Coherent control of light for non-line-of-sight imaging
arXiv:1908.04094 · doi:10.1103/PhysRevApplied.12.064045
Abstract
Non-line-of-sight (NLOS) imaging relies on collecting light that is rendered incoherent from the multiple scattering events and is then post-processed to provide an estimate of the hidden scene. Here we employ coherent phase control of the outgoing laser beam phase front so as to refocus the beam behind the obscuring obstacle and then use the speckle memory effect to scan the focused spot across the scene. The back-reflected light intensity provides a direct measurement of the scene with a signal-to-noise ratio that is greatly improved when measured using a temporally gated detector. A spatial resolution of less than 1 mm is demonstrated, opening the way to high-resolution NLOS imaging.
References in corpus (9)
- Random-Matrix Theory of Quantum Transport
- Measuring the Transmission Matrix in Optics : An Approach to the Study and Control of Light Propagation in Disordered Media
- Non-invasive real-time imaging through scattering layers and around corners via speckle correlations
- Phase control algorithms for focusing light through turbid media
- Controlling Light Through Optical Disordered Media : Transmission Matrix Approach
- Noninvasive nonlinear imaging through strongly-scattering turbid layers
- Ultrahigh enhancement of light focusing through disordered media controlled by Megapixel modes
- A trillion frames per second: the techniques and applications of light-in-flight photography
- Blind focusing through strongly scattering media using wavefront shaping with nonlinear feedback