Exploiting scattering media for exploring 3D objects

• 来源期刊: 光：科学与应用（英文版）
• 关键词: intensity correlation technique lensless imaging scattering media 3D imaging
• 年，卷（期）: 2017,（1）
• 页码范围: 133-139
• 页数: 7页
• 语种: 英文
• DOI: 10.1038/lsa.2016.219

摘要

Scattering media, such as diffused glass and biological tissue, are usually treated as obstacles in imaging.To cope with the random phase introduced by a turbid medium, most existing imaging techniques recourse to either phase compensation by optical means or phase recovery using iterative algorithms, and their applications are often limited to two-dimensional imaging.In contrast, we utilize the scattering medium as an unconventional imaging lens and exploit its lens-like properties for lensless threedimensional (3D) imaging with diffraction-limited resolution.Our spatially incoherent lensless imaging technique is simple and capable of variable focusing with adjustable depths of focus that enables depth sensing of 3D objects that are concealed by the diffusing medium.Wide-field imaging with diffraction-limited resolution is verified experimentally by a single-shot recording of the 1951 USAF resolution test chart, and 3D imaging and depth sensing are demonstrated by shifting focus over axially separated objects.