Towards nanostructuring with femtosecond laser pulses

Korte, Frank; Serbin, Jesper; Koch, Jürgen; Egbert, A.; Fallnich, Carsten; Ostendorf, Andreas; Chichkov, Boris N.

doi:10.1007/s00339-003-2110-z

Cited by 249 publications

(106 citation statements)

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“…Rapid progress of femtosecond laser systems and unique characteristics of ultrashort laser pulses open up new possibilities for high‐precision contact‐free material micromachining. Direct femtosecond laser ablation enables fabrication of high‐quality structures in almost all solid materials with a resolution down to 100 nm 13. This technology is especially suitable for small‐scale manufacturing applications.…”

Section: Discussionmentioning

confidence: 99%

Differential fine‐tuning of cochlear implant material–cell interactions by femtosecond laser microstructuring

et al. 2008

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Cochlear implants (CIs) can restore hearing in deaf patients by electrical stimulation of the auditory nerve. To optimize the electrical stimulation, the number of independent channels must be increased by reduction of connective tissue growth on the electrode surface and selective neuronal cell contact. The femtosecond laser microstructuring of the electrode surfaces was performed to investigate the effect of fibroblast growth on the implant material. A cell culture model system was established to evaluate cell-material interactions on these microstructured CI-electrode materials. Fibroblasts were used as a cell culture model for connective tissue formation, and differentiating neuronal-like cells were employed to represent neuronal cells. For nondestructive microscopic examination of living cells on the structured surfaces, the cells were genetically modified to express green fluorescent protein. To investigate the special interaction between the electrode material and the tissue we used electrode material which is originally used for manufacturing CI for human applications, namely platinum (contact material) and silicone carrier material (LSR 30, HCRP 50). Microstructures of various dimensions (groove width 1-10 microm) were generated by using femtosecond laser ablation. The highest fibroblast growth rate was observed on platinum, but cell growth rates on the silicone carrier material were lower. Microstructuring reduced fibroblast cell growth on platinum significantly. On the microstructured silicone, a trend to lower cell growth rates was observed. In addition, microgrooves on platinum surfaces can direct neurite outgrowth parallel to the grooves. The implications of the results are discussed with respect to the design of a microstructured CI surface.

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Section: Discussionmentioning

confidence: 99%

Differential fine‐tuning of cochlear implant material–cell interactions by femtosecond laser microstructuring

et al. 2008

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“…As the g 1 grating forms, the excitation of SPPs propagating in the opposite directions becomes resonant with positive feedback via the grating amplitude h. With increasing number of laser shots, h grows, and this enhances the intensity of the SPPs. When I s becomes larger I las , the third term, which describes the interference between SPPs propagating in the opposite directions, becomes dominant in the relation (3). The interference between SPPs and also the interference between the second spatial harmonic of the SPP and incident laser wave result in the formation of degenerated periodic structures with the period d = λ las /2η.…”

Section: Laser and Photonics Reviewsmentioning

confidence: 99%

“…Li et al [133] have found that femtosecond laser nanostructuring of Al in air increases the thickness of oxide film and the content of alpha crystalline aluminum oxide (αAl 2 O 3 ). Furthermore, X-ray photoelectron spectroscopy and X-ray diffraction analysis showed the formation of crystalline anorthic Al(OH) 3 . At low laser fluence, the surface morphology was found to be colloidal-like with nanoparticles embedded in glue-like substances.…”

Section: Laser and Photonics Reviewsmentioning

confidence: 99%

“…The possibility of material nanoprocessing based on femtosecond laser pulse ablation (i.e., material ejection from the irradiated sample [1]) was first shown in [2,3]. Subsequently, several femtosecond laser techniques have been developed for surface nanostructuring such as the mask projection technique [4], near-field ablation [5][6][7][8], laser-assisted chemical etching [9], nanotexturing by deposition from a femtosecond laser ablation plume [10][11][12][13][14], nanostructuring of thin metal films by femtosecond laser-induced melt [15][16][17], plasmonic nanoablation [18], direct femtosecond laser ablation [14,19,20], and interferometric femtosecond laser ablation [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Direct femtosecond laser surface nano/microstructuring and its applications

Vorobyev

Chen

2012

Laser & Photonics Reviews

960

584

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This paper reviews a new field of direct femtosecond laser surface nano/microstructuring and its applications. Over the past few years, direct femtosecond laser surface processing has distinguished itself from other conventional laser ablation methods and become one of the best ways to create surface structures at nano‐ and micro‐scales on metals and semiconductors due to its flexibility, simplicity, and controllability in creating various types of nano/microstructures that are suitable for a wide range of applications. Significant advancements were made recently in applying this technique to altering optical properties of metals and semiconductors. As a result, highly absorptive metals and semiconductors were created, dubbed as the “black metals” and “black silicon”. Furthermore, various colors other than black have been created through structural coloring on metals. Direct femtosecond laser processing is also capable of producing novel materials with wetting properties ranging from superhydrophilic to superhydrophobic. In the extreme case, superwicking materials were created that can make liquids run vertically uphill against the gravity over an extended surface area. Though impressive scientific achievements have been made so far, direct femtosecond laser processing is still a young research field and many exciting findings are expected to emerge on its horizon.

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“…Controlled modification of material properties in a microscopic volume can be realized by means of nonlinear absorption of ultrafast laser pulses. This approach was widely applied in technologies of laser micro-and nanoprocessing of materials [20][21][22], including laser-induced chemical modification such as laser polymerization [23][24] or multiphoton photoreduction of metal ions [25][26]. As concerns biological materials, nonlinear optical interaction with ultrafast laser pulses were studied mostly from a perspective of laser micro and nanosurgery of cells and tissues [27][28].…”

Section: Introductionmentioning

confidence: 99%

Live cell bioimaging with carbon dots produced in situ by femtosecond laser from intracellular material

Shakhov

Astafiev

Osychenko

et al. 2018

Preprint

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Owning to excellent optical properties and high bio-compatibility carbon dots (CDs) have drawn increasing attention and have been widely applied as imaging agents for various bio-applications. Here we report a strategy for live-cell fluorescent bioimaging based on in situ synthesis of CDs within cells by tightly focused femtosecond laser pulses. Laser-produced carbon dots exhibit bright excitationdependent fluorescence and are highly two-photon active under near infrared femtosecond excitation, thus demonstrating a potential for two-photon fluorescence imaging. The Raman spectra of fluorescent centers show strong D (1350 cm -1 ) and G (1590 cm -1 ) bands, thus suggesting that they are composed of carbon dots with sp 2 -hybridyzed core. Using Mouse GV oocytes as a model system we examine cytotoxicity and demonstrate the possibility of long-term fluorescent intracellular tracking of the laser-produced CDs. Created virtually in any point of the live cell, CD-based fluorescent µm-sized markers demonstrate high structural stability and retain bright fluorescence many hours after formation. Our results point to laser-produced fluorescent CDs as a highly-potent tool for cell cycle tracking, culture cell marking and probing intracellular movements.

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Towards nanostructuring with femtosecond laser pulses

Cited by 249 publications

References 0 publications

Differential fine‐tuning of cochlear implant material–cell interactions by femtosecond laser microstructuring

Differential fine‐tuning of cochlear implant material–cell interactions by femtosecond laser microstructuring

Direct femtosecond laser surface nano/microstructuring and its applications

Live cell bioimaging with carbon dots produced in situ by femtosecond laser from intracellular material

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