Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Sci Rep. 2017 Aug 29;7(1):9792. doi: 10.1038/s41598-017-10450-7.
Manipulating light non-invasively through inhomogeneous media is an attractive goal in many disciplines. Wavefront shaping and optical phase conjugation can focus light to a point. Transmission matrix method can control light on multiple output modes simultaneously. Here we report a non-invasive approach which enables three-dimension (3D) light control between two turbid layers. A digital optical phase conjugation mirror measured and conjugated the diffused wavefront, which originated from a quasi-point source on the front turbid layer and passed through the back turbid layer. And then, because of memory effect, the phase-conjugated wavefront could be used as a carrier wave to transport a pre-calculated wavefront through the back turbid layer. The pre-calculated wavefront could project a desired 3D light field inside the sample, which, in our experiments, consisted of two 220-grid ground glass plates spaced by a 20 mm distance. The controllable range of light, according to the memory effect, was calculated to be 80 mrad in solid angle and 16 mm on z-axis. Due to the 3D light control ability, our approach may find applications in photodynamic therapy and optogenetics. Besides, our approach can also be combined with ghost imaging or compressed sensing to achieve 3D imaging between turbid layers.
通过非均匀介质对光进行非侵入式操控是许多学科的一个诱人目标。波前整形和光相位共轭可以将光聚焦到一个点。传输矩阵方法可以同时控制多个输出模式的光。在这里，我们报告了一种非侵入式方法，该方法可以在两个混浊层之间实现三维（3D）光控制。数字光学相位共轭镜测量并共轭了漫射波前，该波前源于前混浊层上的准点源，并穿过后混浊层。然后，由于记忆效应，相位共轭波前可以用作载波，通过后混浊层传输预先计算的波前。预先计算的波前可以在样品内部投射出所需的 3D 光场，在我们的实验中，该光场由两个相距 20 毫米的 220 网格毛玻璃板组成。根据记忆效应，光的可控范围计算为 80 毫弧度立体角和 16 毫米 z 轴。由于具有 3D 光控制能力，我们的方法可能在光动力疗法和光遗传学中找到应用。此外，我们的方法还可以与幽灵成像或压缩感知相结合，在混浊层之间实现 3D 成像。
