Electric-field tuning of a planar terahertz metamaterial based on strained SrTiO.sub.3./sub. layers

0489482 - FZÚ 2019 RIV GB eng J - Článek v odborném periodiku
Kadlec, Christelle - Skoromets, Volodymyr - Kadlec, Filip - Němec, Hynek - Chen, H.T. - Jurka, Vlastimil - Hruška, Karel - Kužel, Petr
Electric-field tuning of a planar terahertz metamaterial based on strained SrTiO₃ layers.
Journal of Physics D-Applied Physics. Roč. 51, č. 5 (2018), s. 1-5, č. článku 054001. ISSN 0022-3727. E-ISSN 1361-6463
Grant CEP: GA ČR(CZ) GA14-25639S
Institucionální podpora: RVO:68378271
Klíčová slova: tunable metamaterial * metasurfaces * strontium titanate * epitaxial thin films * terahertz waves
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.829, rok: 2018

We demonstrate a metamaterial exhibiting a frequency-tunable response in the terahertz domain, controlled by a bias electric field. The active part of the metamaterial consists of a periodic metallic pattern deposited on a thin epitaxially strained strontium titanate film. The role of the metallic structure is two-fold: it gives rise to the metamaterial resonance and it enables applying an electric bias to the strontium titanate layer. The strained film exhibits a pronounced dependence of its permittivity on the bias, which exerts a strong influence on the resonance. Specifically, the resonance of our structure occurs near 0.5 THz and, upon applying a bias voltage of 55 V, a relative tunability of the resonance frequency of 19% was achieved at room temperature.
Trvalý link: http://hdl.handle.net/11104/0283892