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Handbook of Terahertz Technology for Imaging, Sensing and Communications by D Saeedkia

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11

State-of-the-art in terahertz continuous-wave photomixer systems

A. Deninger,     Toptica Photonics AG, Germany

Abstract:

This chapter reviews terahertz generation via heterodyne difference frequency generation, or ‘photomixing’. Key aspects of photomixer and antenna design are summarized, considering both photoconductive emitters and p-i-n diodes. The most common photoconductor material, GaAs, requires laser excitation below 870 nm, and ‘defect engineering’ is applied to maximize the terahertz bandwidth. p-i-n diodes, by contrast, are based on InGaAs/InP and are driven at 1.5 μm, taking advantage of compact laser sources developed for optical communication systems. The chapter further includes a discussion of two-color lasers and coherent ...

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