Electrical Conductivity and Optical Properties of Nanoscale Titanium Films on Sapphire for Localized Plasmon Resonance-Based Sensors

The developing area of plasmonics has led to the possibility of creating a new type of high-speed, high-sensitivity optical sensor for biological environment analysis. The functional layer of such biosensors are nanoscale films of noble metals. In this work we suggest using a thin film of titanium a...

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Bibliographic Details
Published in:Coatings (Basel) 2020-12, Vol.10 (12), p.1165
Main Authors: Korotkova, Klavdiya, Bainov, Dashi, Smirnov, Serafim, Yunusov, Igor, Zhidik, Yury
Format: Article
Language:English
Subjects:
Biosensors
Electrical resistivity
Magnetron sputtering
Nanoparticles
Noble metals
Optical measuring instruments
Optical properties
Photonics
Sapphire
Sensors
Substrates
Surface plasmon resonance
Thick films
Thin films
Titanium
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Summary:The developing area of plasmonics has led to the possibility of creating a new type of high-speed, high-sensitivity optical sensor for biological environment analysis. The functional layer of such biosensors are nanoscale films of noble metals. In this work we suggest using a thin film of titanium as a functional layer. This paper presents the results of the research on electrical and optical characteristics of 5 to 80 nm thick titanium films deposited on sapphire substrates by magnetron sputtering. It is shown that surface plasmon resonance is consistently observed in the investigated titanium films and the theoretical grounds of surface plasmon resonance excitement is given. In structures with titanium films less than 15 nm thick, local plasmon resonance is observed along with surface plasmon resonance. Local plasmon resonance is more sensitive to the surface state of a thin film of titanium, which on the one hand increases the sensitivity of a biosensor, and on the other hand imposes restrictions on the parameters of nanoscale films.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings10121165