Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Republic of Singapore.
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Republic of Singapore and Department of Physics and Centre for Computational Science and Engineering, National University of Singapore, Singapore 117546, Republic of Singapore and NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore,Kent Ridge 119620, Republic of Singapore.
Phys Rev Lett. 2014 Feb 7;112(5):054302. doi: 10.1103/PhysRevLett.112.054302. Epub 2014 Feb 3.
Invisibility has attracted intensive research in various communities, e.g., optics, electromagnetics, acoustics, thermodynamics, dc, etc. However, many experimental demonstrations have only been achieved by virtue of simplified approaches due to the inhomogeneous and extreme parameters imposed by the transformation-optic method, and usually require a challenging realization with metamaterials. In this Letter, we demonstrate a bilayer thermal cloak made of bulk isotropic materials, and it has been validated as an exact cloak. We experimentally verified its ability to maintain the heat front and its heat protection capabilities in a 2D proof-of-concept experiment. The robustness of this scheme is validated in both 2D (including oblique heat front incidence) and 3D configurations. The proposed scheme may open a new avenue to control the diffusive heat flow in ways inconceivable with phonons, and also inspire new alternatives to the functionalities promised by transformation optics.
隐形已经吸引了各个领域的深入研究，例如光学、电磁学、声学、热力学、直流电等。然而，由于变换光学方法所施加的不均匀和极端参数，许多实验演示仅通过简化方法得以实现，并且通常需要使用超材料来实现具有挑战性的目标。在这封信件中，我们展示了一种由各向同性块状材料制成的双层热隐形衣，并且已经验证了它作为精确隐形衣的性能。我们在二维概念验证实验中实验验证了其保持热前沿和热保护能力的能力。该方案的稳健性已经在二维（包括斜入射热前沿）和三维配置中得到验证。所提出的方案可能为控制扩散热流开辟了新途径，这种途径是利用声子无法实现的，并且还为变换光学所承诺的功能提供了新的选择。
