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[IEEE 2019 IEEE CPMT Symposium Japan (ICSJ) - Kyoto, Japan (2019.11.18-2019.11.20)] 2019 IEEE CPMT Symposium Japan (ICSJ) - Polymer Optical Coupling Device with Single Mode Fiber for Silicon Photonics
摘要： Optical interconnect has attracted much attention as a possible solution to solve the bottleneck of conventional electric interconnect for realizing high bit rate transmission network. The optical interconnect requires high efficiency and easy optical coupling between optical wiring and optical fibers. Especially in these days, expansion of single mode fiber in optical interconnect and silicon photonics (SiPh) devices requires new coupling scheme between these devices. In this paper, we propose a novel coupling device which is composed with a microlens and a pillar having about 10?m diameter on the end face of SMF. This is fabricated by using self-written waveguide (SWW) method with UV-curable resin.
关键词： Self-Written Waveguide,Microlens,Silicon Photonics,UV-curable resin,Pillar,Optical Interconnection
更新于2025-09-23 15:21:01
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Isosorbide-based high performance UV-curable reactive diluents
摘要： In UV-curable coatings, a reactive diluent is mainly used to adjust the viscosity of the formula and participates in UV curing. However, it is still a great challenge to obtain a reactive diluent that has good diluting ability and good mechanical properties. In this study, isosorbide di(meth)acrylate (ISD(M)A) was designed and synthesized as a photocurable reactive diluent. The photo-polymerization kinetics of the reactive diluent were studied using real-time infrared spectroscopy. The diluting ability of reactive diluents in polyurethane acrylic (PUA) and epoxy acrylic (EA) were studied using a rheometer. Reactive diluent was mixed with PUA and EA to prepare a series of UV curable coatings, and the thermomechanical properties, mechanical properties, and basic coating properties of these coatings were evaluated. The results show that for both PUA and EA, ISD(M)A exhibits dilution capabilities similar to those of commercially available reactive diluents. The addition of 30 wt% reduces formula viscosity by three orders of magnitude, but the glass transition temperature (Tg) and pencil hardness of the ISDA-CN981 coating are 62.3 °C and 3H, respectively, which are higher than those of HDDA-CN981 (51.9 °C and 2 H). Moreover, the coatings that contain ISD(M)A have a higher storage modulus and good impact properties. In this work, good dilution ability of the active diluent and high mechanical properties of the coating were simultaneously achieved. These bio-renewable, UV-curable isosorbide-based reactive diluents show promise in green photocuring coatings.
关键词： UV-curable coating,isosorbide,Reactive diluent
更新于2025-09-23 15:21:01
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High-Resolution, High-Aspect-Ratio Printed and Plated Metal Conductors Utilizing Roll-to-Roll Microscale UV Imprinting with Prototype Imprinting Stamps
摘要： Micron-scale, high-aspect-ratio features were imprinted by a roll-to-roll process into a UV-curable polymer and used to create high-current-carrying conductive networks on plastic substrates. A stamp fabrication method was developed to create low-cost, rapidly produced roll-to-roll imprinting stamps, which can mold features from 3 μm to 1 mm wide. Isolated raised features 50 μm high were molded from a 25-μm-thick layer of UV-curable resin by displacing resin into raised features in the stamp. Substrates with imprinted capillary channels were used to form electrical conductors by printing a silver ink into reservoirs connected to the channels and allowing capillary flow to coat the channel. Copper electroless plating then filled the channels. The conductors demonstrate high resolution, high aspect ratio (～5:1 height:width), low resistance per length, and easy integration into networks. This roll-to-roll imprinting process provides a foundation for high-throughput manufacturing of high-resolution printed electronics.
关键词： high-aspect-ratio,conductive networks,roll-to-roll imprinting,UV-curable polymer,printed electronics
更新于2025-09-23 15:21:01
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Quasi-phase-matched third harmonic generation in organic multilayers
摘要： We report the first realization of quasi-phase-matched (QPM) third harmonic generation in isotropic polymer films. Spin-coated thin films of ethyl-violet molecules dispersed in a polymer host (EV) were used as cubic nonlinear optical media because of their transparency at both the fundamental (1230 nm) and the third harmonic (410 nm) wavelengths. A passive layer of a UV-curable material was formed to compensate the phase shift between the two light waves after propagating through each EV layer. We fabricated a series of samples with 1~4 EV layers (0~3 alternatingly coated passive layers). The third harmonic output power showed a quadratic increase with the number of layers, providing a strong evidence for successful quasi-phase-matching. A conversion efficiency of 0.15% was observed with a 190 fs pulse input.
