We investigate the imaging capabilities of a one-dimensional, dynamic, metamaterial aperture that operates at the lower part of K-band microwave frequencies (17.5–21.1 GHz). The dynamic aperture consists of a microstrip transmission line with an array of radiating, complementary, subwavelength metamaterial irises patterned into the upper conductor. Diodes integrated into the metamaterial resonators provide voltage-controlled switching of the resonant metamaterial elements between radiating and nonradiating states. Applying a series of on/off patterns to the metamaterial resonators produces a series of distinct radiation patterns that sequentially illuminate a scene. The backscattered signal contains encoded scene information over a set of measurements that can be postprocessed to reconstruct an image. We present a series of design considerations for the dynamic aperture, as well as a series of experimental studies performed using a dynamic aperture prototype. High-fidelity, real-time, diffraction-limited imaging using the prototype is demonstrated. The dynamic aperture suggests a path to fast and reliable imaging with low-cost and versatile hardware, for a variety of applications including security screening, biomedical diagnostics, and through-wall imaging.
© 2016 Optical Society of AmericaFull Article | PDF Article
12 May 2016: A correction was made to the author affiliations.
OSA Recommended Articles
Aaron V. Diebold, Mohammadreza F. Imani, Timothy Sleasman, and David R. Smith
Appl. Opt. 57(9) 2142-2149 (2018)
Timothy Sleasman, Michael Boyarsky, Mohammadreza F. Imani, Thomas Fromenteze, Jonah N. Gollub, and David R. Smith
J. Opt. Soc. Am. B 34(8) 1713-1726 (2017)
Guy Lipworth, Alex Mrozack, John Hunt, Daniel L. Marks, Tom Driscoll, David Brady, and David R. Smith
J. Opt. Soc. Am. A 30(8) 1603-1612 (2013)