The effects of different parameters and interaction angles of a 532 nm pulsed Nd: YAG laser on the properties of laser-ablated silver nanoparticles

AbstractElectronic and vibrational energy transfer processes taking place in molecular complexes in a polymer are investigated under dual-wavelength (visible at λ = 532 nm and IR at wavelength λ = 10.6 μm) laser photoexcitation of eosin molecules ( С = 4 × 10^–4 М) in air and without it ( р ≈ 10^–4 Torr) in thin polyvinyl butyral (PVB) films containing silver nanoparticles ( R ≈ 36 nm) prepared by laser ablation. Generation of singlet oxygen, singlet–triplet annihilation, and enhancement of plasmon quenching of dye fluorescence are studied. Thermal-energy transfer processes in thin PVB films following pulsed IR excitation are simulated, and the temperature conductivity coefficients of the polymer films in the presence of silver nanoparticles are calculated. Low-temperature processes in PVB films containing dye molecules taking place after IR excitation are investigated, and the mechanism for accelerating intercombination S _1 → Т _1 transitions as a result of thermal heating and intramolecular vibrational-energy distribution is explained.

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Z-Scan Study on a Silver Nanoparticles Embedded TeO2-SiO2 Glass Prepared by Sol-Gel Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.768.239 ◽

2018 ◽

Vol 768 ◽

pp. 239-245

Author(s):

Qiang Li ◽

Wei Ying Liu ◽

Guo Yin Sun

Keyword(s):

Silver Nanoparticles ◽

Nonlinear Optical ◽

Sol Gel ◽

Laser Pulses ◽

Aqueous System ◽

Optical Parameters ◽

Optical Performance ◽

Composite Gel ◽

Composite Glass ◽

532 Nm

An inserted type Ag/TeO2-SiO2composite gel glass was prepared through silver nanoparticles embedded in TeO2-SiO2composite gel. The silver nanoparticles were prepared previously by ascorbic acid deoxygenates AgNO3solution and mixed into TeO2-SiO2composite sol which was prepared in aqueous system using TeO2and tetraethoxysilane as precursors, and then the inserted type Ag/TeO2-SiO2composite gel glass was produced through sol aging and molding. The silver nanoparticles which dispersed in the TeO2-SiO2gel substrate made the composite glass having excellent nonlinear optical properties. The nonlinear optical parameters was tested by Z-scan technique using 15 ps laser pulses at the wavelength of 532 nm. The surface morphology was characterized by SEM. The results identified that spherical Ag nanoparticles with the size about 50-100 nm dispersed in the TeO2-SiO2gel. In the Ag/TeO2-SiO2material, the doped structure and the trigonal bipyramid structure of TeO2was the important factor for the excellent nonlinear optical performance.

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Laser-Induced Size and Shape Transformation of Silver Colloidal Nanoparticles

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.106.27 ◽

2005 ◽

Vol 106 ◽

pp. 27-30 ◽

Cited By ~ 4

Author(s):

Nikolai Tarasenko ◽

Andrei Butsen ◽

Gvidona Shevchenko ◽

Ilona Yakutik

Keyword(s):

Silver Nanoparticles ◽

Laser Radiation ◽

Pulsed Laser ◽

Colloidal Nanoparticles ◽

Shape Transformation ◽

Experimental Conditions ◽

Pulsed Laser Radiation ◽

Agno3 Solution ◽

Silver Colloidal Nanoparticles ◽

532 Nm

In this paper studies of the changes of the morphology of silver colloidal nanoparticles under laser irradiation at different fluences and wavelengths have been presented. Silver nanoparticles of size 10-30 nm were prepared in a gelatin stabilized AgNO3 solution under reduction with K-Na-tartrate. They were then exposed to pulsed laser radiation at 532 nm, 400 nm and 266 nm. In addition to the fragmented particles, relatively larger-size (1400-1500 nm) rightangled structures were found to be formed in the solution. The experimental conditions favouring laser-induced transformation of the morphology of nanoparticles have been determined.

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LASER TATTOO REMOVAL COMPARISON BETWEEN 1064 AND 532 NM OF A Q-SWITCHEd Nd:YAG LASER TREATMENT

Jurnal Teknologi ◽

10.11113/jt.v78.7499 ◽

2016 ◽

Vol 78 (3) ◽

Author(s):

Nada Abusalah Almabrouk Imrigha ◽

Lau Pik Suan ◽

Shumaila Islam ◽

Ganesan Krishnan ◽

Noriah Bidin

Keyword(s):

Skin Biopsy ◽

Laser Treatment ◽

Laser Fluence ◽

Pulse Energy ◽

Single Pulse ◽

Skin Damage ◽

Laser Method ◽

Yag Laser ◽

Tattoo Removal ◽

532 Nm

Invention of the Q-switch advanced laser method is the most effective methods of tattoo removal compared to other methods of i.e. chemical, mechanical and surgical. In this study, we are reporting black pigment tattoo removal by comparing two wavelengths 532 nm and 1064 nm of Q-switched Nd-YAG laser. Using a single-pulse laser at 1064 nm wavelength, the maximum laser fluence for skin damage is 3.04 J/cm2 with pulse energy 0.55 J. While, at 532 nm wavelength, maximum laser fluence is 0.5 J/cm2 with pulse energy 0.42 J at 8-10 ns for tattooed skins. Moreover, after 1064 nm and 532 nm laser irradiations, skin biopsy of black tattooed rat’s skin demonstrates the ink granules local redistribution. Microscopic study indicates that black ink particles become smaller and vanished from the skins after 1064 nm laser treatment. The findings of this study indicate that 1064 nm wavelengths of Q-switched Nd-YAG laser treatment with 0.55 J pulse energy, is one of the significant methods of black tattoo removal with remarkable differences.

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