Optical generation of terahertz and second-harmonic light in plasma-activated silicon nanophotonic structures

摘要

Plasma-activated silicon structures exhibit symmetry broken surfaces through chemical surface modification leading to a considerable second-order nonlinear optical response. This nonlinear response is demonstrated in second-harmonic and difference frequency generation measurements including the generation of terahertz radiation in silicon photonic nanowires using telecom wavelength excitation pulses.