Albooyeh M, Kruk S, Menzel C, Helgert C, Kroll M, Krysinski A, Decker M, Neshev D N, Pertsch T, Etrich C, Rockstuhl C, Tretyakov S A, Simovski C R, Kivshar Yu S
Department of Radio Science and Engineering, Aalto University, 00076 Aalto, Finland.
Nonlinear Physics Centre, Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Sci Rep. 2014 Mar 27;4:4484. doi: 10.1038/srep04484.
Understanding the impact of order and disorder is of fundamental importance to perceive and to appreciate the functionality of modern photonic metasurfaces. Metasurfaces with disordered and amorphous inner arrangements promise to mitigate problems that arise for their counterparts with strictly periodic lattices of elementary unit cells such as, e.g., spatial dispersion, and allows the use of fabrication techniques that are suitable for large scale and cheap fabrication of metasurfaces. In this study, we analytically, numerically and experimentally investigate metasurfaces with different lattice arrangements and uncover the influence of lattice disorder on their electromagnetic properties. The considered metasurfaces are composed of metal-dielectric-metal elements that sustain both electric and magnetic resonances. Emphasis is placed on understanding the effect of the transition of the lattice symmetry from a periodic to an amorphous state and on studying oblique illumination. For this scenario, we develop a powerful analytical model that yields, for the first time, an adequate description of the scattering properties of amorphous metasurfaces, paving the way for their integration into future applications.
理解有序和无序的影响对于认识和欣赏现代光子超表面的功能至关重要。具有无序和非晶内部排列的超表面有望缓解其具有严格周期性基本单元晶格的对应物所出现的问题，例如空间色散，并允许使用适合大规模且廉价制造超表面的制造技术。在本研究中，我们通过解析、数值和实验方法研究了具有不同晶格排列的超表面，并揭示了晶格无序对其电磁特性的影响。所考虑的超表面由维持电谐振和磁谐振的金属 - 电介质 - 金属元件组成。重点在于理解晶格对称性从周期性状态转变为非晶态的影响以及研究斜入射照明。针对这种情况，我们开发了一个强大的解析模型，首次对非晶超表面的散射特性给出了充分描述，为将其集成到未来应用中铺平了道路。
