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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><img width=893 height=248 style='width:9.302in;height:2.5833in' id="image001.png_x0040_01DAC64E.DDE67E30" src="cid:image001.png@01DAC64E.DDE67E30"><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p></o:p></span></p><p class=MsoNormal>Vabimo vas na 4. predavanje iz sklopa »Kolokviji na IJS« v akademskem letu 2024/25, ki bo <b>danes, 11.</b> <b>decembra 2024, ob 13:00</b> v Veliki predavalnici Instituta »Jožef Stefan« na Jamovi cesti 39 v Ljubljani. Predavanje bo <b>v angleščini</b>.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span lang=EN-US style='font-size:16.0pt'>Feroelektrične nematske tekočine</span></b><b><span style='font-size:16.0pt'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:16.0pt'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span lang=EN-US style='font-size:12.0pt'>dr. Nerea Sebastián Ugarteche</span></u></b><b><u><span style='font-size:12.0pt'><o:p></o:p></span></u></b></p><p class=MsoNormal><i>Institut »Jožef Stefan«, Ljubljana, Slovenija<o:p></o:p></i></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nematski tekoči kristali so znani že desetletja in se široko uporabljajo v sodobnih prikazovalnih tehnologijah, kar predstavlja večmilijardni posel. Uporabni so zaradi edinstvene kombinacije fluidnosti, anizotropnih fizikalnih lastnosti in možnosti obdelave. Standardno nematsko stanje je enoosno in nepolarno. Čeprav je polarno različico že pred več kot stotimi leti predvidel M. Born, eksperimentalno ni bila uresničena vse do leta 2017. V predavanju bom podala pregled naših raziskav feroelektričnih nematskih materialov, pri čemer bom izpostavila njihove različne dielektrične, viskoelastične in optične lastnosti. Pomembne so predvsem njihove izjemno velike vrednosti optične susceptibilnosti drugega reda, saj odpirajo vznemirljive priložnosti za nelinearne fotonske aplikacije. Eden od obetavnih pristopov vključuje oblikovanje polarnih orientacijskih vzorcev s fotoporavnavo, s čimer je mogoče vplivati na nelinearno optično susceptibilnost materiala. Pokazala bom tudi, kako je za oblikovanje takšnih polarizacijskih vzorcev mogoče uporabiti fotovzorčenje z uporabo fleksoelektričnega učinka.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>O predavateljici</b>: Nerea Sebastián Ugarteche je višja znanstvena sodelavka na Institutu »Jožef Stefan«. Leta 2024 je prejela Blinčevo nagrado za vrhunske enkratne dosežke na področju fizike.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt'>Napovednik predavanja in posnetke preteklih predavanj najdete na <b>novi spletni strani »Kolokvijev na IJS«</b> </span><a href="https://kolokviji.ijs.si/"><span style='font-size:10.0pt'>https://kolokviji.ijs.si/</span></a><span style='font-size:10.0pt'>, posnetke pa tudi posebej na </span><a href="https://video.arnes.si/?q=Kolokviji_IJS"><span style='font-size:10.0pt'>https://video.arnes.si/?q=Kolokviji_IJS</span></a><span style='font-size:10.0pt'> (zadnje tri sezone) in </span><a href="http://videolectures.net/kolokviji_ijs"><span style='font-size:10.0pt'>http://videolectures.net/kolokviji_ijs</span></a><span style='font-size:10.0pt'> (starejši).<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>______________<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We invite you to the 4th lecture in the framework of »JSI Colloquia« in the academic year 2024/25, which will take place <b>today, December 11, 2024, at 1:00 PM</b> in the main lecture hall of Jožef Stefan Institute, Jamova cesta 39 in Ljubljana. The lecture will be held <b>in English</b>.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:16.0pt'>Ferroelectric nematic liquids<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:16.0pt'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span style='font-size:12.0pt'>Dr. </span></u></b><b><u><span lang=EN-US style='font-size:12.0pt'>Nerea Sebastián Ugarteche</span></u></b><b><u><span style='font-size:12.0pt'><o:p></o:p></span></u></b></p><p class=MsoNormal><i>Jožef Stefan Institute, Ljubljana, Slovenia<o:p></o:p></i></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nematic liquid crystals have been known for decades and are widely utilized in modern display technologies, constituting a multibillion-dollar business. Their applicability lies in a unique combination of fluidity, anisotropic physical properties<span lang=EN-US>,</span> and processability. The standard nematic state is uniaxial and non-polar. A polar counterpart was already envisioned more than a hundred years ago by M. Born, but it was<span lang=EN-US> not </span>experimentally realised until 2017. In this talk, I will provide an overview of our investigations into ferroelectric nematic materials, highlighting their distinct dielectric, viscoelastic and optical characteristics. Notably, their remarkably large second-order optical susceptibility values open exciting opportunities for non-linear photonic applications. One promising approach involves fabricating tailored polar orientational patterns via photoalignment, thus shaping the non-linear optical susceptibility of the material. I will also <span lang=EN-US>demonstrate </span>how photopatterning can be used to structure such polarization patterns by exploiting the flexoelectric effect.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>About the lecturer</b>: Nerea Sebastián Ugarteche is a senior research associate at the Jožef Stefan Institute. In 2024, she received the Blinc award for the extraordinary one-time achievement in the field of physics.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt'>The lecture trailer and recordings of past lectures can be found on the <b>new website of »JSI colloquia«</b></span> <a href="https://kolokviji.ijs.si/"><span style='font-size:10.0pt'>https://kolokviji.ijs.si/</span></a><span style='font-size:10.0pt'>, and recordings specifically at </span><a href="https://video.arnes.si/en/?q=Kolokviji_IJS"><span style='font-size:10.0pt'>https://video.arnes.si/en/?q=Kolokviji_IJS</span></a><span style='font-size:10.0pt'> (last three seasons) and </span><a href="http://videolectures.net/kolokviji_ijs"><span style='font-size:10.0pt'>http://videolectures.net/kolokviji_ijs</span></a><span style='font-size:10.0pt'> (older).<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p> </o:p></span></p></div></body></html>