Prof. Ahmed M. El-Naggar Profile

Prof. Ahmed M. El-Naggar

at King Saud Univ

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Proceedings Article | 2 March 2020 Paper

Femtosecond stimulated electro-optics of electrochemically synthesized CdS particles of different morphology

Katarzyna Ozga, Oleksandr Yanchuk, Oleg Marchuk, Irina Moroz, Iwan Kityk, Ahmed El-Naggar, Ahmed Albassam

Proceedings Volume 11274, 112741W (2020) https://doi.org/10.1117/12.2543528

KEYWORDS: Particles, Cadmium sulfide, Electro optics, Nanoparticles, Femtosecond phenomena, Scanning electron microscopy, Laser development, Nanocomposites, Continuous wave operation, Crystals

Read Abstract +

A laser operated nanocomposites for linear electrooptics modulators based on cadmium sulfide (CdS) nanoparticles synthesized by electrochemical anodizing method in the polyvinyl alcohol (PVA) solvent are realized. The basic components are CdS nanoparticles. The XRD data confirm that the wurtzite component content was varied within the 10 % to 27%. Varying PVA solvent the average sizes have been changed. The synthesized powders consist of nano-sized particles with sizes varying within 11 nm…14.5 nm. It is demonstrated an influence of PVA content on the grain sizes. The diameter of particles of CdS is enhanced with an increasing PVA content. The PVA causes a significant increase in the size of the particles. The photoinduced electrooptics has been performed using as a photoinducing 120 fs femtosecond laser at 1045 nm. The linear electrooptics was probed by He-Ne cw laser at 1150 nm. A correlation between the content of wurtzite CdS component and the output electrooptics is found. The maximal values are achieved for the 83.8 % of wurtzite CdS component. For other content of wurtzite CdS these values are less. This one reflect a fact of significant role of acentric crystallites in the observed dependences that may be used for the further search and design of the laser operated electrooptical materials in a future development of laser modulators and laser triggers. Additional important role is played by interfaces. The principal physical origin of the effect is caused by interfaces between the nanoparticles and structurally disordered background. The effect is completely irreversible and disappears after several seconds.

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