Fujii Garuda, Akimoto Youhei
Opt Express. 2022 Feb 14;30(4):6090-6106. doi: 10.1364/OE.450787.
Various strategies have been proposed to achieve invisibility cloaking, but usually only one phenomenon is controlled by each device. Cloaking an object from two different waves, such as electromagnetic and acoustic waves, is a challenging problem, if not impossible, to be achieved using transformation theory and metamaterials, which are the major approaches in physics. Here, by developing topology optimization for controlling both electromagnetic and acoustic waves, we present a multidisciplinary attempt for designing biphysical cloaks with triple-wave cloaking capabilities, specifically for E- and H-polarized waves and acoustic wave. The topology-optimized biphysical cloak cancels the scattering of the three waves and reproduces the original propagating waves as if nothing is present, thus instilling the desired cloaking capability. In addition, we describe cloaking structures for multiple incident directions of the three waves and structures that work for both electromagnetic waves and sound waves of different wavelengths.
为实现隐形隐身已经提出了各种策略，但通常每个装置只能控制一种现象。使用变换理论和超材料（物理学中的主要方法）来使物体对两种不同的波（如电磁波和声波）隐形，即使并非不可能，也是一个具有挑战性的问题。在这里，通过开发用于控制电磁波和声波的拓扑优化方法，我们进行了多学科尝试，以设计具有三波隐身能力的双物理隐身衣，特别是针对E偏振波、H偏振波和声波。经过拓扑优化的双物理隐身衣消除了这三种波的散射，并再现了原始的传播波，就好像没有任何东西存在一样，从而赋予了所需的隐身能力。此外，我们还描述了针对这三种波的多个入射方向的隐身结构，以及适用于不同波长的电磁波和声波的结构。
