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8LD-O-2
Picosecond recording and optical features of nanostructures in AlZnO:Ag films
Sergeev M.M., Dolgopolov A.D., Gresko V.R.
ITMO University, Faculty of Nanoelectronics, Saint Petersburg, Russia
gresko. 9 7@mail.ru
Thin sol-gel films are widely applied in the nanoelectronics, photonic crystals, and biomedical applications. This is especially true for transparent semiconductor films modified by laser emission. Therefore, the study of alterations in the optical properties of such films after laser emission becomes more and more important for the applications of such materials in the field of spectrophotometry, and especially for SERS.
In this work, nanogratings with a submicron period and a relievo depth of several tens of nm on the surface of AlZnO sol-gel films with silver nanoparticles were obtained by the method of two-beam interference processing by pulsed laser emission.
Such nanostructures can be used to enhance the luminescence signal from certain materials [1]. This study shows the effect of the resulting gratings on the luminescent properties of the dye rhodamine G6. The wavelength of the peak of the luminescence intensity of rhodamine was comparable to the period of the nanograting. The nanostructure amplified the signal of rhodamine intensity several times, while the maximum amplification occurred at a wavelength near the grating period. At the same time, both the luminescence spectra of a solution of rhodamine and rhodamine on the initial untreated AlZnO film differed from each other only slightly and had a maximum at a longer wavelength.
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Длина волны, нм
Fig. 1 (a) SEM image of nanogratings (b) Dependence of the fluorescence intencivity on the wavelength at normal incidence relative to the untreated surface of the AlZnO film (c) Appearance of a nanograting at high magnification in a bright field
Acknowledgments
The study is funded by the grant of Russian Science Foundation (project № 19-79-10208).
[1] Wang J. et al. Ultrasensitive SERS detection of rhodamine 6G and p-nitrophenol based on electrochemically roughened nano-Au film //Talanta. - 2020. - T. 210. - C. 120631..
