Propagation of waves in a two-photon absorbing medium

H.‐H. Ritze, A. Bandilla

Lalruatfela Renthlei, Harshawardhan Wanare, S. Anantha Ramakrishna

We demonstrate enhanced wavelike character of diffuse photon density waves (DPDW) in an amplifying random medium. The amplifying nature makes it necessary to choose the wave solution that grows inside the amplifying medium, and has a propagation vector pointing opposite to the growth direction. This results in negative refraction of the DPDW at an absorbing-amplifying random medium interface as well as the possibility of supporting ``anti''-surface-like modes at the interface. A slab of an amplifying random medium sandwiched between two absorbing random media supports waveguide resonances that can be utilized to extend the imaging capabilities of DPDW.

Govind Prasad Agrawal, Christos Flytzanis

Guram T. Adamashvili

I. R. Khairulin, E. V. Radeonychev

In this paper, we consider the effect of the emergence of transparency of a resonantly absorbing medium for electromagnetic radiation due to the excitation of piston-like acoustic oscillations of the medium along the direction of radiation propagation – acoustically induced transparency. The physical mechanism and basic conditions for the implementation of the effect are discussed, as well as its application to reduce the propagation velocity of gamma-ray photons and on-demand recovery of an arbitrary part of a single-photon wave packet resonantly absorbed in the medium.

清 西川, 昭 佐道, Hiroshi Sekiya +3 more