Weiwei Li, Zilong Wang, and co-workers present a study on Brunel harmonic generation in thin-film organic semiconductors exposed to intense ultrashort laser excitation. The authors find that resonant transitions induced by low-energy photons can substantially change the nonlinear behavior of the materials manifesting as an early onset of non-perturbative harmonic generation. In the image the emitted harmonics from the organic semiconducting molecules are represented both as waves and particles.
