Non-invasive three-dimension control of light between turbid layers using a surface quasi-point light source for precorrection

Complex amplitude field recovery of a scattering media obstructed object with multi-captured images

An iterative-based method for recovering the complex amplitude field behind scattering media is presented in this Letter. This method compensates the random phase modulation of scattering media by using multiple captured scattered light fields. Complex amplitude reconstruction with local iterative averaging of scattered light fields, and double weighted feedback is efficiently applied. Two feasible types of system setups, with varying detector positions and wavelength, are proposed. Simulations and proof-of-concept experiments are employed to demonstrate the effectiveness of the proposed method in reconstructing complex amplitude of a hidden target.

Realistic phase screen model for forward multiple-scattering media

Existing random phase screen (RPS) models for forward multiple-scattering media fail to incorporate ballistic light. In this Letter, we redesign the angular spectrum of the screen by means of Monte Carlo simulation based on an assumption that a single screen should represent all the scattering events a photon experiences between two adjacent screens. Three examples demonstrate that the proposed model exhibits more realistic optical properties than conventional RPS models in terms of attenuation of ballistic light, evolution of beam profile, and angular memory effect. The proposed model also provides the flexibility to balance the computing accuracy, speed, and memory usage by tuning the screen spacing.

Bidirectional image transmission through physically thick scattering media using digital optical phase conjugation

We demonstrate the feasibility of bidirectional image transmission through a physically thick scattering medium within its memory effect range by digital optical phase conjugation. We show the bidirectional transmission is not simply the consequence of optical reciprocity. We observe that when the spatial light modulator (the device performing the digital optical phase conjugation) is relayed to the middle plane of the medium, the memory effect will be fully exploited and thus the transmitted images will have maximum field of view (FOV). Furthermore, we show that the FOV can be expanded n times by performing n times wavefront measurements.