Nano-Kirigami Metasurface – Efficient Polarization Conversion

Due to their simple three-dimensional (3D) nanofabrication, numerous shape transformations, appealing manipulation capabilities, and wealth of possible applications in nanophotonic devices, nano-kirigami metasurfaces have gained increasing attention. In this work, researchers show the broadband and high-efficiency linear polarization conversion in the near-infrared wavelength range by introducing an out-of-plane degree of freedom to the double split-ring resonators (DSRR) using the nano-kirigami approach. In particular, in the broad spectral region from 1160 to 2030 nm, a polarization conversion ratio (PCR) of more than 90% is attained when the two-dimensional DSRR precursors are converted into 3D counterparts.

Additionally, they show that the high-performance and broadband PCR may be easily adjusted by purposefully deforming the vertical displacement or changing the structural characteristics. Finally, the proposal is effectively shown as a proof-of-concept demonstration using the nano-kirigami fabrication approach. The investigated nano-kirigami-based polymorphic DSRR imitate a succession of discrete bulk optical components with multifunction, obviating the need for their mutual alignment and creating new opportunities.

Researchers describe how they used a nano-kirigami metasurface to create a broadband, high-efficiency polarization conversion in the near-infrared spectrum. Metasurfaces with polymorphic double split ring resonators (DSRRs) and various physical properties are made possible by etching the nearby suspended nanofilms. According to calculations and experiments, the 2D DSRR metasurfaces combine two small bands of localized gap plasmons to generate a broadband and high-efficiency polarization conversion in the 3D upward deformed DSRR structures. The polarization conversion ratio (PCR) value exceeds 90% between 1160 and 2030 nm in wavelength.

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