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ALT'23 The 30th International Conference on Advanced Laser Technologies
LM-P-4
Femtosecond laser modification of ZnO:Ag thin films
V. Gresko1, V. Smirnova1, M. Sergeev1, A. Dolgopolov1
1-ITMO University, St. Petersburg, Russia
vrgresko@itmo. ru
ZnO thin films due to their physical properties are often used as photosensitive elements and layers of various optoelectronic devices, including photodetectors [1]. The addition of silver nanoparticles to the composition of films can significantly increase the sensitivity of sensors in a certain spectral wavelength range due to the phenomenon of localized plasmon resonance, as well as increase the conductivity of the material [2]. Laser radiation is a very convenient tool for a fast, highly efficient and at the same time easily implemented method of local modification of film properties with the possibility of their correction in real time. By selecting the radiation parameters, it is possible to influence the ZnO matrix itself or the metal nanoparticles contained in it. Thanks to this, it is possible to observe various mechanisms of laser action, as well as the properties of the modified material.
In this work, we studied the effect of femtosecond laser radiation on the optical and electrical properties of composite ZnO films with silver nanoparticles. The radiation wavelength (515 nm) was close to the plasmon resonance of nanoparticles. The surface of the samples was processed at different values of the pulse duration, radiation power, pulse repetition rate, and radiation polarization. The optical and electrical characteristics of the films have been studied. A change in the position of the plasmon resonance peak was observed, as well as a change in the electrical conductivity of the material.
This work was supported by the Russian Science Foundation (project no. 19-79-10208).
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