Ionization and photomodification of Ag nanoparticles in soda-lime glass by 150 fs laser irradiation: a luminescence study

Podlipensky, A.; Гребенев, В. В.; Seifert, G.; Graener, H.

doi:10.1016/s0022-2313(04)00115-2

Cited by 41 publications

(39 citation statements)

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“…Afterwards in time, the aggregated small silver clusters ͑i.e., Ag 2 -Ag 8 ͒ join to the main NP. 22 This is a kind of Ostwald ripening process, 30 where large particles gain volume at the expense of the volume of small ones. Gradually ͑with the additional cycle of effects from the coming pulses͒ a growing NP aspect ratio is maintained along the pulse polarization direction.…”

Section: Discussionmentioning

confidence: 99%

“…21 The emitted electrons relax rapidly and they are trapped in the glass. 22 The remaining electrons equilibrate to a hot electronic distribution and heat up the NP lattice gradually. The electrodynamical and thermodynamical situation of the NP electrons and lattice can be investigated using the two-temperature model ͑2TM͒ in conjunction with the electronic band structure of the composite glass.…”

Section: Introductionmentioning

confidence: 99%

“…The ionized, hot NP will no longer be stable, and due to the repulsive Coulomb forces, it ejects silver ions into the surrounding glass matrix. 22,23 These fast mechanisms were observed within the first 20 ps after the laser-pulse absorption, and a detailed analysis of these processes was investigated using femtosecond pulse-pair irradiation experiments. 21 In this work, we present the dynamics happening on and around the NP in a longer time delay-until 1 ns-together with temperature modeling of the "NP-glass" system, which is named as three-temperature model ͑3TM͒ for convenience.…”

Section: Introductionmentioning

confidence: 99%

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Time-resolved investigation of laser-induced shape transformation of silver nanoparticles

et al. 2009

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Laser-induced permanent shape transformation dynamics of glass-embedded silver nanoparticles is investigated by a pulse-pair irradiation technique, where the nanoparticles are irradiated by pairs of time-delayed femtosecond laser pulses. The temporal evolution of surface plasmon extinction bands is obtained up to a time delay of 1 ns. We find that the aspect ratio of the modified nanoparticles, i.e., the observed dichroism, reduces rapidly to a minimum level within 20 ps after the laser irradiation. From that interpulse delay onward, the resulting aspect ratio stays at that minimum level until 100 ps. Subsequently, for longer time delays, the aspect ratio increases again until 1 ns. Temperature modeling of the nanoparticle-glass system gives evidence that the intermediately reduced dichroism is due to the high diffusion mobility that emitted silver ions can possess within a shell of heated glass around the nanoparticle, in a time window of 100 ps. For longer time delays the size of the heated glass shell gets reduced, thereby limiting the range of ionic diffusion. The theoretical estimations confirm the experimental results and suggest that the nanoparticle shape changes depend strongly on the thermal situation induced to the surrounding glass.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Time-resolved investigation of laser-induced shape transformation of silver nanoparticles

et al. 2009

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“…From luminescence and extinction spectra, 22 we know that Ag ions are being emitted into the glass matrix upon fs laser irradiation. Transmission electron microscopy ͑TEM͒ pictures 6,10,11 showed that this ion emission leads to partial dissolution of the NPs, creating small Ag aggregates around the remaining NP.…”

Section: Laser Pulse Interaction With Nanoparticlesmentioning

confidence: 99%

“…So it is obvious that after a few picoseconds already some electrons have left the NP, i.e., the nanoparticle is then positively charged and very hot; electric potential and thermal energy can overcome the binding energy of Ag ions, which are being emitted into the surrounding glass matrix. 12,13,16,22 As a result of this relaxation mechanism, the total volume of the NP is reduced over time. In addition, part of the energy will be taken from the NP and, via kinetic energy of the ions, be transferred to the glass when the ions are trapped there, which is an additional cooling mechanism of the NP.…”

Section: Laser Pulse Interaction With Nanoparticlesmentioning

confidence: 99%

Ultrafast dynamics of silver nanoparticle shape transformation studied by femtosecond pulse-pair irradiation

et al. 2009

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Spherical silver nanoparticles embedded in glass were irradiated by pairs of time-delayed laser pulses with equal intensities resulting in delay-dependent nanoparticle shape transformations. The corresponding persistent changes in the surface-plasmon extinction bands are analyzed as a function of time delay and relative polarization of the pulse pairs. We find that the strongest nanoparticle shape changes, i.e., the highest aspect ratios, are achieved when the delay between pulse pairs is less than 3 ps. After 10 ps the dichroism is strongly reduced in the case of pulse pairs having identical polarization and vanishes using pulse pairs with orthogonal polarization. Using an extended two-temperature model, the time dependence of directed and isotropic thermal electron emissions was estimated to decay on a time scale of a few picoseconds. Our results strongly suggest that the electron and following ion emission from the nanoparticles are finished within less than 20 ps, and the directional memory is favorably defined by directed emission of hot electrons interacting with the laser field.

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Optical Binding‐Driven Micropatterning and Photosculpting with Silver Nanorods

et al. 2023

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Controlling the nano‐ and micropatterning of metal structures is an important requirement for various technological applications in photonics and biosensing. This work presents a method for controllably creating silver micropatterns by laser‐induced photosculpting. Photosculpting is driven by plasmonic interactions between pulsed laser radiation and silver nanorods (AgNRs) in aqueous suspension; this process leads to optical binding forces transporting the AgNRs in the surroundings, while electronic thermalization results in photooxidation, melting, and ripening of the AgNRs into well‐defined 3D structures. This work call these structures Airy castles due to their structural similarity with a diffraction‐limited Airy disk. The photosculpted Airy castles contain emissive Ag nanoclusters, allowing for the visualization and examination of the aggregation process using luminescence microscopy. This work comprehensively examines the factors that define the photosculpting process, namely, the concentration and shape of the AgNRs, as well as the energy, power, and repetition rate of the laser. Finally, this work investigates the potential applications by measuring the metal‐enhanced luminescence of a europium‐based luminophore using Airy castles.

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Ionization and photomodification of Ag nanoparticles in soda-lime glass by 150 fs laser irradiation: a luminescence study

Cited by 41 publications

References 0 publications

Time-resolved investigation of laser-induced shape transformation of silver nanoparticles

Time-resolved investigation of laser-induced shape transformation of silver nanoparticles

Ultrafast dynamics of silver nanoparticle shape transformation studied by femtosecond pulse-pair irradiation

Optical Binding‐Driven Micropatterning and Photosculpting with Silver Nanorods

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