Improvement of spatial resolution in nano-stereolithography using radical quencher

Park, Sang-Hu; Lim, Tae Woo; Yang, Dong; Kim, Ran Hee; Lee, Kwang Sup

doi:10.1007/bf03218724

Cited by 63 publications

(29 citation statements)

References 13 publications

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“…From the very beginning [2], DLW has been used to produce sub-wavelength feature sizes. During the last decade, the impact of several experimental parameters has been examined in order to increase the photoresists' resolution [5,6,7,8,9]. While improved feature sizes have been demonstrated using a photoresist with higher sensitivity [6] other results have indicated that completely unsensitized photoresists offer the smallest features [8].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional multi-photon direct laser writing with variable repetition rate

Fischer¹,

Mueller²,

Kaschke³

et al. 2013

Opt. Express

155

141

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Abstract:We perform multi-photon direct laser writing as a function of laser repetition rate over many orders of magnitude and otherwise unchanged experimental conditions. These new data serve as basis for investigating the influence of different proposed mechanisms involved in the photopolymerization: two-photon absorption, photoionization, avalanche ionization and heat accumulation. We find different non-linearities for high and low repetition rates consistent with different initiation processes being involved. The scaling of the resulting linewidths, however, is neither expected nor found to depend on repetition rate or non-linearity. References and links1. H. B. Sun, S. Matsuo, and H. Misawa, "Three-dimensional photonic crystal structures achieved with two-photonabsorption photopolymerization of resin," Appl. Phys. Lett. 74, 786-788 (1999). 2. S. Kawata, H. B. Sun, T. Tanaka, and K. Takada, "Finer features for functional microdevices," Nature 412, 697-698 (2001). 3. M. Straub and M. Gu, "Near-infrared photonic crystals with higher-order bandgaps generated by two-photon photopolymerization," Opt. Lett. 27, 1824Lett. 27, -1826Lett. 27, (2002

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Section: Introductionmentioning

confidence: 99%

Three-dimensional multi-photon direct laser writing with variable repetition rate

Fischer¹,

Mueller²,

Kaschke³

et al. 2013

Opt. Express

155

141

View full text Add to dashboard Cite

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“…Due to quadratic dependence on light intensity, polymerization reaction is induced in tiny focused volume of monomer that allows formation of microstructures in 3D space [12]. It has been already recognized as an effective method for fabricating 3D optoelectronic devices, photonic crystals, micromechanical components, etc.…”

Section: Introductionmentioning

confidence: 99%

3D artificial polymeric scaffolds for stem cell growth fabricated by femtosecond laser

Malinauskas

Danilevičius²,

Baltriukienė³

et al. 2010

Lithuanian J. Phys.

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Femtosecond Laser Induced Polymerization is an attractive direct writing technique for rapid three-dimensional (3D) micro and nanofabrication in diverse applications. Recently, it has been successfully applied for 3D scaffold fabrication required in biomedicine applications. However, there are still a lot of investigations to be done before it can be used for practical applications in tissue engineering or regenerative medicine. In this work, experimental results on production of artificial polymeric scaffolds for stem cell growth are presented. Parameters (average laser power, sample scanning speed, and developing conditions) for microfabrication in biocompatible photopolymers AKRE (AKRE37) and ORMOSIL (SZ2080) are experimentally determined. 3D custom form and size artificial scaffolds were successfully microfabricated. Adult stem cell growth on them was investigated in order to test their biocompatibility. The results of myogenic stem cell culture expansion were compared to the control growth of the same cells on the scaffolds manufactured out of commonly used biocompatible photopolymers ORMOCER (Ormocore b59) and Poly-Ethylen Glycol Di-Acrylate (PEG-DA-258). Preliminary results show FLIP technique to have potential in fabrication of artificial 3D polymeric scaffolds for cell proliferation experiments. These are the first steps in transferring FLIP fabrication method from laboratory tests to flexible manufacturing of individual scaffolds out of biocompatible and biodegradable polymers.

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“…Recently, various research studies have reported the reduction of the lateral feature size, reaching less than 100 nm, by intentionally introducing radical quenchers into photocurable resins. Takada et al [44] reduced the feature size down to about 65 nm, and Park et al [45] revealed line patterns that are around 95 nm wide. They demonstrated the tendency of voxel-size reduction by increasing the amount of radical quenchers in a resin.…”

Section: What Is the End Of The Smallest Feature Size In Tps?mentioning

confidence: 99%

“…Therefore, by adding a radical quencher, the voxel-size reduction causes the low mechanical strength of a polymerized structure due to its low molecular weight. As such, a microstructure with a low mechanical strength is easily distorted by the surface tension of a rinsing material in a developing process [45].…”

Section: What Is the End Of The Smallest Feature Size In Tps?mentioning

confidence: 99%

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Two‐photon stereolithography for realizing ultraprecise three‐dimensional nano/microdevices

Park

Yang

Lee³

2009

Laser & Photonics Reviews

209

104

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Two-photon stereolithography (TPS) provides many advantages for achieving two-dimensional (2D) and threedimensional (3D) micrometer-scale polymeric, ceramic and metallic structures applicable to complicated optical and neoelectronic microdevices. In the fabrication of high-resolution 3D microstructures, TPS has significant advantages over conventional microelectromechanical system (MEMS) processing, which involves time-consuming multistep indirect fabrication processes. Many studies have recently been made to develop and improve the TPS process, focusing on creating greater efficiency, higher resolution, and greater productivity, which are essential requirements of a practical TPS process. For the first time, an artistic microstructure has recently been successfully produced with an ultraprecise spatial resolution, sub-30 nm nanofibers, 3D multilayer imprint stamps for mass production, and ceramic 3D microstructures. In this review, we report the progress of twophoton polymerization based on 3D microfabrication, including the results obtained from the original research. This report is presented in three sections: improvement of resolution, precise design schemes, and applications of 3D microstructures.Precise micro 3D pattern fabricated by two-photon lithography.

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Improvement of spatial resolution in nano-stereolithography using radical quencher

Cited by 63 publications

References 13 publications

Three-dimensional multi-photon direct laser writing with variable repetition rate

Three-dimensional multi-photon direct laser writing with variable repetition rate

3D artificial polymeric scaffolds for stem cell growth fabricated by femtosecond laser

Two‐photon stereolithography for realizing ultraprecise three‐dimensional nano/microdevices

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