A simple Mie-resonator based meta-array with diverse deflection scenarios enabling multifunctional operation at near-infrared

Nanophotonics

article

Majid Aalizadeh¹  Andriy E. Serebryannikov³  Ekmel Ozbay⁴  Guy A. E. Vandenbosch⁵ 

[1] Department of Electrical and Computer Engineering, University of Michigan;Nanotechnology Research Center (NANOTAM), Bilkent University;Department of Physics, Adam Mickiewicz University;Nanotechnology Research Center (NANOTAM), Institute of Nanotechnology and Materials Science (UNAM), Department of Physics, Department of Electrical Engineering, Bilkent University;Katholieke Universiteit Leuven

关键词: deflection;    meta-array;    Mie resonance;    multifunctionality;    spatial filtering;    splitting;   

DOI  :  10.1515/nanoph-2020-0386

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Deflection, a basic functionality of wavefront manipulation is usually associated with the phase-gradient metasurfaces and the classical blazed gratings. We numerically and experimentally demonstrate an unusually wideband and simultaneously wide-angle deflection achieved at near-infrared in reflection mode for a periodic (nongradient), ultrathin meta-array comprising only one silicon nanorod (Mie resonator) per period. It occurs in the range where only the first negative diffraction order and zero order may propagate. Deflection serves as the enabler for multifunctional operation. Being designed with the main goal to obtain ultra-wideband and wide-angle deflection, the proposed meta-array is also capable in spatial filtering and wide-angle splitting. Spatial filtering of various types can be obtained in one structure by exploiting either deflection in nonzero diffraction orders, or the specular-reflection (zero-order) regime. Thus, the role of different diffraction orders is clarified. Moreover, on – off switching of deflection and related functionalities is possible by changing polarization state of the incident wave. The suggested device is simple to fabricate and only requires cost-effective materials, so it is particularly appropriate for the large-area fabrication using nanoprint lithography. Ultra-wideband wide-angle and other deflection scenarios, along with the other functionalities, are promising for applications in optical communications, laser optics, sensing, detection, and imaging.

【 授权许可】

CC BY