Laser-induced breakdown in aqueous media

Kennedy, Paul K.; Hammer, Daniel X.; Rockwell, Benjamin A.

doi:10.1016/s0079-6727(97)00002-5

Cited by 299 publications

(230 citation statements)

References 231 publications

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“…Besides, it is worth noting that heating-melting-evaporation processes are also observed in nanosecond laser irradiation. 36 It is difficult to attribute such a thermal mechanism for the welding of Au nanoparticles since the thermal coupling time between electrons and lattice is about 1 ps, remarkably longer than the laser pulses. Besides, the nanoparticles in Fig.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond laser welded nanostructures and plasmonic devices

Peng

Alarifi

et al. 2012

Journal of Laser Applications

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Nanojoining, a burgeoning research area, becomes a key manufacturing of complicated nanodevices with functional prefabricated components. In this work, various nanojoining methods are first reviewed. For nanojoining of Ag/Au nanoparticles, three methods are investigated comparatively. Thermal annealing shows a two-step solid state diffusion mechanism. Laser annealing by millisecond pulses displays the thermal activated solid state diffusion. Meanwhile, two effects have been identified in femtosecond laser irradiation with different laser intensities: photofragmentation at rather high intensity (∼1014 W/cm2) and nanojoining at low intensity (∼1010 W/cm2). The photofragmentation forms a large number of tiny nanoparticles with an average size of 10 nm. Control over irradiation conditions at intensities near 1010 W/cm2 results in nanojoining of most of the nanoparticles. This nanojoining is obtained through a nonthermal melting and a surface fusion welding. Joined Au nanoparticles are expected to have numerous applications, such as probes for surface enhance Raman spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Femtosecond laser welded nanostructures and plasmonic devices

Peng

Alarifi

et al. 2012

Journal of Laser Applications

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“…17 Images of these events were recorded by an electron-multiplying charge-coupled device ͑EMCCD͒ camera ͓Andor Technology plc., iXonEM+ 885, 31.23 frames per second ͑fps͔͒ coupled to the microscope. The sum of the absolute values obtained from the gradient signals at each pixel between six consecutive frames over ϳ160 ms before and after the LIB ͑supplementary MATLAB ® code 20 ͒ revealed the formation of residual gas bubbles ͓Figs.…”

Section: ͒mentioning

confidence: 99%

Spatially optimized gene transfection by laser-induced breakdown of optically trapped nanoparticles

Arita

Torres-Mapa

Lee

et al. 2011

Applied Physics Letters

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We demonstrate laser-induced breakdown of an optically trapped nanoparticle with a nanosecond laser pulse. Controllable cavitation within a microscope sample was achieved, generating shear stress to monolayers of live cells. This efficiently permeabilize their plasma membranes. We show that this technique is an excellent tool for plasmid-DNA transfection of cells with both reduced energy requirements and reduced cell lysis compared to previously reported approaches. Simultaneous multisite targeted nanosurgery of cells is also demonstrated using a spatial light modulator for parallelizing the technique.

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“…[12][13][14][15][16][17][18][19][20]. Briefly, the photodisruption process can be described as follows: by tightly focusing an ultrashort laser pulse into an aqueous medium like biological tissue, nonlinear absorption processes, such as multiphoton, tunnel, and cascade ionization, are initiated within the focal volume due to the very high intensities.…”

Section: Introductionmentioning

confidence: 99%

Effects of cavitation bubble interaction with temporally separated fs-laser pulses

et al. 2014

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Abstract. We present a time-resolved photographic analysis of the pulse-to-pulse interaction. In particular, we studied the influence of the cavitation bubble induced by a fs-pulse on the optical focusing of the consecutive pulse and its cavitation bubble dynamics in dependence on temporal pulse separation in water. As a first result, by decreasing the temporal separation of laser pulses, there is a diminishment of the laser-induced optical breakdown (LIOB) efficiency in terms of energy conversion, caused by disturbed focusing into persisting gas bubbles at the focal volume. A LIOB at the focal spot is finally suppressed by impinging the expanding or collapsing cavitation bubble of the preceding pulse. These results could be additionally confirmed in porcine gelatin solution with various concentrations. Hence, the interaction between the laser and transparent ophthalmic tissue may be accompanied by a raised central laser energy transmission, which could be observed in case of a temporal pulse overlap. In conclusion, our experimental results are of particular importance for the optimization of the prospective ophthalmic surgical process with future generation fs-lasers.

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Laser-induced breakdown in aqueous media

Cited by 299 publications

References 231 publications

Femtosecond laser welded nanostructures and plasmonic devices

Femtosecond laser welded nanostructures and plasmonic devices

Spatially optimized gene transfection by laser-induced breakdown of optically trapped nanoparticles

Effects of cavitation bubble interaction with temporally separated fs-laser pulses

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