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9LD-P-1
LASER DIAGNOSTICS AND SPECTROSCOPY
Dye's fluorescence amplification by nanostructures on various
semiconductor thin films
ALT'22
Arthur D. Dolgopolov, Vladislav R.Gresko, Maksim M. Sergeev
ITMO University, Faculty of Nanoelectronics, Saint Petersburg, Russia addolgopolov@itmo.ru
Fluorescence is used in the life sciences generally as a non-destructive way of tracking or analysing biological molecules by means of fluorescence. However, with constant dwarfing of measurements scale, it is also important to keep our analizing method updated, via inventing new technics, or reviewing existing ones with a different approach [1].
In this work, we observe properties of nanostructures with a submicron period and a several tens of nm relievo depth on the surface of semiconductor films that are obtained by the method of two-beam interference processing by pulsed laser emission. Such nanostructures were used to enhance the luminescence signal from organic compounds. In this work, it was suggested that the period of nanostructures can affect the luminescence intensity in the case when the spectral range of the luminescent emission is commensurate with the period. This study shows the effect of the resulting gratings on the luminescent properties of the dye rhodamine G6 and bromocresol purple. 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 film differed from each other only slightly and had a maximum at a longer wavelength.
The material functionality of such applications is due to the combination of the effects of a semiconductor film with plasmonic NPs and a periodic nanorelief [2]. Thus, it is possible to improve the optical properties in a certain spectral range due to the complex action of several optical effects, which can be used in microanalysis and photocatalytic applications.
Fig.1 - (a) image of nanogratings before introduction to dye (b) fluorescence spectra relative to untreated film
The study is funded by the grant of Russian Science Foundation (project No. 19-79-10208).
[1] Hang Y., Boryczka J., Wu N. Visible-light and near-infrared fluorescence and surface-enhanced Raman scattering point-of-care sensing and bio-imaging: a review //Chemical Society Reviews. - 2022.
[2] Pietsch U., Holy V., Baumbach T. High-resolution X-ray scattering: from thin films to lateral nanostructures. - Springer Science & Business Media, 2004.
