Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2010 Jul 30;105(5):053901. doi: 10.1103/PhysRevLett.105.053901. Epub 2010 Jul 26.
We show that an arbitrary body or aggregate can be made perfectly absorbing at discrete frequencies if a precise amount of dissipation is added under specific conditions of coherent monochromatic illumination. This effect arises from the interaction of optical absorption and wave interference and corresponds to moving a zero of the elastic S matrix onto the real wave vector axis. It is thus the time-reversed process of lasing at threshold. The effect is demonstrated in a simple Si slab geometry illuminated in the 500-900 nm range. Coherent perfect absorbers act as linear, absorptive interferometers, which may be useful as detectors, transducers, and switches.
我们表明，如果在相干单色照明下特定条件下添加精确的耗散量，任意物体或聚集体都可以在离散频率下实现完美吸收。这种效应源于光学吸收和波干涉的相互作用，相当于将弹性 S 矩阵的零点移动到实波矢轴上。因此，它是阈值激光的时间反转过程。这种效应在一个简单的 Si 平板几何结构中在 500-900nm 范围内得到了演示。相干完美吸收体充当线性、吸收性干涉仪，它们可用作探测器、传感器和开关。
