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1 August 2021 Photo-initiator free two-photon polymerization using nonlinear deep-UV excitation
Katsumasa Fujita
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Proceedings Volume 11812, Molecular and Nano Machines IV; 118120F (2021) https://doi.org/10.1117/12.2595410
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Two-photon polymerization (TPP) enables us to fabricate three-dimensional structures with feature sizes beyond the diffraction limit. In TPP, since near-infrared femtosecond pulsed laser has been used for two-photon excitation, photo-initiators are added into a resin to trigger the TPP reaction. Here, we propose a photo-initiator free TPP by utilizing monomer’s intrinsic absorption in the deep-UV (DUV) region. Chemical bonds in monomer molecules are directly two-photon-excited with a visible femtosecond pulsed laser at 400-nm wavelength. We fabricated 3D nano-structures of acrylic oligomer, inorganic materials, and biomaterials without a photo-initiator. Raman spectroscopy study clarified chemical structure changes upon DUV two-photon excitation.
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Katsumasa Fujita "Photo-initiator free two-photon polymerization using nonlinear deep-UV excitation", Proc. SPIE 11812, Molecular and Nano Machines IV, 118120F (1 August 2021); https://doi.org/10.1117/12.2595410
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KEYWORDS
Deep ultraviolet
Absorption
Two photon polymerization
Femtosecond phenomena
Pulsed laser operation
Oscillators
Photopolymerization
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