关键词： third harmonic generation,ethyl-violet molecules,quasi-phase-matched,isotropic polymer films,UV-curable material
更新于2025-09-23 15:21:01
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Photocuring of Radically Polymerizable Hyperbranched Polymers Having Degradable Linkages
摘要： Hyperbranched polymers having a number of reductive disulfide bonds and radically reactive vinyl groups were synthesized by the bulk radical homopolymerization of bis(2-methacryloyloxyethyl)disulfide (disulfide based dimethacrylate, DSDMA) as a divinyl monomer in the presence of methyl 2-(bromomethyl)acrylate as an addition-fragmentation chain transfer agent. The resulting hyperbranched polymers (HB-DSDMAs) were photocured by irradiated at 365 nm in the presence of 2,2-dimethoxy-2-phenylacetophenone as a photo radical initiator. The photocured HB-DSDMA exhibited high transparency in the visible region and good solvent resistance for various organic solvents. Reduction of the disulfide groups smoothly proceeded in the presence of tributylphosphine as a reductant, and the cured HB-DSDMAs were completely solubilized. HB-DSDMAs were also photocured by irradiation at 254 nm due to the homolysis of the disulfide groups with subsequent initiation of the radical polymerization.
关键词： Photo cleavage,Reductive decomposition,Hyperbranched,Degradable,Curable,polymer,Photopolymerization
更新于2025-09-19 17:15:36
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Direct measurement of electrostatic interactions between poly(methyl methacrylate) microspheres with optical laser tweezers
摘要： In this study, we measured the force of electrostatic interactions between poly(methyl methacrylate) (PMMA) particles dispersed in organic solvent mixtures of cyclohexyl bromide (CHB) and n-decane. Optical laser tweezers were employed to directly measure interactive forces between paired PMMA particles in a CHB medium that contained n-decane in various volume ratios. CHB, having a moderate dielectric constant, provided an environment with a high charge storage capacity. The addition of n-decane lowered the effective refractive index of the medium, which increased the optical trapping efficiency. We also fabricated microscope flow cells with a commonly used UV-curable adhesive and quantified the effects of dissolved adhesive compounds through interactive force measurements and nuclear magnetic resonance analysis. In addition, we studied the impact of CHB dissociation into H+ and Br? ions, which could screen electrostatic interactions.
关键词： UV-curable adhesive,NMR analysis,electrostatic interactions,optical laser tweezers,CHB,PMMA particles,n-decane
更新于2025-09-16 10:30:52
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UV-Curable Nanoimprint resist with Liquid Volume-Expanding Monomers
摘要： For ultraviolet nanoimprint lithography (UV-NIL), the resist volume shrinkage during curing not only influences the pattern fidelity but also induces defects in the demolding process due to strong adhesion. To address this issue, a novel nanoimprint resist was formulated and characterized in this work. The new resist formulation contains 3,9-diethyl- 3,9-bis(allyloxymethyl)-1,5,7,11- tetraoxastetraoxaspiro [5,5] undecane (DB-TOSU), which is a liquid spiro-orthocarbonate monomer that undergoes volume expansion upon acid-catalyzed polymerization. By mixing DB-TOSU with conventional volume-shrinking epoxy monomers at various weight ratios, the formulated resists had much reduced or even zero volume shrinkage. The resist volume shrinkage, elastic modulus, and demolding force decreased with increasing DB-TOSU weight ratio in resist formulation. When DB-TOSU reached 50 wt.%, the demolding force was reduced by 69% with an adequate elastic modulus (75 MPa) and low shrinkage (1.86%). This novel resist formulation has the potential to allow high-fidelity pattern replication and reduce demolding defects in UV-NIL.
关键词： surface patterning,resist,UV-curable,nanoimprint,adhesion
更新于2025-09-09 09:28:46
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Influence of silane coupling agent on the properties of UV curable SiO2-PMMA hybrid nanocomposite
摘要： This work reports the preparation of UV-curable organic–inorganic hybrid nanocomposites synthetized by sol–gel method with the aim of obtaining highly transparent anti-abrasive coatings with long-term storage and stability for the protection of organic light emitting diodes (OLEDs). The inorganic phase is composed of tetraethoxysilane (TEOS) condensed under acid catalysis and mixed with tetrafunctional acrylate monomer and oligomer. Vinyltriethoxysilane (VTES), 3-methacryloxypropyltrimethoxysilane (MEMO), and 3-mercaptopropyltriethoxysilane (MTMO) are used as silane coupling agent and hybrid network modifier. Among the various parameters influencing the structure and properties of the hybrid, this work focuses on the nature and amount of coupling agent and their influence in terms of transparency, mechanical properties, and stability of the formulation. An optimum can be found in the silica to coupling agent ratio. Low level of functionalization leads to hybrids displaying poor optical performances and stability due to the coalescence of silica domains. On the contrary, an excess of functionalization reduces the abrasion resistance and the silica network formation. Changing the organic pendant of coupling agents greatly influences the properties of the coating by promoting the organic–inorganic balance. Dense and flexible as well as mechanically resistant coatings can be obtained from similar formulation by simply tuning the nature of the coupling agent depending of the needs of the application.
关键词： Sol–gel,Abrasion resistance,Nanocomposite,Hybrid coatings,UV-curable
更新于2025-09-04 15:30:14