It has been used to study the interaction of harmonics by nonlinear resonance.
2.
A study published in 2010 and conducted by Boian S . Alexandrov and colleagues at the Center for Nonlinear Studies at Los Alamos National Laboratory in New Mexico created mathematical models predicting how terahertz radiation would interact with double-stranded DNA, showing that, even though involved forces seem to be tiny, nonlinear resonances ( although much less likely to form than less-powerful common resonances ) could allow terahertz waves to " unzip double-stranded DNA, creating bubbles in the double strand that could significantly interfere with processes such as gene expression and DNA replication ".