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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Femtosecond Laser Micromachining for Controlling Surface Wettability
摘要： The use of femtosecond laser to modify the surface of polymeric materials has received great attention in the last decade, due to the possibilities of tailoring the material’s properties yielding technological applications. Here, we report on the microfabrication of an azopolymer by using femtosecond laser pulses, aiming at the control of surface wettability. By properly patterning the polymeric surface structure we were able to increase the surface hydrophilicity, decreasing the water contact angle in about 20 degrees.
关键词： Laser ablation,hydrophilicity,femtosecond micromachining,azopolymer
更新于2025-09-16 10:30:52
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Athermal and Soft Multi‐Nanopattern of Azopolymer Enabled by Phototunable Mechanics
摘要： Imprinting nanopatterns on flexible substrates has diverse applications in advanced fabrication. However, the traditional thermal nanoimprint lithography (T-NIL) often causes shrinkage upon cooling. Although this can be partly avoided by employing ultraviolet-curable nanoimprint lithography (UV-NIL), it is still difficult to generate multiple and rewritable nanopatterns. Here, a simple yet versatile method is introduced to fabricate multiple nanopatterns on flexible substrate coated with azopolymer by combining athermal nanoimprint lithography (AT-NIL) and photolithography. The azopolymer is chosen as the surface coating due to its intriguing variability of mechanical properties upon photoirradiation, which includes: (1) phototunable glass transition temperatures (Tgs) and concomitantly photoinduced switch from glassy plastic to viscoplastic polymer; (2) prominent modulation of viscoplasticity under light illumination at different wavelengths. Regionally-selective multiple nanopatterns are conveniently fabricated, presenting angle-dependent structural-color images on poly(ethylene terephthalate) (PET) substrates. The flexible, athermal and multiple nanopatterning method may provide enlightenment for on-demand fabrication of complex nanopatterns.
关键词： multiple nanopatterns,azobenzene-containing polymer (azopolymer),phototunable mechanics,athermal imprint lithography,flexible nanopatterns
更新于2025-09-12 10:27:22
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Athermal and Soft Multi-Nanopattern of Azopolymer Enabled by Phototunable Mechanics
摘要： Imprinting nanopatterns on flexible substrates has diverse applications in advanced fabrication. However, the traditional thermal nanoimprint lithography (T-NIL) often causes shrinkage upon cooling. Although this can be partly avoided by employing ultraviolet-curable nanoimprint lithography (UV-NIL), it is still difficult to generate multiple and rewritable nanopatterns. Here, a simple yet versatile method is introduced to fabricate multiple nanopatterns on flexible substrate coated with azopolymer by combining athermal nanoimprint lithography (AT-NIL) and photolithography. The azopolymer is chosen as the surface coating due to its intriguing variability of mechanical properties upon photoirradiation, which includes: (1) phototunable glass transition temperatures (Tgs) and concomitantly photoinduced switch from glassy plastic to viscoplastic polymer; (2) prominent modulation of viscoplasticity under light illumination at different wavelengths. Regionally-selective multiple nanopatterns are conveniently fabricated, presenting angle-dependent structural-color images on poly(ethylene terephthalate) (PET) substrates. The flexible, athermal and multiple nanopatterning method may provide enlightenment for on-demand fabrication of complex nanopatterns.
关键词： multiple nanopatterns,azobenzene-containing polymer (azopolymer),phototunable mechanics,athermal imprint lithography,flexible nanopatterns
更新于2025-09-12 10:27:22
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Programmable Fabrication of Submicrometer Bent Pillar Structures Enabled by a Photoreconfigurable Azopolymer
摘要： Anisotropic small structures found throughout living nature have unique functionalities as seen by Gecko lizards. Here, we present a simple yet programmable method for fabricating anisotropic, sub-micron-sized bent pillar structures using photo-reconfiguration of an azopolymer. Slant irradiation of a p-polarized light on the pillar structure of an azopolymer simply results in a bent pillar structure. By combining the field-gradient effect and directionality of photo-fluidization, control of the bending shape and the curvature is achieved. With the bent pillar patterned surface, anisotropic wetting and directional adhesion are demonstrated. Moreover, the bent pillar structures can be transferred to other polymers, highlighting the practical importance of this method. We believe that this pragmatic method to fabricate bent pillars can be used in a reliable manner for many applications requiring the systematic variation of a bent pillar structure.
关键词： azopolymer,photo-reconfiguration,directional dry adhesive,bent pillar,anisotropic wetting
更新于2025-09-11 14:15:04