Between microwaves and infrared light lies the terahertz gap—a once-impervious frontier. This episode explains how continuous-wave photomixing uses two lasers to generate and detect THz waves directly from light, achieving room-temperature operation and ultra-clean signals. We explore exciting applications: terahertz fingerprinting for sensing, nondestructive testing in industry, and the race toward terabit-per-second wireless with ISAC and photonic integrated circuits. We also cover the physics hurdles—path loss and line-of-sight—and what comes next as chips shrink the lab into a single chip. This episode is sponsored by Ember Silk.

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Sponsored by Embersilk LLC