Ultrashort laser pulse induced deformation of silver nanoparticles in glass

Kaempfe, M.; Rainer, Thomas; Berg, K.‐J.; Seifert, G.; Graener, H.

doi:10.1063/1.123498

Cited by 101 publications

(66 citation statements)

References 11 publications

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“…However, if the pump power is increased significantly, the temperature of the metal nanoparticle lattice can be raised to values well above its melting temperature within a few picoseconds (when using ultrashort laser pulses) while the temperature of the environment initially remains constant. This can then lead to size [14][15][16][17] and shape [18][19][20] changes of the nanoparticles before the deposited laser energy can be released to the surrounding medium by phonon-phonon interactions which are usually on the order of 100 ps. 4,7 It was recently reported 29 that gold nanorods prepared by an electrochemical method 30 and encapsulated in micelles in aqueous solution undergo a rod-to-sphere shape transformation within about 30 ps due to melting of the nanorods.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Time-resolved transient absorption spectroscopy allows one to follow the electronphonon relaxation dynamics in thin metal films [21][22][23][24] and small metal particles. [1][2][3][4][5][6][7][8][9][10][11][12][13] In particular, silver 1,2,9 and gold [2][3][4][5][6][7][8][10][11][12][13] nanoparticles have been studied intensively as they show a strong absorption band in the visible region, which is due to the excitation of the surface plasmon resonance.…”

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses

2000

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Gold nanorods have been found to change their shape after excitation with intense pulsed laser irradiation. The final irradiation products strongly depend on the energy of the laser pulse as well as on its width. We performed a series of measurements in which the excitation power was varied over the range of the output power of an amplified femtosecond laser system producing pulses of 100 fs duration and a nanosecond optical parametric oscillator (OPO) laser system having a pulse width of 7 ns. The shape transformations of the gold nanorods are followed by two techniques: (1) visible absorption spectroscopy by monitoring the changes in the plasmon absorption bands characteristic for gold nanoparticles; (2) transmission electron microscopy (TEM) in order to analyze the final shape and size distribution. While at high laser fluences (∼1 J cm -2 ) the gold nanoparticles fragment, a melting of the nanorods into spherical nanoparticles (nanodots) is observed when the laser energy is lowered. Upon decreasing the energy of the excitation pulse, only partial melting of the nanorods takes place. Shorter but wider nanorods are observed in the final distribution as well as a higher abundance of particles having odd shapes (bent, twisted, φ-shaped, etc.). The threshold for complete melting of the nanorods with femtosecond laser pulses is about 0.01 J cm -2 . Comparing the results obtained using the two different types of excitation sources (femtosecond vs nanosecond laser), it is found that the energy threshold for a complete melting of the nanorods into nanodots is about 2 orders of magnitude higher when using nanosecond laser pulses than with femtosecond laser pulses. This is explained in terms of the successful competitive cooling process of the nanorods when the nanosecond laser pulses are used. For nanosecond pulse excitation, the absorption of the nanorods decreases during the laser pulse because of the bleaching of the longitudinal plasmon band. In addition, the cooling of the lattice occurring on the 100 ps time scale can effectively compete with the rate of absorption in the case of the nanosecond pulse excitation but not for the femtosecond pulse excitation. When the excitation source is a femtosecond laser pulse, the involved processes (absorption of the photons by the electrons (100 fs), heat transfer between the hot electrons and the lattice (<10 ps), melting (30 ps), and heat loss to the surrounding solvent (>100 ps) are clearly separated in time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses

2000

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“…In those interference enhanced regions, the Au film melts because the temperature increases rapidly during each short laser pulse, and so-called laser-induced dewetting takes place [21]. After the end of each laser pulse, the Au film rapidly cools down to room temperature and the Au film solidifies [21,34]. By repeating the processes of It has been reported that the direction of laser-induced periodic surface nanostructure formation is either parallel [24][25] or perpendicular [27][28] to the incident E vector.…”

Section: Methodsmentioning

confidence: 99%

Effects of nanosecond-pulsed laser irradiation on nanostructure formation on the surface of thin Au films on SiO2 glass substrates

