Silver Nanoparticles under Nanosecond Pulsed Laser Excitation as an Intensity Sensitive Saturable Absorption to Reverse Saturable Absorption Switching Material

Optical nonlinearity involved switching draws an important consideration in nonlinear optical studies. Based on that, we explored nonlinear absorption processes in silver nanoparticles synthesized by liquid phase laser ablation technique employing a second harmonic wavelength (532 nm) of Q switched...

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Bibliographic Details
Published in:Photonics 2021-10, Vol.8 (10), p.413
Main Authors: Shiju, Edappadikkunnummal, Sharafudeen, Kaniyarakkal, Remya, T. M., Siji Narendran, N. K., Sudheesh, Palengara, Sadasivan Nair, Vijayakumar
Format: Article
Language:English
Subjects:
Ablation
Absorption
Aperture
Defocusing
Experiments
Laser ablation
Lasers
Liquid phases
Morphology
Nanoparticles
Nanosecond pulses
Nanostructured materials
Neodymium lasers
nonlinear absorption
nonlinear refraction
Nonlinear systems
Nonlinearity
optical limiting
Pulse duration
pulsed laser ablation
Pulsed lasers
Semiconductor lasers
Silver
Surface plasmon resonance
Switching
YAG lasers
Z-scan
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Summary:Optical nonlinearity involved switching draws an important consideration in nonlinear optical studies. Based on that, we explored nonlinear absorption processes in silver nanoparticles synthesized by liquid phase laser ablation technique employing a second harmonic wavelength (532 nm) of Q switched Nd:YAG laser pulses with 7 ns pulse width and 10 Hz repetition rates. The typical surface plasmon resonance induced absorption (~418 nm) confirmed the formation of Ag NPs. The Z-scan technique was used to study the nonlinear optical processes, employing the same laser system used for ablation. Our study reveals that there is an occurrence of a saturable to reverse saturable absorption switching activity in the Ag nanoparticles, which is strongly on-axis input intensity dependent as well. The closed aperture Z-scan analysis revealed the self-defocusing nature of the sample.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics8100413