Stimulated terahertz emission from group-V donors in silicon under intracenter photoexcitation

Stimulated terahertz stokes emission of silicon crystals doped with antimony donors.

Stimulated Stokes emission has been observed from silicon crystals doped by antimony donors when optically excited by radiation from a tunable infrared free electron laser. The photon energy of the emission is equal to the pump photon energy reduced by the energy of the intervalley transverse acoustic (TA) g phonon in silicon (approximately 2.92 THz). The emission frequency covers the range of ...

Terahertz Stimulated Emission from Silicon Doped by Hydrogenlike Acceptors

Spatio-spectral characteristics of ultra-broadband THz emission from two-colour photoexcited gas plasmas and their impact for nonlinear spectroscopy

We present a characterization of the combined spatial and spectral properties of the terahertz (THz) and mid-infrared emission from gas plasmas generated and driven by two-colour femtosecond optical pulses. For its use in nonlinear spectroscopy, the impact of the relatively complex spatial profile for both broadband (∼10 THz) and ultra-broadband (>100 THz) emission needs to be considered, in pa...

Advanced THz laser performance of shallow donors in axially stressed silicon crystal

Hybrid three-dimensional dual- and broadband optically tunable terahertz metamaterials

The optically tunable properties of the hybrid three-dimensional (3D) metamaterials with dual- and broadband response frequencies are theoretically investigated in the terahertz spectrum. The planar double-split-ring resonators (DSRRs) and the standup double-split-ring resonators are fabricated on a sapphire substrate, forming a 3D array structures. The bi-anisotropy of the hybrid 3D metamateri...