Design of diamond-shaped transient thermal cloaks with homogeneous isotropic materials

• Published in: Frontiers of physics Vol. 11; no. 5; pp. 111 - 117
• Main Author: 李廷华 朱东来 毛福春 黄铭 杨晶晶 李寿波
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.10.2016; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Atomic; Condensed Matter Physics; Coordinate transformations; Effective medium theory; Homogeneity; Isotropic material; metamaterials; Molecular; Optical and Plasma Physics; Optics; Parameters; Particle and Nuclear Physics; Physics; Physics and Astronomy; Research Article; thermal cloak; transformation thermodynamics; 变换光学; 各向同性; 坐标变换; 有效介质理论; 材料参数; 瞬态; 菱形; 设计; metamaterials; effective medium theory; transformation thermodynamics; thermal cloak
• ISSN: 2095-0462; 2095-0470
• DOI: 10.1007/s11467-016-0575-4

Transformation thermodynamics as a major extension of transformation optics has recently received considerable attention. In this paper, we present two-dimensional (2D) and three-dimensional (3D) diamond-shaped transient thermal cloaks with non-singular homogeneous material parameters. The absence of singularity in the parameters results from the fact that the linear coordinate transformation is performed by expanding a line segment rather than a point into a region, while the mechanism behind the homogeneity is the homogeneous stretching and compression along orthogonal directions during the transformation. Although the derived parameters remain anisotropic, we further show that this can be circumvented by considering a layered structure composed of only four types of isotropic materials based on the effective medium theory. Numerical simulation results confirm the good performance of the proposed cloaks.