微波食品加热
微波成像
太赫兹辐射
光学
光谱成像
多路复用
计算机科学
编码孔径
光圈(计算机存储器)
干涉测量
物理
声学
电信
探测器
作者
Aaron V. Diebold,Mohammadreza F. Imani,Thomas Fromentèze,Daniel L. Marks,David R. Smith
出处
期刊:Optica
[Optica Publishing Group]
日期:2020-04-20
卷期号:7 (5): 527-527
被引量:35
标识
DOI:10.1364/optica.386516
摘要
Passive microwave imaging of incoherent sources is often approached in a lensless configuration through array-based interferometric processing. We present an alternative route in the form of a coded aperture realized using a dynamic metasurface. We demonstrate that this device can achieve an estimate of the spectral source distribution from a series of single-port spectral magnitude measurements and complex characterization of the modulation patterns. The image estimation problem is formulated in this case as compressive inversion of a set of standard linear matrix equations. In addition, we demonstrate that a dispersive metasurface design can achieve spectral encoding directly, offering the potential for spectral imaging from frequency-integrated, multiplexed measurements. The microwave dynamic metasurface aperture as an encoding structure is shown to comprise a substantially simplified hardware architecture than that employed in common passive microwave imaging systems. Our proposed technique can facilitate large scale microwave imaging applications that exploit pervasive ambient sources, while similar principles can readily be applied at terahertz, infrared, and optical frequencies.
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