3D cross-bended metasurfaces with polarization insensitivity and high-Q resonances. (8th September 2020)

• Record Type: Journal Article
• Authors: Pan, Ruhao; Du, Shuo; Liu, Zhe; Zhu, Wei; Li, Ce; Gu, Changzhi; Li, Junjie
• Is Part Of: Journal of optics. Volume 22:Number 10(2020)
• Publication Date: 2020-09-08
• Subjects: FIB defined Origami -- high quality factor -- Fano resonance -- 3D bended metasurface; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/abad51
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: Metasurfaces with high-quality (HQ) resonances are always desired for their potential applications in biomedicine and photonic devices. However, the realization of HQ near-infrared metasurfaces with polarization insensitivity has faced problems with metallic loss, large feature size and limited configurations. In order to build up HQ metasurfaces working at the near-infrared range, we propose a 3D bended metasurface configuration consisting of a metallic supported frame and cross vertical split ring resonators, which are fabricated by a focused ion beam defined origami method. The relationship between Q factor/modulation depth of the resonances and the geometric morphology of the meta-atoms are established, and its polarization insensitivity is verified. Two HQ resonances with 22%/26% modulation depth and the quality factor of 24/30 at 1.75/2.5 μ m are experimentally obtained in the optimized metasurface. In addition, a polarization insensitive Fano resonance with large modulation depth can also be observed at the low frequency band, which can be modulated by tuning the bending angle. This HQ 3D cross-bended metasurface will create a more flexible approach to design versatile micro/nano-photonic devices and biological components.