Farhat Mohamed, Guenneau Sebastien, Puvirajesinghe Tania, Alharbi Fahhad H
Opt Express. 2018 Sep 17;26(19):24792-24803. doi: 10.1364/OE.26.024792.
We make use of transformation optics technique to realize cloaking operation in the light diffusive regime, for spherical objects. The cloak requires spatially heterogeneous anisotropic diffusivity, as well as spatially varying speed of light and absorption. Analytic calculations of Photon's fluence confirm minor role of absorption in reduction of far-field scattering, and a monopole fluence field converging to a constant in the static regime in the invisibility region. The latter is in contrast to acoustic and electromagnetic cloaks, for which the field vanishes inside the core. These results are finally discussed in the context of mass diffusion, where cloaking can be achieved with a heterogeneous anisotropic diffusivity.
我们利用变换光学技术，针对球形物体在光扩散区域实现隐身操作。该隐身装置需要空间非均匀的各向异性扩散率，以及空间变化的光速和吸收率。光子注量的解析计算证实了吸收在减少远场散射方面作用较小，并且在隐身区域的静态状态下，单极子注量场收敛到一个常数。这与声学和电磁隐身装置形成对比，在声学和电磁隐身装置中，核心区域内的场为零。最后，我们在质量扩散的背景下讨论了这些结果，在质量扩散中，可以通过非均匀各向异性扩散率实现隐身。
