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22 February 2010 Metamaterial based devices for terahertz imaging
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The terahertz (THz) region has been shown to have considerable application potential for spectroscopic imaging, nondestructive imaging through nonpolar, nonmetallic materials and imaging of biological materials. These applications have all been possible due to the recent progress in THz sources, detectors and measurement techniques. However, only moderate progress has been made in developing passive and active devices to control and manipulate THz radiation, which can enhance current imaging capabilities. One promising approach for implementing passive and active devices at THz frequencies are metamaterials - composite materials designed to have specific electromagnetic properties not found in naturally occurring materials. The most common implementation utilizes a metallic resonant particle periodically distributed in an insulator matrix where the periodicity is significantly smaller than the wavelength of operation. We have designed and implemented three metamaterial based devices with potential applications to THz imaging. We present an electrically-driven active metamaterial which operates as an external modulator for a ~2.8 THz CW quantum cascade laser. We obtained a modulation depth of ~60%. We also demonstrate a polarization sensitive metamaterial which can be used as a continuously variable attenuator or as a wave plate. The latter may be useful for the development of THz phase contrast imaging.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xomalin G. Peralta, Michael C. Wanke, Igal Brener, Jerry Waldman, William D. Goodhue, J. Li, Abul K. Azad, Hou-Tong Chen, Antoinette J. Taylor, and John F. O'Hara "Metamaterial based devices for terahertz imaging", Proc. SPIE 7562, Optical Interactions with Tissues and Cells XXI, 75620I (22 February 2010);

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