Generation of THz radiation in semiconductors with cyclotron heating of heavy holes

Abstract

A method of THz radiation generation in semiconductors in crossed static magnetic and alternating electric fields is considered. It is based on the inversion of the transition between heavy-and light-hole sub-bands in the THz spectral range. This inversion is created due to cyclotron frequencies of heavy and light holes being different. Under sufficiently low hole density when the hole-hole energy exchange is less efficient than the hole-lattice one, this fact leads to a situation when the resonant with heavy holes pump alternating electric field heats only the heavyhole population thereby inverting the heavy-light holes transition in a narrow spectral range. The optimal parameters of such a scheme were found and it was shown that it can operate even at room temperature (in the pulsed mode).

Effect of cross-focusing of two laser beams on THz radiation in graphite nanoparticles with density ripple

“…THz radiation sources have extensive applications in the field of remote sensing, short distance wireless communications, biological and chemical imaging, non destructive testing, high field condensed-matter studies and explosives detections etc [4][5][6][7]. A variety of schemes have been proposed to produce THz radiations [8][9][10]. As we know, plasma is capable of dealing with the high power laser and of generation of THz radiation with a high electric field without any physical damage to the medium.…”

THz radiation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma

“…Typically, 0.1-10 THz is referred as THz region but the region is extending up to 40-50 THz (Wang, 2001). A number of schemes have been employed to produce THz radiation (Hafizi et al, 1992;Hashimshony et al, 1999;Muggli et al, 1998;Leemans et al, 2004;Sheng et al, 2005;Alekseev et al, 2006;Ma et al, 2006;Kukushkin, 2008). Currently, the powerful sources of THz radiation are large accelerator-based sources and the lack of compact high-power sources limits the exploitation of full potential of THz radiation.…”

Studies of Terahertz Sources and Their Applications

“…Yampolsky and Frainman [57] reported the four-wave coupling scheme in a plasma filled capillary for the amplification of terahertz radiation. Kukushkin has produced the THz radiations in semiconductors using crossed alternating electric field and static magnetic field [58]. The external dc magnetic field used to increase the field of emitted radiations [59].…”