151 150 Principal Scientist Profiles Isabelle Staude Isabelle Staude Principal Scientist Profiles PROFESSOR AT THE INSTITUTE FOR SOLID STATE PHYSICS Prof. Dr. Isabelle Staude joined the Abbe Center of Photonics in 2015. Initially, she established a junior research group on functional photonic nanostructures, before becoming a professor for photonic nanomaterials in April 2020. Before that, she was a postdoc at the Nonlinear Physics Centre, Australian National University. She received her Ph.D. degree from the Karlsruhe Institute of Technology, 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. She is the speaker of the International Research Training Group“Tailored Metasurfaces - Generating, Programming and Detecting Light, and a member of the Management Board of the Collaborative Research Center (SFB)“Nonlinear Optics Down to Atomic Scales (NOA)”. ISABELLE STAUDE RESEARCH AREAS Dr. Staude’s research focuses on the use of designed photonic nanostructures which are to control the emission, absorption, and propagation of light at the nanoscale level. Her research topics include: • Nanophotonics, -plasmonics, and -antennas • High-index dielectric nanoparticles • Hybrid quantum systems and quantum emitters • Nanofabrication technology • Subwavelength optics • Metamaterials and photonic crystals • Two-dimensional materials TEACHING FIELDS During her course lectures, she is committed to sharing not only her knowledge, but also her fascination for optics at the nanoscale. She gives courses in: • Introduction to Nanooptics • Semiconductor Nanomaterials • Optical Metrology and Sensing RESEARCH METHODS For the experimental realization and study of functional photonic nanostructures, the research group on Photonic Nanomaterials led by Dr. Staude employs a range of state-of-the-art nanotechnology and optical characterization techniques, including: • Electron-beam lithography based nanofabrication • Linear and nonlinear optical spectroscopy • Time-resolved photoluminescence spectroscopy • Back focal plane imaging • Assembly of hybrid nanostructures via dry transfer • Assembly of hybrid quantum systems by selective surface functionalization RECENT RESEARCH RESULTS Resonant nanoparticles and their assemblies can show complex and often surprising interactions with light, giving rise to phenomena such as „magnetic light“, directional scattering, Fano resonances, and strong near-field enhancements. Using the capabilities of modern nanotechnology, these interactions can be tailored by the size, shape, material composition, and arrangement of the nanoparticles. Resonant nanoparticle structures are a versatile research platform for investigating fundamental light-matter interactions and nanoscale coupling phenomena. Furthermore, they provide unique optical functionalities, opening new opportunities for applications like next-generation (quantum) light sources, optical communications, and truly flat optical components. In our research we combine top-down and bottom-up nanofabrication approaches to experimentally realize composite photonic systems. Using these systems, we strive to control the emission, propagation, and absorption of light - and all of its properties at the nanoscale. Recently we have focused on nanoparticles composed of highly transparent, high-refractive-index dielectrics. Such nanoparticles support localized electric and magnetic Mietype resonances (see image), thereby providing a low-loss alternative to plasmonic nanostructures [1]. Most prominently, highly efficient functional nanosurfaces [2], e.g., for resonant wavefront shaping [3] and nonlinear frequency generation [4] can be created by dedicated arrangements of designed dielectric nanoresonators on a plane. Active tuneability of dielectric nanosurfaces has been achieved using liquid crystals [5]. Furthermore, we have studied the use of Mie-resonant all-dielectric nanoparticles as high-radiation efficiency nanoantennas for spontaneous emission control [6, 7]. TUNABLE METASURFACE DISPLAYS IN THE VISIBLE In recent years, tunable metasurfaces and metadevices have attracted extensive research efforts, aiming at pushing optical metasurfaces towards practical applications. Infiltrating metasurfaces with nematic liquid crystals (LCs) is an attractive approach due to its high compatibility with the existing industrial technologies and optical devices. Recently, we demonstrated a LC-infiltrated metasurface with large electrically controlled transmittance modulation in the visible spectral range and showed its suitability for display applications. In contrast to conventional LC displays, the transmittance modulation takes place inside the subwavelength metasurface, rather than in the bulk LC layer. Additionally, for the first time we used a dedicated photoalignment material to define the pre-alignment of the liquid crystal molecules. Our demonstration shows that LC tunable metasurface displays hold the potential for largely reducing the LC layer thickness, display pixel size, and thus to significantly reduce the device response time, power consumption and to improve the display resolution. [1] Staude et al., ACS Nano 7, 7824 (2013). [2] Decker et al., Adv. Opt. Mater. 3, 813 (2015). [3] Chong et al., Nano Lett. 15, 5369 (2015). [4] Shcherbakov et al., Nano Lett. 14, 6488 (2014). [5] Zou et al., ACS Photonics 6, 1533 (2019). [6] Bucher et al., ACS Photonics 6, 1002 (2019). [7] Vaskin et al., Nano Lett. 19, 1015 (2019). Contact: Phone: + 49 3641 9 47330 Email: isabelle.staude@uni-jena.de
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