Nonlinear Self-Action of Light through Biological Suspensions
Nonlinear Self-Action of Light through Biological Suspensions
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DOI：
10.1103/physrevlett.119.058101
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发表时间：
2017-08-04
影响因子：
8.6
通讯作者：
Chen, Zhigang
中科院分区：
文献类型：
--
作者：
Bezryadina, Anna;Hansson, Tobias;Chen, Zhigang
人们普遍认为生物介质不能表现出明显的非线性光学响应。据我们所知，我们第一次展示了蓝藻悬浮液中的可调光学非线性，这导致了光束的强劲繁殖和强烈的自我作用。通过故意改变海洋细菌的宿主环境，我们在实验中证明，非线性相互作用可以导致细菌悬浮液对光的深度穿透或增强散射，同时细胞的活性保持不变。建立了一个理论模型，表明作用在细菌上的光学力(包括梯度力和前向散射力)所介导的非局部非线性解释了我们的实验观察。
It is commonly thought that biological media cannot exhibit an appreciable nonlinear optical response. We demonstrate, for the first time to our knowledge, a tunable optical nonlinearity in suspensions of cyanobacteria that leads to robust propagation and strong self-action of a light beam. By deliberately altering the host environment of the marine bacteria, we show experimentally that nonlinear interaction can result in either deep penetration or enhanced scattering of light through the bacterial suspension, while the viability of the cells remains intact. A theoretical model is developed to show that a nonlocal nonlinearity mediated by optical forces (including both gradient and forward-scattering forces) acting on the bacteria explains our experimental observations.