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A fourfold-azimuthal dependence of terahertz radiation from polished mono-crystalline (100) silicon is observed firstly. This phenomenon is explained by the electric quadrupole-magnetic dipole, which resemble second harmonic generation from (100) silicon.
Electro-optic effects of PbZr0.52Ti0.48O3(PZT) and BaTiO3(BTO) ferroelectric thin films in the terahertz frequency range are studied with high-sensitive terahertz time-domain spectroscopy (THz-TDS). A linear response of PZT film with the linear electro-optic coefficient rc=6.73×10–11 m/V, and a quadratic response of BTO film with the second-order electro-optic coefficient Rc=1.42×10–17 m2/V2, are...
Many production peer-to-peer (P2P) streaming systems use content delivery networks (CDN) to protect the user’s quality of experiences. Thus, how to efficiently utilize the capacity of CDN (e.g., which peers receive services from the CDN nodes) is a problem of practical significance. Existing solutions adopt a passive, on-demand approach, which is inefficient in utilizing CDN resources. In this paper,...
Fundamental and high-order phonon-phonon interactions dominate the far infrared absorption and dispersion spectrum of most semiconductors and dielectrics. We present the detailed investigation of the temperature dependence of the dielectric function of the semiconductor GaSe in the frequency range below 4 THz, between 100 K and 310 K, using terahertz time-domain spectroscopy (THz-TDS) technique. Combined...
Firstly, based on the analysis of hard problems of resource model in the CDN and computational grid, the paper gives a novel resource management model, VO-enabled compound resource tree model-VO-CRTM model, to organize resource and manage all kinds of resources in the content delivery environment. VO-CRTM organizes resource to form hierarchical tree architecture in lengthways according to native communication...
This paper presents the refractive index, absorption coefficient of layered GaSe crystal by means of terahertz time-domain spectroscopy. A unique resonance peak was observed at 0.59 THz (19.6 cm-1 ), which attributes to the E' phonon mode of epsiv-GaSe.
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