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Cloaking; random medium; diffuse photon density waves; scattering

Enhancement of wave-like characteristics of heavily damped diffuse photon density waves in a random medium by amplification can induce strongly localised resonances. These resonances can be used to either suppress or enhance scattering from an inhomogeneity in the random medium by cloaking the inhomogeneous region by a shell of random medium with the correct levels of absorption or amplification. A spherical core–shell structure consisting of a shell of a random amplifying medium is shown to enhance or suppress specific resonant modes. A shell with an absorbing random medium is also shown to suppress scattering which can also be used for cloaking the core region.

LALRUATFELA RENTHLEI¹ S ANANTHA RAMAKRISHNA¹ HARSHAWARDHAN WANARE¹

1. Department of Physics, Indian Institute of Technology, Kanpur 208 016, India

Published

5 July 2018

Manuscript received

12 July 2017

Manuscript revised

26 December 2017

Accepted

2 January 2018

Early published

Unedited version published online

Final version published online

22 May 2018