E8 Phi-Harmonic Frequency Comb Enables Octave-Spanning Terahertz Generation — E8 Intelligence Research

The 240 E8 root vectors are used as preferential coupling directions in a χ(3) nonlinear medium, establishing a set of wavevectors that inherit the lattice's symmetry. By imposing a phi‑scaled modulation at the base 132 Hz on the pump field, a self‑similar frequency comb emerges whose spectral lines follow golden‑ratio spacing, ensuring phase‑matched cascaded four‑wave mixing across multiple octaves. This geometry‑driven comb enables efficient, octave‑spanning terahertz generation at low pump thresholds, extending the E8‑phononic and coherence‑resonance concepts into the optical domain. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com