Coherent superposition of terahertz beams

Sascha Preu; Stefan Malzer; Gottfried H. Döhler; Lijun J. Wang

doi:10.1117/12.800250

2 October 2008 Coherent superposition of terahertz beams

Sascha Preu, Stefan Malzer, Gottfried H. Döhler, Lijun J. Wang

Proceedings Volume 7117, Millimetre Wave and Terahertz Sensors and Technology; 71170S (2008) https://doi.org/10.1117/12.800250
Event: SPIE Security + Defence, 2008, Cardiff, Wales, United Kingdom

Abstract

We report on simulations of arrays of free standing THz sources for high brightness applications in THz active imaging and sensing. THz-photomixing sources for wide tunable, room-temperature, narrow linewidth, and CW operation are considered. All the source elements are coherently driven to allow for controlled interference of the beam pattern. The center peak not only gains more power but also becomes much narrower due to interference, compared to a single emitter. The peak intensity increases with the square of the number of sources. This can improve both the resolution and the dynamic range for stand-off active imaging and sensing applications. We discuss the effect of different source layouts with respect to the illumination pattern on the target.

Citation Download Citation

Sascha Preu, Stefan Malzer, Gottfried H. Döhler, and Lijun J. Wang "Coherent superposition of terahertz beams", Proc. SPIE 7117, Millimetre Wave and Terahertz Sensors and Technology, 71170S (2 October 2008); https://doi.org/10.1117/12.800250

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