Investigation of resonant properties of metamaterial THz filters fabricated from vanadium dioxide thin films

Date

2024-04-01

Author

Zeyrek, Sehriban
Demirhan, Yasemin
Noori, Aileen
Tugay, Halime
Altan, Hakan
Sabah, Cumali
Aygün Özyüzer, Gülnur
Özyüzer, Lütfi

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Vanadium dioxide (VO2 ) is a promising candidate for electronic and optical switching appli- cations in the terahertz frequency range due to the metal to insulator transition (MIT). In this study, the use of VO2 patterned as a metamaterial surface or coupled as a homogeneous layer with a metallic metamaterial surface on top is investigated in terms of performance. High- quality VO2 thin ¯lms were deposited on c-cut sapphire substrates by using the dc magnetron sputtering technique. A change in resistivity by a factor of 10 4 MIT in VO2 was observed allowing to investigate its use as a controllable metamaterial. The layer was patterned using a unique geometry (four-cross shaped) that operates in the THz frequency range. To understand its performance as a tunable THz ¯lter, the four-cross structure fabricated from VO2 is compared to one fabricated from Au on VO2 bare ¯lm using UV lithography and ion beam etching techniques. The spectral performances of metamaterials were assessed using THz-Time Domain Spectroscopy (THz-TDS) and results were compared with simulations based on CST Microwave Studio. Absence of the resonant e®ects in the purely developed VO2 device, while clear observation of the MIT behavior shows the strong dependency of the inductive and/or capacitive e®ects of the four-cross structure on conductivity of the surface metamaterial, which is clearly observable for the Au-based device. In the latter case, the resonant transmittance of the ¯lter can be e®ectively modulated by change in temperature.

Subject Keywords

metal-insulating transition (MIT) materials, THz metamaterials, tunable metamaterials, VO2 thin film

URI

https://hdl.handle.net/11511/112904

Collections

Department of Physics, Article