Shibayama

Meng

et al. 2014

Applied Surface Science

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“…In this technique the metal ions are embedded in glass matrix by ion exchange with further annealing in a reducing atmosphere, resulting in randomly distributed metal aggregates with an exponentially decreasing filling factor across the depth [1]. The optical properties of nanoparticles can then be controlled by ultrashort laser pulses with a wavelength close to localized surface plasmon resonance [2]. However, a non-uniform distribution of nanoparticles in the glass matrix complicates any laser assisted modification.…”

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confidence: 99%

“…As a result, the top layer is ionized much faster Ultrashort laser pulse assisted modification of metal-embedded glasses can cause both linear and nonlinear effects due to extremely high peak intensities and the local enhancement of electric field, especially when the irradiated frequency coincides with oscillations of electrons localized on metal surface. As a result Ag clusters in a strong electric field are ionized leading to the shape deformation and dissolution [2,3]. The deformed Ag nanoparticles exhibit the differential absorption for s-and p-polarizations (Fig.…”

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confidence: 99%

Laser assisted modification of poled silver-doped nanocomposite soda-lime glass

Drevinskas

Beresna

Deparis

et al. 2013

MATEC Web of Conferences

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Thermal poling assisted homogenization of polydisperse Ag nanoparticles embedded in the soda-lime glass is demonstrated. The homogenization leads to the narrowing of the localized surface plasmon resonance. The subsequent irradiation with linearly polarized ultrashort laser pulses induces spectrally defined and four times larger dichroism than in non-poled sample.Metal-doped nanocomposite glasses are of interest for their unique linear and nonlinear optical properties. Simple and low cost fabrication technique of nanocomposite glass is based on ion exchange. In this technique the metal ions are embedded in glass matrix by ion exchange with further annealing in a reducing atmosphere, resulting in randomly distributed metal aggregates with an exponentially decreasing filling factor across the depth [1]. The optical properties of nanoparticles can then be controlled by ultrashort laser pulses with a wavelength close to localized surface plasmon resonance [2]. However, a non-uniform distribution of nanoparticles in the glass matrix complicates any laser assisted modification. In this work we demonstrate the poling assisted homogenization of Ag nanoparticles embedded in soda-lime glass matrix, which improves laser assisted modification of optical properties.The polydisperse nanocomposite sample prepared from soda-lime float glass by Ag + -Na + ion exchange method was provided by CODIXX AG. The spherical Ag nanoparticles of 30-40 nm mean diameter were distributed in a thin surface layer of several micrometers thickness with the high filling factor close to the surface. The sample was thermally poled in air inside the oven using pressed-contact electrodes, with the anode facing the Ag-doped area. The laser modification of Ag nanoparticles was performed using a regeneratively amplified, mode-locked Yb:KGW based ultrafast laser system (Pharos, Light Conversion Ltd.). The laser system was operating at 515 nm (frequency doubled) and 200 kHz repetition rate. The laser beam was focused on the top of sample via a ×5 (NA=0.13) objective lens. The modification of poled area was carried out using 1 ps pulse duration, linear polarization, 0.5 mm/s writing speed with 5 µm interline distance, 10000 pulses/mm density and the varying laser pulse intensity from 2.2×10 10 W/cm 2 to 4.4×10 11 W/cm 2 , i.e. below the damage threshold of soda-lime glass. For the modification of pristine area we used 700 fs pulses, linear polarization, 5 mm/s speed with 5 µm interline distance, 40000 pulses/mm density and the intensities from 5.0×10 10 W/cm 2 to 2.3×10 11 W/cm 2 . For the optical characterization, the absorption spectra of pristine and poled areas were taken with UV-VIS-NIR spectrophotometer (Varian, CARY 500) and optical characterization of modified micro-areas was made with UV-VIS-NIR imaging spectrometer (Andor, Shamrock SR-303i) and VIS microspectrometer system (Olympus BX51, CRAIC). The spectral dependence of modified Ag-doped glass for s-and p-polarizations was measured by inserting linear polarizer before the sample. Image...

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Ultrashort laser pulse induced deformation of silver nanoparticles in glass

Cited by 101 publications

References 11 publications

Laser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses

Laser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses

Effects of nanosecond-pulsed laser irradiation on nanostructure formation on the surface of thin Au films on SiO2 glass substrates

Laser assisted modification of poled silver-doped nanocomposite soda-lime glass

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