Jang M, Yang C, Vellekoop I M
Electrical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
Biomedical Photonic Imaging Group, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.
Phys Rev Lett. 2017 Mar 3;118(9):093902. doi: 10.1103/PhysRevLett.118.093902.
We demonstrate experimentally that optical phase conjugation can be used to focus light through strongly scattering media even when far less than a photon per optical degree of freedom is detected. We found that the best achievable intensity contrast is equal to the total number of detected photons, as long as the resolution of the system is high enough. Our results demonstrate that phase conjugation can be used even when the photon budget is extremely low, such as in high-speed focusing through dynamic media or imaging deep inside tissue.
我们通过实验证明，即使在每光学自由度检测到的光子远少于一个的情况下，光学相位共轭也可用于通过强散射介质聚焦光。我们发现，只要系统分辨率足够高，可实现的最佳强度对比度等于检测到的光子总数。我们的结果表明，即使在光子预算极低的情况下，例如在通过动态介质进行高速聚焦或对组织深部进行成像时，相位共轭也可使用。
