Kim Dasom, Yun Hyeong Seok, Das Bamadev, Rhie Jiyeah, Vasa Parinda, Kim Young-Il, Choa Sung-Hoon, Park Namkyoo, Lee Dukhyung, Bahk Young-Mi, Kim Dai-Sik
Department of Physics and Center for Atom Scale Electromagnetism, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
Nano Lett. 2021 May 26;21(10):4202-4208. doi: 10.1021/acs.nanolett.1c00025. Epub 2021 Mar 12.
One of the most straightforward methods to actively control optical functionalities of metamaterials is to apply mechanical strain deforming the geometries. These deformations, however, leave symmetries and topologies largely intact, limiting the multifunctional horizon. Here, we present topology manipulation of metamaterials fabricated on flexible substrates by mechanically closing/opening embedded nanotrenches of various geometries. When an inner bending is applied on the substrate, the nanotrench closes and the accompanying topological change results in abrupt switching of metamaterial functionalities such as resonance, chirality, and polarization selectivity. Closable nanotrenches can be embedded in metamaterials of broadband spectrum, ranging from visible to microwave. The 99.9% extinction performance is robust, enduring more than a thousand bending cycles. Our work provides a wafer-scale platform for active quantum plasmonics and photonic application of subnanometer phenomena.
主动控制超材料光学功能的最直接方法之一是施加机械应变使几何形状变形。然而，这些变形在很大程度上保持了对称性和拓扑结构，限制了多功能的范围。在此，我们展示了通过机械闭合/打开各种几何形状的嵌入式纳米沟槽，对柔性基板上制造的超材料进行拓扑操作。当在基板上施加向内弯曲时，纳米沟槽闭合，随之而来的拓扑变化导致超材料功能（如共振、手性和偏振选择性）的突然切换。可闭合的纳米沟槽可以嵌入从可见光到微波的宽带光谱超材料中。99.9%的消光性能很稳定，能承受超过一千次的弯曲循环。我们的工作为亚纳米现象的主动量子等离子体和光子应用提供了一个晶圆级平台。
