Michael Raju, Baptiste Jayet, Stefan Andersson-Engels
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引用次数: 0
摘要
我们开发了一种二维有限差分时域(FDTD)方法,用于模拟无序介质中波前整形应用的时空调制导星。时空调制一般(声光效应就是一个特别的例子)在这里被用作光在无序环绕的标记区域周围横向限制的导星。迭代光学相位共轭(IOPC)方法与导星一起用于克服多重散射导致的光扩散。利用相位敏感的锁相检测技术来估算从导星区域出现的调制波面的稳态振幅和相位,这些波面在拉曼-纳特机制下持续工作。由于 IOPC 方案会自然收敛到最大传输特征通道轮廓,因此可以利用导星在无序状态中的位置来引导通过标记区域的最大传输。用 MATLAB® 开发的相关代码以开放源代码(MIT 许可)的形式提供。代码包的缩写为 STAR-FDTD,其中 STAR 代表时空调制声光导引星。
STAR-FDTD: space-time modulated acousto-optic guidestar in disordered media
We developed a 2D Finite-difference time-domain (FDTD) method for modeling a space-time modulated guidestar targeting wavefront shaping applications in disordered media. Space-time modulation in general (a particular example being the acousto-optic effect) is used here as a guidestar for the transverse confinement of light around the tagged region surrounded by disorder. Together with the guidestar, the iterative optical phase conjugation (IOPC) method is used to overcome the diffusion of light due to multiple scattering. A phase sensitive lock-in detection technique is utilized to estimate the steady-state amplitude and phase of the modulated wavefronts emerging from the guidestar region continuously operating in the Raman-Nath regime. As the IOPC scheme naturally converges to the maximally transmitting eigenchannel profile, one could use the position of the guidestar within the disorder to channelize the maximal transmission through the tagged region. The associated code developed in MATLAB® is provided as an open source (The MIT License) package. The code package is referred by the acronym STAR-FDTD where STAR stands for Space-Time modulated Acousto-optic guidestaR.