Realization of superabsorption by time reversal of superradiance
Realization of superabsorption by time reversal of superradiance
复制标题
通过超辐射时间反转实现超吸收
DOI：
10.1038/s41566-021-00770-6
复制
发表时间：
2019
期刊：
影响因子：
35
通讯作者：
K. An
中科院分区：
文献类型：
--
作者：
Daeho Yang;Seung;Junseok Han;Gibeom Son;Jinuk Kim;Junki Kim;Moonjoo Lee;K. An
光的发射和吸收是光与物质相互作用的核心。虽然发射和吸收速率被认为是原子和分子的固有属性，但在量子信息处理2、计量学3和光能采集4等应用中，人们已经找到了各种修改这些速率的方法。一种有希望的方法是以与超辐射相同的方式利用发射体的集体行为5。虽然超辐射已经在不同的系统3、6-10中被观测到，但它在吸收方面的概念上的对应关系直到现在才被实现。在这里，我们演示了通过实现超辐射的时间反转过程来增强合作吸收--超吸收。观察到的超吸收速率远高于普通吸收，吸收的光子数与原子数的平方成比例关系，表现出超吸收的协作性。目前的超吸收--其性能超越了传统吸收的限制--可以促进微弱信号的感知1、光能收集11和光-物质量子界面2。现在已经观察到了超辐射的对应物，称为超吸收。超吸收速率比普通吸收要高得多，可能会使微弱信号得到利用。
Emission and absorption of light lie at the heart of light–matter interaction1. Although emission and absorption rates are regarded as intrinsic properties of atoms and molecules, various ways to modify these rates have been sought in applications such as quantum information processing2, metrology3 and light-energy harvesting4. One promising approach is to utilize collective behaviour of emitters in the same way as in superradiance5. Although superradiance has been observed in diverse systems3,6–10, its conceptual counterpart in absorption has never been realized11 until now. Here we demonstrate enhanced cooperative absorption—superabsorption—by implementing a time-reversal process of superradiance. The observed superabsorption rate is much higher than that of ordinary absorption, with the number of absorbed photons scaling with the square of the number of atoms, exhibiting the cooperative nature of superabsorption. The present superabsorption—which performs beyond the limitations of conventional absorption—can facilitate weak-signal sensing1, light-energy harvesting11 and light–matter quantum interfaces2. The counterpart of superradiance, called superabsorption, has now been observed. Superabsorption rates are much higher than that of ordinary absorption and may enable weak-signal exploitation.