Broadband and high-efficiency polarization conversion with a nano-kirigami based metasurface

Abstract

Nano-kirigami metasurfaces have attracted increasing attention due to their ease of three-dimension (3D) nanofabrication, versatile shape transformations, appealing manipulation capabilities and rich potential applications in nanophotonic devices. Through adding an out-of-plane degree of freedom to the double split-ring resonators (DSRR) by using nano-kirigami method, in this work we demonstrate the broadband and high-efficiency linear polarization conversion in the near-infrared wavelength band. Specifically, when the two-dimensional DSRR precursors are transformed into 3D counterparts, a polarization conversion ratio (PCR) of more than 90% is realized in wide spectral range from 1160 to 2030 nm. Furthermore, we demonstrate that the high-performance and broadband PCR can be readily tailored by deliberately deforming the vertical displacement or adjusting the structural parameters. Finally, as a proof-of-concept demonstration, the proposal is successfully verified by adopting the nano-kirigami fabrication method. The studied nano-kirigami based polymorphic DSRR mimic a sequence of discrete bulk optical components with multifunction, thereby eliminating the need for their mutual alignment and opening new possibilities.

Reprogrammable metasurface design for NIR beam steering and active filtering

“…Many potential applications of metasurfaces, such as beam steering, lensing, holography or structured light generation would require full 2π phase control [15][16][17][18][19][20][21][22][23][24][25][26]. However, in the concept of digital metasurfaces, it has been shown that by employing binary or 1-bit ('0' and '1') elements with only π phase shift it is possible to achieve beam steering (see e.g.…”

“…This field investigates the potential applications of metasurfaces in developing compact optical components [18][19][20]. To date, phased array metasurfaces have been used to realize different categories of flat devices, namely beam splitters [17][18][19][20], focusing mirrors [21,22], focusing lenses [23], holograms [24], and polarization converters [25,26]. However, the aforementioned metasurfaces are passive, i.e.…”