We mathematically account for the temporal response of the system, reduce noise with a lock-in free carrier-wave modulation and realize quick, noise-robust image undersampling. A laser diode with a digital micromirror device shining visible light onto silicon acts as the spatial THz modulator. Here, by optimizing the modulation geometry and post-processing algorithms, we demonstrate the acquisition of a THz-video (32 × 32 pixels at 6 frames-per-second), shown in real-time, using a single-pixel fiber-coupled photoconductive THz detector. Single-pixel cameras have emerged as alternatives to multi-pixel cameras due to reduced costs and superior durability. However, commercialization is prevented by impractical and expensive THz instrumentation. Terahertz (THz) radiation is poised to have an essential role in many imaging applications, from industrial inspections to medical diagnosis.
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