Research / 2019 / Article / Fig 2

Review Article

Tunable/Reconfigurable Metasurfaces: Physics and Applications

Figure 2

Mechanically switchable metasurfaces. (a) Schematics of a THz thermomechanical tunable metasurface with meta-atom design and measured transmission spectra at different temperatures. (b) A micromachined MSM composed by reconfigurable asymmetric SRRs for controlling THz waves. (c) MEMS-controlled phase transitions between underdamped and overdamped resonators in a THz MSM. Insets: schematics and photos of the realized MSM. (d) A MSM realized with NEMS technology for actively controlling the transmission/reflection properties of near-IR light. Inset: image of the fabricated metadevice with detailed meta-atom structure. (e) Dynamic resonant-frequency tuning achieved with a MSM based on a flexible substrate in IR regime. (f) Active polarization conversion of microwaves achieved by a liquid-metal-incorporated metasurface realized with microfluidics technology. Insets: schematics of the designed tunable meta-atom (bottom panel) and a zoomed-in view of the microfluidic metasurface with galinstan filled-in (up-panel). Reproduced with permissions: (a) from [30] ©2009 APS; (b) from [31] ©2011 Wiley-VCH; (c) from [32] ©2017 Wiley-VCH; (d) from [33] ©2013 NPG; (e) from [34] ©2010 ACS; (f) from [35] ©2017 Wiley-VCH.