Department of Physics and KAIST Institute of Health Science and Technology, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Nat Commun. 2016 Oct 31;7:13359. doi: 10.1038/ncomms13359.
The word 'holography' means a drawing that contains all of the information for light-both amplitude and wavefront. However, because of the insufficient bandwidth of current electronics, the direct measurement of the wavefront of light has not yet been achieved. Though reference-field-assisted interferometric methods have been utilized in numerous applications, introducing a reference field raises several fundamental and practical issues. Here we demonstrate a reference-free holographic image sensor. To achieve this, we propose a speckle-correlation scattering matrix approach; light-field information passing through a thin disordered layer is recorded and retrieved from a single-shot recording of speckle intensity patterns. Self-interference via diffusive scattering enables access to impinging light-field information, when light transport in the diffusive layer is precisely calibrated. As a proof-of-concept, we demonstrate direct holographic measurements of three-dimensional optical fields using a compact device consisting of a regular image sensor and a diffusor.
“全息术”一词的意思是包含所有光信息的图形——既有振幅又有波前。然而，由于当前电子技术的带宽不足，光的波前还不能直接测量。虽然参考场辅助干涉测量方法已经在许多应用中得到了利用，但引入参考场会带来一些基本的和实际的问题。在这里，我们展示了一种无参考的全息图像传感器。为了实现这一点，我们提出了一种散斑相关散射矩阵方法；通过记录穿过薄的无序层的光场信息，并从散斑强度图案的单次记录中进行检索。当精确校准漫射层中的光传输时，通过扩散散射进行的自干涉使得可以获取入射光场信息。作为概念验证，我们使用由常规图像传感器和漫射器组成的紧凑设备，直接对三维光场进行全息测量。
