for Multidisciplinary Investigations) in Trieste, a member of a Proposal Review Panel at European XFEL in Hamburg.
Abstract
The 21st century digital economy and technology is presently facing fundamental scaling limits (heating and the superparamagnetic limit) as well as societal challenges: the move to mobile devices and the increasing demand of cloud storage leads to an enormous increase in energy consumption of our ICT infrastructure. These developments require new strategies and paradigm shifts, such as photon- and spin-based technologies. Since the demonstration of magnetization reversal by a single 40 femtosecond laser pulse, the manipulation of spins by ultra-short laser pulses has become a fundamentally challenging topic with a potentially high impact for future spintronics, data storage and quantum computation. The ability to control the macroscopic magnetic ordering by means of femtosecond laser pulses provides an alternative and energy efficient approach to magnetic recording. The realization that femtosecond laser induced all-optical switching (AOS) as observed in ferrimagnets exploits the exchange interaction between their sub-lattices, has opened the way to engineer new and rare-earth-free magnetic materials for AOS. Expansion to hybrid magnetic materials, multilayers, FePt and even magnetic garnets are ongoing efforts to expand AOS to future magnetic recording media technology. Recent developments using plasmonic antennas indicate the possibility to even scale the technique of AOS to the nanoscale, making AOS a potential candidate for fast and energy efficient data storage.
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