Mr. Thilo May Profile

Thilo May

at Univ Frankfurt am Main

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Proceedings Article | 4 May 2007 Paper

Towards an active real-time THz camera: first realization of a hybrid system

T. May, C. am Weg, A. Alcin, B. Hils, T. Löffler, H. Roskos

Proceedings Volume 6549, 654907 (2007) https://doi.org/10.1117/12.719197

KEYWORDS: Terahertz radiation, Imaging systems, Sensors, Mirrors, Electro optics, Scanners, Reflectors, Raster graphics, Signal detection, Cameras

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We report the realization of a hybrid system for stand-off THz reflectrometry measurements. The design combines the best of two worlds: the high radiation power of sub-THz micro-electronic emitters and the high sensitivity of coherent opto-electronic detection. Our system is based on a commercially available multiplied Gunn source with a cw output power of 0.6 mW at 0.65 THz. We combine it with electro-optic mixing with femtosecond light pulses in a ZnTe crystal. This scheme can be described as heterodyne detection with a Ti:sapphire fs-laser acting as local oscillator and therefore allows for phase-sensitive measurements. Example images of test objects are obtained with mechanical scanning optics and with measurement times per pixel as short as 10 ms. The test objects are placed at a distance of 1 m from the detector and also from the source. The results indicate diffraction-limited resolution. Different contrast mechanisms, based on absorption, scattering, and difference in optical thickness are employed. Our evaluation shows that it should be possible to realize a real-time multi-pixel detector with several hundreds of pixels and a dynamic range of at least two orders of magnitude in power.

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