The 35-fs-long pulses of a commercial Ti:sapphire amplifier are compressed to ∼ 20 f mathvariant="normal">s via self-phase modulation ...

The results of studying the generation terahertz (THz) radiation in p-n-heterostructures based on a-Si:H//c-Si upon their photoexcitation by from a femtosecond titanium-sapphire laser with wavelength 800 nm are presented. properties observed THz can be explained excitation fast photocurrent nonequilibrium charge carriers created region potential barrier under interband structure. photocurrent, ...

increasing water distribution uniformity in micro irrigation systems has been an important subject in applied researches. despite considerable progress in emitters’ construction, some research reports refer to their incapability in water distribution uniformity. in order to achieve greater uniformity in micro irrigation, it is necessary to manufacture emitters with low variation in manufacturin...

In the last years, the Terahertz (THz) domain has attracted an increasing interest in the scientific community due to the large number of applications that have been identified (Tanouchi, 2007). Even if many different Terahertz sources like photomixers, quantum cascade lasers, and photoconductive antennas (Mittleman, 2003) have been investigated in the past, the fabrication of a compact device ...

We have built a relatively simple, highly efficient, terahertz (THz) emission and detection system centred around a 15 fs Ti:sapphire laser. In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs crystal, kept at a temperature near 300 K, biased with a 50 kHz, +/- 400 V square wave. Using rapid de...

The use of beam interference in combination with a large-area photoconductive emitter for the generation of pulsed terahertz (THz) radiation is presented. An interference pattern with a period twice that of the THz emitter is generated with a transmission phase grating, placed directly in front of the photoconductive emitter. This way, efficient THz generation is achieved with a single metallis...

The lithium niobate (LiNbO 3 ) metasurface is an attractive platform for nonlinear frequency conversion due to its excellent nonlinearity, high damage threshold, and strong enhancement of the driving field. Here, we demonstrated terahertz (THz) generation from LiNbO on insulator. THz electric field 300 nm thickness enhanced by more than one order magnitude compared unstructured sample. very sel...

Polarization control of THz light is paramount interest for the numerous applications offered in this frequency range. Recent developments spintronic emitters allow a very efficient broadband emission, and especially unique their ability polarization switching through magnetization ferromagnetic layer. Here we present an improved scheme to achieve full 360{\deg} nearly coherent rotation that do...