Surface plasmon resonance on laser-modified titanium for optical sensors

Abstract

In the last three-four decades, functional surface structures have attracted wide attention of scientists due to their outstanding properties and extensive application possibilities in a huge range of optical, thermal, electronic, energy, mechanical and biomedical fields. One of the most popular methods of surface modification is considered to be laser structuring. Laser processing technologies have high precision, easy development, technological flexibility and compatibility with various materials, especially metals. Moreover, the morphology of the obtained surface structures can be controlled quite easily by adjusting such parameters as radiation wavelength, pulse duration and exposure time.
Surface plasmons arise at the metal-dielectric interface as a result of the interaction between incident waves and free electrons in the metal. These plasmons propagate as oscillating charge waves along the dielectric-metal interface, resulting in a distinct minimum in the reflection profile. A surface plasmon resonance arises. At present, surface plasmon resonance is the leading method in the field of detection and creation of highly sensitive biosensors.
Titanium oxide appears to be a promising material for sensing applications due to its chemical stability, wide bandwidth, high refractive index and dielectric constant. This helps to improve the field at the interface between titanium oxide and the sensing medium, which increases the sensitivity of such sensors.
This study proposes a methodology for the creation of laser-processed functional porous surfaces based on structured titanium with the effect of plasmonic absorption for use in the composition of new biosensors.

Speaker

Michael Kuritskij
Immanuel Kant Baltic Federal University
Russia

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