Laser-processed multifunctional titanium metasurfaces for optics and biophotonics

Abstract

Currently, metasurfaces based on various materials, especially metals, are actively used in a wide variety of optical, mechanical, energy, electronic, thermal and biomedical applications. Laser-processed functional surface structures resulting from nano- and femtosecond laser exposure give such surfaces new unique properties.
In this paper, we propose a method for creating laser-induced micro- and nanoporous metasurfaces based on anodized titanium. The surfaces are structured at wavelengths of 355 nm, 532 nm and 1064 nm with varying exposure times, the speed of the laser beam and its trajectory, which makes it possible to control the morphology and, accordingly, the properties of the resulting metasurfaces. Such materials have a noticeable effect of surface plasmon resonance and are used in a wide variety of fields, from optics and photovoltaics to biomedicine.
Firstly, the studied surfaces have unique properties of reflecting and absorbing electromagnetic radiation in the visible and infrared regions, which opens the way to using the developed structures to mask objects in a wide spectral range.
Secondly, the plasmonic absorption enhancement effect enables the use of such metasurfaces in highly sensitive biosensors and photosensitizers, as well as for enhancing luminescence and Raman scattering signals from low-luminescent media.
Finally, laser-induced surface structures that enhance photocatalytic activity and effectively trap and absorb light are widely used in electroanalytical devices, as well as in technologies for creating anti-reflective nanostructures for application in photothermal and photovoltaic systems.

Speaker

Kuritskij Michael
Immanuel Kant Baltic Federal University
Russia

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