Time-Reversed Lasing and Interferometric Control of Absorption
Time-Reversed Lasing and Interferometric Control of Absorption
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DOI：
10.1126/science.1200735
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发表时间：
2011-02-18
期刊：
影响因子：
56.9
通讯作者：
Cao, Hui
中科院分区：
文献类型：
--
作者：
Wan, Wenjie;Chong, Yidong;Cao, Hui
在激光发射的时间反演对应物中，入射相干光场在包含损耗介质而不是增益介质的谐振腔中被完全吸收。入射光场和频率必须与相应增益激光场和频率一致。我们证明了这种效果的两个反向传播的入射场在硅腔，表明吸收可以增强两个数量级，最大的理论预测为我们的实验装置。此外，我们发现，吸收可以大大减少通过改变入射场的相对相位。该器件被称为“相干完美吸收体”，其功能类似于吸收干涉仪，在集成光学中具有潜在的实际应用。
In the time-reversed counterpart to laser emission, incident coherent optical fields are perfectly absorbed within a resonator that contains a loss medium instead of a gain medium. The incident fields and frequency must coincide with those of the corresponding laser with gain. We demonstrated this effect for two counterpropagating incident fields in a silicon cavity, showing that absorption can be enhanced by two orders of magnitude, the maximum predicted by theory for our experimental setup. In addition, we showed that absorption can be reduced substantially by varying the relative phase of the incident fields. The device, termed a "coherent perfect absorber," functions as an absorptive interferometer, with potential practical applications in integrated optics.