20.500.12556/RUL-154412 Surface alignment of nematic liquid crystals by direct laser writing of photopolymer alignment layers We demonstrate the fabrication of good quality surface alignment layers on glass by Direct Laser Writing method using a 2-photon polymerisation technique. We use commercially available photosensitive resins to print alignment layers by scanning the focal point of a femtosecond laser near the resin-glass interface. This results in down to ~ 100 nm thin alignment layers that provide good planar anchoring of 5CB and MLC13300, with the easy axis of alignment along the scanning direction. The azimuthal anchoring strength is ~ 5 × 10$^{−6}$ J/m$^2$ and is an order of magnitude weaker compared to commercial rubbed polyimide alignment layer. The threshold voltage for Fréedericksz transition in a 90° twisted nematic cell is slightly increased compared to conventional rubbed polyimide for printed alignment layers. The turn-on switching time is longer for printed layers compared to polyimide alignment layers, whereas the turn-off time is shorter for printed alignment layers. The advantage of this new method is in its flexibility, as we demonstrate printing of complex surface alignment patterns with alignment layer thickness below 100 nm. 3D printing direct laser writing alignment layer surface patterning 3D tiskanje neposredno lasersko pisanje poravnalni sloj površinsko vzorčenje true false true Angleški jezik Slovenski jezik Članek v reviji 2024-02-13 15:02:53 2024-02-13 15:02:55 2024-02-14 03:46:39 0000-00-00 00:00:00 2023 0 0 Str. 1999–2009 no. 13/14 Vol. 50 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 53 1366-5855 10.1080/02678292.2023.2242297 162068483 Surface_alignment_of_nematic_liquid_crystals_by_direct_laser_writing_of_photopolymer_alignment_layers.pdf Surface_alignment_of_nematic_liquid_crystals_by_direct_laser_writing_of_photopolymer_alignment_layers.pdf 1 5A9EC750F6E0DE18B204027D5B529939 ddefec3932766cade21300ff98157baa68f3dff95e7f449a92f4f77a135eb4c8 d9d23e0b-ca78-11ee-a430-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180830 https://www.tandfonline.com/doi/full/10.1080/02678292.2023.2242297 0 c559c66d-ca78-11ee-a430-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180829 Fakulteta za matematiko in fiziko 0 0 0