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SUMMARY:POB Seminar -  Single-photon-assisted two-photon polymerization (C
 hristmas Special)
DTSTART:20241212T181500
DTSTAMP:20260404T012244Z
UID:14b93eb048c923b6a3a4831d0834832a3ee26bfc9c5351a6500d21d3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Buse Unlu\nThe EPFL Photonics Chapter (EPC) is very pleased 
 to announce and cordially invite you to our monthly ‘Pizza-Optics-Beer
 ’ (POB) seminar on December 12th\, at 18:15 in room CO 016.\n\n\n
 This month we will have the pleasure to host Buse Unlu - doctoral assist
 ant in Laboratory of Applied Photonics Devices with the presentation entit
 led:\n\n        "Single-photon-assisted two-photon polymerization"
 \n\n\nIn this special edition\, we are offering freshly cooked mulled wine
  following the pizza.\n\nFor organizational purposes (if you want to eat 
 pizza!)\, please confirm your participation using this Doodle.\nDon’t 
 hesitate to extend the invitation to any postdoc and colleague!\n\nHope to
  see you there\,\nThe team of the EPFL Photonics Chapter\n\n\n\nAbstract:\
 nPhotopolymerization is a light-based additive manufacturing technique tha
 t facilitates the fabrication of complex 3D structures quickly and cost-ef
 fectively. One-photon polymerization allows printing with high speed despi
 te its limited resolution. In contrast\, two-photon polymerization (2PP) o
 ffers high precision and resolution but requires longer printing times. We
  propose a method combining 2PP and one-photon absorption (1PA) to take ad
 vantage of the dual capabilities\, allowing for faster printing while pres
 erving high resolution and enhancing depth sectioning. In this study\, we 
 employ blue light to pre-excite a photocurable resin for rapidly reaching 
 the polymerization threshold by 1PA and a precisely focused femtosecond (f
 s) beam to provide the missing energy for surpassing the threshold and sol
 idifying the resin through two-photon absorption. First\, we investigate t
 he impact of the pre-sensitization by a blue light illumination on 2PP\, d
 emonstrating the effect on voxel growth dynamics. After that\, we introdu
 ce a custom 3D printer utilizing blue light sensitization in a light-she
 et configuration on 2PP. We report printed 3D objects for which the aver
 age fs laser power was reduced by 28.6 % and the exposure time was reduc
 ed by a factor of two compared with polymerization performed only with the
  fs laser beam. Additionally\, a 63 % improvement in axial voxel size wa
 s attained through blue light-sheet pre-sensitization.\n\n\nYou don't know
  POBs?\nPOBs (Pizza-Optics-Beer) are monthly seminars organized by the stu
 dent association EPFL Photonics Chapter.\nA PhD or a postdoc gives a 20-mi
 nutes presentation about his/her research in photonics. Discussions contin
 ue informally around pizza and beers!\nThe event is free and open to anyon
 e.\n\nIf you want to receive our newsletter (events\, updates\, and more..
 .)\n\n© 2024 EPFL\n\nWe thank the Doctoral Program in Photonics (EPDO)\, 
 the Society of Photo-Optical Instrumentation Engineers (SPIE.)\, Optica
  and SwissPhotonics for their support.\n 
LOCATION:CO 016 https://plan.epfl.ch/?room==CO%20016
STATUS:CONFIRMED
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