Experiments are described illustrating enhanced photon trapping and efficient energy transfer in mixed-dye planar solar concentrators containing, for example, Rhodamine 6G and Coumarin 6. These concentrators intercept more of the solar spectrum to give an enhanced photon-flux gain that exceeds the single-dye concentrator. It is also shown that the energy absorbed by the donor dye is transferred...

An experimental arrangement is described for determination of refractive indices n and extinction coefficients k of strongly absorbing liquids and solids over a wide spectral region. The reflectivity of parallel polarized light vs angle of incidence is measured, and the optical constants are calculated from the minimum parallel reflectivity and the corresponding Brewster angle. The accuracy of ...

A rhodamine 6G dye laser, internally pumped within the extended cavity of an Ar(+)-ion laser, is mode locked when its cavity length is matched to half that of the pump laser: the 5145-A argon laser line is passively mode locked by the combination of the saturable absorption and the lasing action of the dye, which is in turn synchronously pumped and mode locked. Tunable (5650-5950-A) ~10 psec pu...

The emission properties of a graded-index thermoplastic polymer optical fiber and a step-index thermosetting one, both doped with rhodamine 6G, have been studied. The work includes a detailed analysis of the amplified spontaneous emission together with a study of the optical gains and losses of the fibers. The photostability of the emission of both types of fibers has also been investigated. Co...

Treatments of tetrazolate salts prepared in situ from various aldehyde; malononitrile and sodium azide in the presence of NiO nanoparticles with benzyl bromide gave the corresponding 1,5- and 2,‌5-disubstituted tetrazoles. Reaction of tetrazolate salts with 2,4′-dibromoacetophenone in the presence of NiO nanoparticles provided the corresponding 2,5-disubstituted derivatives as an only isomer. T...

The future sixth-generation (6G) wireless network has advantages of global coverage, high spectrum efficiency, low cost, safety, and higher intelligent level. 6G technology can create ubiquitous mobile networks for human society. Terahertz communication the characteristics data transmission rate, delay, anti-interference, which may be widely used in technology. This paper mainly introduces plan...

Full-spectrum ranging from sub-6 GHz to THz and visible light will be exploited in 6G order reach unprecedented key-performance-indicators. However, an extraordinary amount of energy consumed by network infrastructure, while functions massively deployed Internet Everything (IoE) devices are limited embedded batteries. Therefore, self-sustainable (ESS) is proposed this article. First all, it may...

Sixth-generation (6G) wireless communications and networks will continue to move higher frequency wider bandwidth, with much data rate spectral efficiency. Given the heterogeneity densification of Internet Things (IoT), 6G network may need be extended modern random access (RA) for IoT applications, which can achieved via smart protocol design advanced signal processing technologies. The RA tech...

While fifth-generation (5G) communications are being rolled out around the world, sixth-generation (6G) have attracted much attention from both industry and academia. Compared with 5G, 6G will a wider frequency band, higher transmission rate, spectrum efficiency, greater connection capacity, shorter delay, coverage stronger anti-interference capability, so as to meet various network requirement...