Thermally switchable terahertz wavefront metasurface modulators based on the insulator-to-metal transition of vanadium dioxide.

Active use of phase transition phenomena for reversibly tuning the properties of functional materials in devices currently is an attractive research area of materials science. We designed and fabricated two kinds of metasurface modulators for dynamically controlling the wavefront of terahertz (THz) radiation based on the temperature-induced insulator-to-metal phase transition of vanadium dioxide (VO). The modulators designed are based on the C-shaped slot antenna array.

Materials processing using radio-frequency ion-sources: Ion-beam sputter-deposition and surface treatment.

The capabilities of ion-beam techniques for thin-film processing, i.e., for materials deposition by ion-beam sputtering and surface treatment, are reviewed.