Mehrphotonen‐Mikrofabrikation

LaFratta, Christopher N.; Fourkas, John T.; Baldacchini, Tommaso; Farrer, Richard A.

doi:10.1002/ange.200603995

Cited by 56 publications

(39 citation statements)

References 166 publications

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“…To the best of our knowledge, this resolution is one of the best values that are currently possible with multiphoton fabrication. [12] Vibrational Raman spectroscopy is a powerful tool for the qualitative analysis of biological molecules and provides information about their structure and interactions. The technique does not suffer from rapid photobleaching as is often the case for fluorecence measurements.…”

Section: à2mentioning

confidence: 99%

SERS and Multiphoton‐Induced Luminescence of Gold Micro‐ and Nanostructures Fabricated by NIR Femtosecond‐Laser Irradiation

et al. 2008

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In contrast to almost non-luminescent bulk gold with a photoluminescence (PL) quantum yield of merely 10 À10 , [1] rod-shaped gold nanoparticles [2] as well as gold clusters consisting of only a few atoms [3,4] exhibit fascinating size-and shape-dependent luminescence properties with over one-million-times enhanced quantum yields. Furthermore, our group could show that gold nanoparticles embedded in glassy nanolayers show a bright multiphoton-induced (nonlinear) luminescence.[5] Although this phenomenon as such has been published in detail previously, [5] possible applications have not been reported so far. The described multiphoton-induced luminescence is indeed very promising due to the excitation of the light emission by nearinfrared (NIR) photons. The low tissue autofluorescence and the deep penetration depth of light waves into the tissues in the NIR spectral range make the particles excellent candidates for contrast reagents in the field of biological imaging. A second major advantage of using gold is that it is non-toxic and superior for bio-labeling as it can be easily functionalized with diverse compounds by the reaction with thiolates and other organic molecules. In addition, gold nanoparticles have attracted much attention in ex-vivo and in-vivo biological imaging due to the surface-enhanced Raman scattering (SERS) effect of adsorbed molecules. [6,7] For the utilization of gold nanoparticles as luminescence and SERS sensor materials and especially for trace analysis, a simple, fast and reproducible technique for the production of SERS-active and luminescent substrates is necessary. [8,9] Furthermore, the mean particle size, the size distribution and the spatial arrangement of nanoparticles must fulfill certain criteria for optimum SERS enhancement.[10] As an additional requirement for analytical applications the particles should be very stable towards any kinds of solvents. An ideal SERS-active substrate should be usable more than once since the analyte molecules can be washed away after the detection without damaging the substrate. Herein, we introduce an efficient and facile chemical sol-gel derived technique to generate gold nanoparticles in glassy silicate-titanium nanolayers by titaniumdoped sapphire (Ti:Sa) femtosecond(fs)-laser activation. Our new laser scanning microscope (LSM) and surface-electron microscopy (SEM) data support our previous findings and clearly demonstrate that well-defined micro-and nano-patterns of gold nanoparticles can be fabricated over extended areas on stable films by employing a confocal LSM, thus showing the ease and feasibility of this method for "real world" applications. This procedure is fast and straightforward. The partially embedded or tethered gold nanoparticles are stable and show a multiphoton NIR excited photoluminescence (PL). The PL is helpful for directly visualizing (or imaging) the gold nanostructures. It might become very useful for detecting reporter molecules in combination with SERS. Additionally, we show that the luminescent gold nanoparticle films...

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Section: à2mentioning

confidence: 99%

SERS and Multiphoton‐Induced Luminescence of Gold Micro‐ and Nanostructures Fabricated by NIR Femtosecond‐Laser Irradiation

et al. 2008

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“…Gegenwärtig herrscht ein großer Bedarf an effizienten 2PA-Farbstoffen für eine breite Anwendungspalette, die von der Mikroskopie [5,6] und Mikrofabrikation [7] über dreidimensionale Datenspeicher, [8,9] optische Leistungsbegrenzung, [10] Upconversion-Laser [11] und photodynamische Therapie [12] bis hin zur lokalisierten Freisetzung biologisch aktiver Spezies reicht. [13] Kürzlich ist es durch Fortschritte beim Design und der Synthese von 2PA-Farbstoffen gelungen, diesem Bedarf nachzukommen.…”

Section: Einführungunclassified

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

et al. 2009

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Zwei Photonen sind besser als eines – dieser Grundsatz gilt für einen großen Bereich von Anwendungen von den Ingenieurwissenschaften bis hin zur Physiologie. Durch Fortschritte beim Verständnis des Phänomens der Zweiphotonenabsorption und bei der Entwicklung von Zweiphotonenfarbstoffen gewinnt das Forschungsgebiet schnell an Bedeutung.magnified imageGegenüber der herkömmlichen Einphotonenabsorption bietet die Zweiphotonenabsorption etliche Vorteile, die zu Anwendungen in der Mikroskopie und Mikrofabrikation, der optischen Leistungsbegrenzung, in Upconversion‐Lasern und dreidimensionalen Datenspeichern, der photodynamischen Therapie und der lokalisierten Freisetzung biologisch aktiver Spezies geführt haben. Diese Anwendungen haben wiederum die Entwicklung neuartiger Farbstoffe mit großen Zweiphotonenabsorptionsquerschnitten vorangetrieben. Dieser Aufsatz beginnt mit den theoretischen Grundlagen der Zweiphotonenabsorption, stellt die Vielfalt möglicher Anwendungen vor und beschreibt erste Struktur‐Eigenschafts‐Beziehungen, die als Leitlinien bei der Entwicklung effizienter Zweiphotonenfarbstoffe dienen können.

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“…[2] However, as we reach the technological limits of miniaturisation of these "top-down" approaches, a conceptual shift is now occurring in the field to reproducibly assemble photoactive materials in the sub-50 nm regime.…”

Section: Introductionmentioning

confidence: 99%

DNA‐Templated Photonic Arrays and Assemblies: Design Principles and Future Opportunities

Bonnard

Burley

2011

Chemistry A European J

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Molecular photonics is a rapidly developing and multi-disciplinary field of research involving the construction of molecular assemblies comprising photoactive building blocks that are responsive to a light stimulus. A salient challenge in this field is the controlled assembly of these building blocks with nanoscale precision. DNA exhibits considerable promise as an architecture for the templated assembly of photoactive materials. In this Concept Article we describe the progress that has been made in the area of DNA photonics, in which DNA acts as a platform for the construction of optoelectronic assemblies, thin films and devices.

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Mehrphotonen‐Mikrofabrikation

Cited by 56 publications

References 166 publications

SERS and Multiphoton‐Induced Luminescence of Gold Micro‐ and Nanostructures Fabricated by NIR Femtosecond‐Laser Irradiation

SERS and Multiphoton‐Induced Luminescence of Gold Micro‐ and Nanostructures Fabricated by NIR Femtosecond‐Laser Irradiation

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

DNA‐Templated Photonic Arrays and Assemblies: Design Principles and Future Opportunities

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