High-speed multiphoton absorption polymerization: fabrication of microfluidic channels with arbitrary cross-sections and high aspect ratios

Kumi, George; Yanez, Ciceron O.; Belfield, Kevin D.; Fourkas, John T.

doi:10.1039/b923377f

Cited by 127 publications

(82 citation statements)

References 33 publications

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“…Processes related to two-photon absorption (2PA) have attracted attention in recent years owing to diverse applications in various fields, such as photodynamic therapy [1,2], optical-limiting [3][4][5], optical data storage [6,7], upconversion lasing [8,9], 3D microfabrication [10,11] and two-photon excited fluorescence microscopy [12,13]. 2PA occurs when molecules are exposed to intense laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Two-photon absorption properties of a novel class of triarylamine compounds

Piovesan

Boni

Ishow

et al. 2010

Chemical Physics Letters

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a b s t r a c tTwo-photon absorption spectra of a triarylamine compounds dissolved in toluene were measured using the well-known Z-scan technique, employing 120-fs laser pulse-width. According to the results, an extra band located at around 900 nm was observed only for triarylamine with azoaromatic units. On the other hand, a shift in the two-photon absorption band for triarylamine, with and without azoaromatic units, is observed when different electron donor/acceptors groups are changed. The fitting of the spectra, using sum-over-states model, allowed us to obtain the spectroscopic parameters of each molecule, which appears to be in reasonable agreement with molecules presenting similar structural moieties.

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Section: Introductionmentioning

confidence: 99%

Two-photon absorption properties of a novel class of triarylamine compounds

Piovesan

Boni

Ishow

et al. 2010

Chemical Physics Letters

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“…It is a negative-tone resist consisting of epoxy oligomers and a low concentration of a photoacid generator (PAG). J. T. Fourkas et al have developed the fabrication of microfluidic channels with arbitrary cross sections and high aspect ratios [23]. The authors demonstrate that by employing a novel PAG in an SU8 resist for MPP, high-aspect-ratio masters with uniform, rectangular cross sections can be produced.…”

Section: Multiphoton Polymerizationmentioning

confidence: 97%

“…Scale bars are 100 μm. Reproduced from [23] by permission of the Royal Society of Chemistry micromachine that may be placed in blood vessels for health care. Therefore, it is of great importance to find novel fabricative and driven techniques for making functional micro/nanomachines with precise motion control.…”

Section: Multiphoton Polymerizationmentioning

confidence: 99%

Multiphoton Process in Nanofabrication and Microscopy Imaging

Zheng

Duan

2014

Nano-Optics and Nanophotonics

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Under the intense intensity of femtosecond laser pulse, various nonlinear optical effects between laser and matter can occur. Among them, one nonlinear optical effect, multiphoton absorption (MPA), is easily induced by femtosecond laser pulse, which provides an opportunity to achieve the spatial resolution smaller than optical diffraction limit. Multiphoton process using femtosecond laser has provided a powerful technique for fabricating three-dimensional (3D) micro/nanostructures and microscopy imaging due to its intrinsic 3D penetration depth and high spatial resolution at nanometric scale. As an emerging micro/nanofabrication technique, multiphoton polymerization (MPP) based on multiphoton process has been used in fabricating various micromachines and microdevices with conventional photoresists and polymer nanocomposites, such as microneedles, micropumps, microgear sets, and 3D photonic crystals. Aside from MPP based on multiphoton process, microscopy imaging is another research field employing multiphoton process. Two-photon-excited fluorescence (TPEF) microscopy, an established nonlinear microscopy technique, is more practically useful for noninvasive live cell imaging because of the deeper penetration, less photobleaching, and higher spatial resolution. Second-harmonic generation (SHG) is a nonlinear optical process, in which photons with the same frequency interacting with a nonlinear material are effectively "combined" to generate new photons with twice the energy, and therefore twice the frequency and half the wavelength of the initial photons. SHG, as an even-order nonlinear optical effect, is only allowed in

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“…Cationic photoresists are typifi ed by epoxies, such as SU-8 (Kumi et al , 2010;Witzgall et al , 1998). Cationic polymerization in MAP begins with the excitation of photoacid generator (PAG).…”

confidence: 99%

Multiphoton lithography, processing and fabrication of photonic structures

Fourkas

2012

Laser Growth and Processing of Photonic Devices

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High-speed multiphoton absorption polymerization: fabrication of microfluidic channels with arbitrary cross-sections and high aspect ratios

Cited by 127 publications

References 33 publications

Two-photon absorption properties of a novel class of triarylamine compounds

Two-photon absorption properties of a novel class of triarylamine compounds

Multiphoton Process in Nanofabrication and Microscopy Imaging

Multiphoton lithography, processing and fabrication of photonic structures

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