BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:MechE Colloquium: 3D printed microoptics: State of the art and fut ure challenges DTSTART:20211109T121500 DTEND:20211109T131500 DTSTAMP:20260930T185339Z UID:ee38d1fea802087c586476bcdbfd60e3b457e7f31b4b2bd9400adbb2 CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Harald Giessen\, Faculty of Mathematics and Physics\, Un iversity of Stuttgart\nAbstract:\n3D printing using femtosecond lasers giv es submicron resolution when polymerizing plastics by two-photon absorptio n. The small voxel size well below the diffraction limit and the combinati on with high-speed scanners and high-precision piezo stages allows for the creation of millimeter-sized 3D optics with unprecedented design freedom. We will demonstrate that such complex optics with aspherical and freeform surfaces without rotational symmetry can lead to novel miniature optics w ith wavefront aberrations as small as lambda/10. Multiple materials can be combined with different refractive indices and dispersions\, thus allowin g for Fraunhofer-type achromats. Diffractive optics can be 3D printed as w ell\, and stacking several Fresnel-type surfaces leads to aplanatic imagin g systems. Hybrids that combine diffractive and refractive surfaces as wel l as transparent and opaque materials enhance the imaging capabilities eve n further. When combined with imaging fibers or CMOS imaging sensors\, an entire new class of miniature optical devices can be created which will re volutionize augmented and virtual reality as well as self-driving cars. Fi ber-based optical trapping\, side-looking OCT endoscopes\, the smallest im aging endoscope in the world\, as well as applications in quantum technolo gy pave the way towards future functionalities and applications [1-7].\n\n [1] T. Gissibl et al.\, Optica 3\, 448 (2016)        .\n[2] T. Giss ibl et al.\, Nature Communications 7\, 11763 (2016).        \n[3] T. Gissibl et al.\, Nature Photonics 10\, 554 (2016).   \n[4] S. Thiele et al.\, Opt. Lett. 41\, 3029 (2016).                 \n [5] S. Thiele et al.\, Science Advances 3\, e1602655 (2017)\; S. Fischbach et al.\, ACS Photonics 4\, 1327 (2017).           \n[6] M. Sar tison et al.\, Sci. Rep. 7\, 39916 (2017).             \n[7] M. Schmid et al.\, Opt. Lett. 43\, 5837 (2018).\n\nBio:\nHarald Giessen (* 1966) graduated from Kaiserslautern University with a diploma in Physics a nd obtained his M.S. and Ph.D. in Optical Sciences from the University of Arizona in 1995 as J.W. Fulbright scholar. After a postdoc at the Max-Plan ck-Institute for Solid State Research in Stuttgart he moved to Marburg as assistant professor. From 2001-2004\, he was associate professor at the Un iversity of Bonn. Since 2005\, he is full professor and holds the Chair fo r Ultrafast Nanooptics in the Department of Physics at the University of S tuttgart. He is also co-chair of the Stuttgart Center of Photonics Enginee ring\, SCoPE. He was guest researcher at the University of Cambridge\, and guest professor at the University of Innsbruck and the University of Sydn ey\, at A*Star\, Singapore\, as well as at Beijing University of Technolog y. He is associated researcher at the Center for Disruptive Photonic Techn ologies at Nanyang Technical University\, Singapore. He received an ERC Ad vanced Grant in 2012 for his work on complex nanoplasmonics. He was co-cha ir (2014) and chair (2016) of the Gordon Conference on Plasmonics and Nano photonics. He was general chair of the conference Photonics Europe (Strasb ourg 2018) and is co-chair of the biannual conference NanoMeta in Seefeld\ , Austria. He is on the advisory board of the journals "Advanced Optical M aterials"\, "Nanophotonics: The Journal"\, "ACS Photonics"\, "ACS Sensors" \, and "Advanced Photonics". He is a topical editor for ultrafast nanoopti cs\, plasmonics\, and ultrafast lasers and pulse generation of the journal "Light: Science & Applications" of Nature Publishing Group. He is a Fello w of the Optical Society of America. In 2018\, 2019\,2020 and 2021\, he wa s named „Highly Cited Researcher“ (top 1%) by the Institute of Scienti fic Information. In 2021\, he was elected as a Full Member into the Honor Society Sigma Xi. In 2021\, he was awarded the Gips-Schüle Research Prize together with Simon Thiele and Alois Herkommer for his pioneering work on 3D printed microoptics. His research interests include Ultrafast Nano-Opt ics\, Plasmonics\, Metamaterials\, 3D Printed Micro- and Nano-Optics\, Med ical Micro-Optics\, Miniature Endoscopy\, Novel mid-IR Ultrafast Laser Sou rces\, Applications in Microscopy\, Biology\, and Sensing.\n  LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u s/j/65093257313 STATUS:CONFIRMED END:VEVENT END:VCALENDAR