Mechanisms of THz generation from silver nanoparticle and nanohole arrays
| Abstract | We study THz pulses generated from plasmonic metal nanostructures underfemtosecond illumination of near-IR light.We find two regimes ofexcitation, according to the order of the dependence of the THz fluenceon the incident near-IR intensity: less then second order at lowintensities, changing to approximately fourth order for higherintensities. These regimes are most likely associated with two THzgeneration mechanisms: optical rectification, and the ponderomotiveacceleration of ejected electrons. These data provide evidence that bothmechanisms can be at work in the same experiment. |
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| URL | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.125426 |
| Authors | D. K. Polyushkin, I. Marton, P. Racz, P. Dombi, E. Hendry, W. L. Barnes |
| Year of publication | 2014 |
| Date published | 03/2014 |
| Journal | Phys. Rev. B |
| Volume | 89 |
| Pages | 125426: 1-7 |
| Keywords | excitation, optical rectification, plasmonic metal nanostructures, ponderomotive, THz generation |