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Proceedings Paper

Coded and compressive THz imaging with metamaterials
Author(s): Claire M. Watts; David Shrekenhamer; John Montoya; Guy Lipworth; John Hunt; Timothy Sleasman; Sanjay Krishna; David R. Smith; Willie J. Padilla
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Paper Abstract

Imaging in long wavelength regimes holds huge potential in many fields, from security to skin cancer detection. However, it is often difficult to image at these frequencies – the so called ‘THz gap1’ is no exception. Current techniques generally involve mechanically raster scanning a single detector to gain spatial information2, or utilization of a THz focal plane array (FPA)3. However, raster scanning results in slow image acquisition times and FPAs are relatively insensitive to THz radiation, requiring the use of high powered sources. In a different approach, a single pixel detector can be used in which radiation from an object is spatially modulated with a coded aperture to gain spatial information. This multiplexing technique has not fully taken off in the THz regime due to the lack of efficient coded apertures, or spatial light modulators (SLMs), that operate in this regime. Here we present the implementation of a single pixel THz camera using an active SLM. We use metamaterials to create an electronically controllable SLM, permitting the acquisition of high-fidelity THz images. We gain a signal-to-noise advantage over raster scanning schemes through a multiplexing technique4. We also use a source that is orders of magnitude lower in power than most THz FPA implementations3,5. We are able to utilize compressive sensing algorithms to reduce the number of measurements needed to reconstruct an image, and hence increase our frame rate to 1 Hz. This first generation device represents a significant step towards the realization of a single pixel THz camera.

Paper Details

Date Published: 7 March 2014
PDF: 10 pages
Proc. SPIE 8985, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII, 89851N (7 March 2014); doi: 10.1117/12.2058082
Show Author Affiliations
Claire M. Watts, Boston College (United States)
David Shrekenhamer, Boston College (United States)
John Montoya, The Univ. of New Mexico (United States)
Guy Lipworth, Duke Univ. (United States)
John Hunt, Duke Univ. (United States)
Timothy Sleasman, Boston College (United States)
Sanjay Krishna, The Univ. of New Mexico (United States)
David R. Smith, Duke Univ. (United States)
Willie J. Padilla, Boston College (United States)

Published in SPIE Proceedings Vol. 8985:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII
Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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