ISC-CNR, UOS Sapienza, P A Moro 2, 00185 Roma, Italy.
Nat Commun. 2013;4:1740. doi: 10.1038/ncomms2777.
Controlling the flow of energy in a random medium is a research frontier with a wide range of applications. As recently demonstrated, the effect of disorder on the transmission of optical beams may be partially compensated by wavefront shaping, but losing control over individual light paths. Here we demonstrate a novel physical effect whereby energy is spatially and spectrally transferred inside a disordered active medium by the coupling between individual lasing modes. We show that it is possible to transmit an optical resonance to a remote point by employing specific control over optical excitations, obtaining a random lasing system, which acts both as a switch and as an amplifier.
控制随机介质中的能量流是一个具有广泛应用前景的研究前沿。最近有人证明，通过波前整形可以部分补偿无序对光束传输的影响，但会失去对个别光路的控制。在这里，我们展示了一种新的物理效应，即通过个别激光模式之间的耦合，在无序的有源介质中实现能量的空间和光谱转移。我们表明，通过对光激发的特定控制，可以将光学共振传输到远程点，从而获得一个随机激光系统，它既可以作为开关，也可以作为放大器。
