79 78 Principal Scientist Profiles Falk Eilenberger Falk Eilenberger Principal Scientist Profiles HEAD OF THE RESEARCH GROUP PHOTONICS IN 2D-MATERIALS AT THE INSTITUTE OF APPLIED PHYSICS AND HEAD OF THE DEPARMENT FOR NANO- AND MICROTECHNOLOGY AT FRAUNHOFER IOF Falk Eilenberger Head of Department for Nano- and Microtechnology at the Fraunhofer IOF Jena. In parallel, he is leading an academic Research Group called “Photonics in 2D-Materials”at the Institute of Applied Physics where the physics of nano materials by integrating them with optical nanostructured systems is explored. Prior to this, Falk Eilenberger received his PhD on ultrafast nonlinear photonics from the University of Jena and was a visiting scholar at the University of Sydney. FALK EILENBERGER RESEARCH AREAS We structure matter on the nanoscale to induce and investigate quantum light matter interaction down to the atomic scale. To achieve this we utilize materials which are intrinsically nanoscopic, such as 2D-Materials and we create nanostrcutures on a large scale using state of the art lithography tools. This approach yields a unique bottom-up / top-down toolset, which we use to create nanostructure empowered optical components. Among these are metasurfaces, spectroscopic solutions, quantum light sources, and photonic sensing devices alike. TEACHING FIELDS • Introduction to Nanooptics • Quantum Computing • Nanotechnology Lab RESEARCH METHODS The team and its collaborators are operating tools to experimentally realize and study optical with nanostructures: • Nanocharacterization tools: SEM, AFM, optical near fields microscopy • Quantum-optical characterization tools: HBT- and HOMspectrometer, high order interference experiments • Tools for large scale (12”) fabrication of nanostructures (e-beam lithography, photolithography, etching tools • Wafer scale characterization equipment for quantum integrated circuits RECENT RESEARCH RESULTS Two-dimensional materials can be integrated with almost all optical systems. Among these we have focus on optical resonators, metasurfaces, and guided wave systems, all of which can be used to enhance the light-matter interaction strongly and in a scalable manner. Guided wave systems enhance light-matter interaction by increasing the interaction length from sub-nanometer to possibly the length scales of meters for optical fiber or to chip-scale for semiconductor waveguide. We have recently demonstrated that 2D-materials can be grown at high quality directly on the core of optical fibers, functionalizing those into active photonic systems. Such 2D-functionalized fibers are shown to exhibit second order nonlinearity [1] and environmentally sensitive photoluminescence properties [2]. Optical resonators and resonant surfaces on the other hand can be used to enhance and tailor light matter interaction on specific modes; leading directly into the strong coupling regime where the role of light and matter can no longer be distinguished and new hybrid quantum systems are formed. Among these are room temperature Bose-Einstein-Condensates [3] and single photon sources with extremely high diffraction efficiency [4]. Besides photonic research in 2D-materials we are investigating quantum computers for their ability to simulate complex states of light and to demonstrate their usability in interferometric sensing schemes [5]. LARGE SCALE METASURFACES We use a set of lithographic tools to fabricate large scale nanophotonic surfaces, which draw their functionality from subwavelength structures in various highly functional materials. Our lithography tools set is centred on an ultrafast 12’’ maskless character-projection machine, which is able to pattern arbitrary optical surfaces in a very short amount of time. We recently demonstrated a 300 mm metasurface grating; highlighting our technological capabilities [6]. Using lithographic processes we pattern standard optical materials such as glass or silicon but also high active materials, such as LiNbO3, TiO2 or diamond. As such we are able to create neararbitrary optical surfaces, which operate from the EUV to the far Infrared. Many projects are application-driven, for example in projects for astronomy, earth observation, high intensity laser systems but also customer electronics and the semiconductor industry. [1] Ngo et al., Nature Photonics 16, 769 (2022). [2] Ngo et al.,Advanced Materials 32 (47), 2070354 (2020). [3] Shan et a., Nature communications 12 (1), 6406 (2021). [4] Drawer et al.,Nano Letters 23 (18), 8683-8689 (2023). [5] Conlon et al., Nature Physics 19 (3), 351-357 (2023). [6] Zeitner et al., Journal of Micro/Nanopatterning, Materials, and Metrology 22 (4), 041405 (2023). Contact: Phone: + 49 3641 807 274 Email: falk.eilenberger@iof.fraunhofer.de
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