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Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation

In this study, we experimentally investigated the nonlinear optical properties of Au nanoparticles (Au NPs) that were prepared in pure distilled water using the laser ablation method. The Au NPs were prepared using a nanosecond Nd:YAG laser with an ablation time of 5 or 10 min at a constant laser en...

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Main Authors: Ashour, Mohamed, Faris, Hameed G., Ahmed, Hanan, Mamdouh, Samar, Thambiratnam, Kavintheran, Mohamed, Tarek
Format: Article
Published: MDPI 2022
Subjects:
QC Physics
QD Chemistry
Online Access:http://eprints.um.edu.my/41312/
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spelling my.um.eprints.413122023-09-18T07:48:34Z http://eprints.um.edu.my/41312/ Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation Ashour, Mohamed Faris, Hameed G. Ahmed, Hanan Mamdouh, Samar Thambiratnam, Kavintheran Mohamed, Tarek QC Physics QD Chemistry In this study, we experimentally investigated the nonlinear optical properties of Au nanoparticles (Au NPs) that were prepared in pure distilled water using the laser ablation method. The Au NPs were prepared using a nanosecond Nd:YAG laser with an ablation time of 5 or 10 min at a constant laser energy of 100 mJ. The structure and the linear optical properties of the Au NPs were investigated using a transmission electron microscope (TEM) and UV-visible spectrophotometer analysis, respectively. The TEM measurements showed that the average size of the Au NPs varied from 20.3 to 14.1 nm, depending on the laser ablation time. The z-scan technique was used to investigate the nonlinear refractive index (n(2)) and nonlinear absorption coefficient (gamma) of the Au NPs, which were irradiated at different excitation wavelengths that ranged from 740 to 820 nm and at different average powers that ranged from 0.8 to 1.6 W. The Au NP samples exhibited a reverse saturable absorption (RSA) behavior that increased when the excitation wavelength and/or incident laser power increased. In addition, the Au NPs acted as a self-defocusing material whenever the excitation wavelength or incident power were modified. MDPI 2022-09 Article PeerReviewed Ashour, Mohamed and Faris, Hameed G. and Ahmed, Hanan and Mamdouh, Samar and Thambiratnam, Kavintheran and Mohamed, Tarek (2022) Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation. Nanomaterials, 12 (17). ISSN 2079-4991, DOI https://doi.org/10.3390/nano12172980 <https://doi.org/10.3390/nano12172980>. 10.3390/nano12172980
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
QD Chemistry
spellingShingle QC Physics
QD Chemistry
Ashour, Mohamed
Faris, Hameed G.
Ahmed, Hanan
Mamdouh, Samar
Thambiratnam, Kavintheran
Mohamed, Tarek
Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
description In this study, we experimentally investigated the nonlinear optical properties of Au nanoparticles (Au NPs) that were prepared in pure distilled water using the laser ablation method. The Au NPs were prepared using a nanosecond Nd:YAG laser with an ablation time of 5 or 10 min at a constant laser energy of 100 mJ. The structure and the linear optical properties of the Au NPs were investigated using a transmission electron microscope (TEM) and UV-visible spectrophotometer analysis, respectively. The TEM measurements showed that the average size of the Au NPs varied from 20.3 to 14.1 nm, depending on the laser ablation time. The z-scan technique was used to investigate the nonlinear refractive index (n(2)) and nonlinear absorption coefficient (gamma) of the Au NPs, which were irradiated at different excitation wavelengths that ranged from 740 to 820 nm and at different average powers that ranged from 0.8 to 1.6 W. The Au NP samples exhibited a reverse saturable absorption (RSA) behavior that increased when the excitation wavelength and/or incident laser power increased. In addition, the Au NPs acted as a self-defocusing material whenever the excitation wavelength or incident power were modified.
format Article
author Ashour, Mohamed
Faris, Hameed G.
Ahmed, Hanan
Mamdouh, Samar
Thambiratnam, Kavintheran
Mohamed, Tarek
author_facet Ashour, Mohamed
Faris, Hameed G.
Ahmed, Hanan
Mamdouh, Samar
Thambiratnam, Kavintheran
Mohamed, Tarek
author_sort Ashour, Mohamed
title Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
title_short Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
title_full Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
title_fullStr Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
title_full_unstemmed Using femtosecond laser pulses to explore the nonlinear optical properties of Au NP colloids that were synthesized by laser ablation
title_sort using femtosecond laser pulses to explore the nonlinear optical properties of au np colloids that were synthesized by laser ablation
publisher MDPI
publishDate 2022
url http://eprints.um.edu.my/41312/
_version_ 1778161654637264896
score 13.211869

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