Science Daily  November 17, 2021
A team of researchers in the US (Northwestern University, Southern Methodist University) has invented a new method called synthetic wavelength holography. By capturing the entire light field of an object in a hologram, it is possible to reconstruct the object’s three-dimensional shape in its entirety. They captured holographic imaging around a corner or through scatterers — with synthetic waves instead of normal light waves. From there, an algorithm reconstructed the scattered light signal to reveal the hidden objects. The system could rapidly capture full-field images of large areas with submillimeter precision. To eliminate the need for fast detectors they merged light waves from two lasers to generate a synthetic light wave that could be specifically tailored to holographic imaging in different scattering scenarios. According to the researchers the current sensor prototypes used visible or infrared light, but the principle is universal and could be extended to other wavelengths. The work opens a plethora of new Non-Line-of-Sight imaging applications ranging from medical imaging and forensics to early-warning navigation systems and reconnaissance…read more. Open Access TECHNICAL ARTICLEÂ
Schematics of SWH for NLoS imaging around corners and NLoS imaging through scattering media. Credit: Nature Communications volume 12, Article number: 6647 (2021)Â