Microwave seminar | 02 October 2023

We numerically analyze a tunable millimeter-wave polarization converter based on liquid crystals (LCs) smoothy rotating the polarization plane of the transmitted wave beam with a low level of the reflection coefficient at 72 GHz. It is formed by three cascaded metasurfaces with low reflection loss, i.e. two tunable phase-shifting plates and one linear-to-circular polarization converter. Each phase-shifting plate contains two LC layers separated by a quarter-wave layer. On both sides of each LC layer, there are metallization layers, which are periodic structures with a subwavelength period deposited on quartz substrates. When illuminated with a linearly-polarized wave beam, the converter allows tunable polarization rotation at an angle of up to 90 degrees. The numerical simulations predict relatively low dissipative losses and reflection coefficient level.

Main paper/arXiv, related to the seminar:

Glybovski, S. B., Tretyakov, S. A., Belov, P. A., Kivshar, Y. S., & Simovski, C. R. (2016). Metasurfaces: From microwaves to visible. Physics reports, 634, 1-72.