Fig. 5: Imaging applications of several typical mechanical tunable meta-lenses.
From: Mechanically reconfigurable metasurfaces: fabrications and applications
a A mechanically reconfigurable metalens through mechanically controlling geometries of nanostructures on the PDMS substrate68. b Highly tunable dielectric metasurface devices based on subwavelength-thick silicon nano-posts encapsulated in a thin, transparent elastic polymer69. c A moiré metalens with wide focal length tunability from negative to positive by mutual angle rotation at the wavelength of 900 nm70. d An ultrathin tunable metalens whose focal distance can be changed through optomechanical control with moderate continuous-wave intensities71. e MEMS-controllable gap between two substrates with metasurface nanostructures72.
