Generation of terahertz radiation by bulk and surface optical rectification from Generation of terahertz radiation by bulk and surface optical rectification from crystal planes of arbitrary orientation crystal planes of arbitrary orientation

Nanoporous honeycomb membranes on InP (111) surfaces emit ultrafast coherent terahertz pulses under near-infrared optical excitation. Irradiating the membranes with heavy noble gas Kr or Xe ions enhances the terahertz emission. The emission does not vary with in-plane magnetic field rotation and exhibits three-cycle dependence on azimuthal-angle rotation. Both suggest the terahertz source is not transient currents but optical rectification enhanced by the heavy-ion irradiation.

The role of optical rectification in the generation of terahertz radiation from The role of optical rectification in the generation of terahertz radiation from GaBiAs GaBiAs

Periodic density-functional theory is used to investigate the effect of cell contraction on the accuracy of simulated terahertz absorption spectra.

In a previous article, we presented a generalized expression for second-order bulk and third-order surfacefield-induced optical rectification for zincblende43m crystal faces with arbitrary Miller indices (hkl) along with experimental data for (11N )A and (11N )B GaAs in transmission geometry. We now expand the results to quasireflection geometry, with angles of incidence and detection of 45• . While this geometry introduces a p-polarized signal component due to mechanisms other than optical rectification, such as photocarrier acceleration by the surface depletion field, the azimuthal angle dependence of the optical rectification component yields further insight into the crystallographic orientation and surface properties of the sample.