Plasmonic materials, when properly illuminated with visible or near-infrared wavelengths, exhibit unique and interesting features that can be exploited for tailoring and tuning the light radiation and propagation properties at nanoscale dimensions. A variety of plasmonic heterostructures have been demonstrated for optical-signal filtering, transmission, detection, transportation, and modulation. In this review, state-of-the-art plasmonic structures used for telecommunications applications are summarized. In doing so, we discuss their distinctive roles on multiple approaches including beam steering, guiding, filtering, modulation, switching, and detection, which are all of prime importance for the development of the sixth generation (6G) cellular networks.

The Raman spectra of pure silica core fibres revealed the presence of molecular oxygen, which may be responsible for two absorption bands, one at 0.76 and the other at 1.27 Fm.There has been a renewal of interest in pure silica core fibres owing to their inherently low losses and dispersion between 1.2 and 1.6 pm. In this region, the main cause of attenuation is the presence of the OH absorption bands. A recent study of the loss spectrum of pure and fluorine-doped silica fibres of low OH content by Heitmann et aL' revealed the existence of a new absorption band at 1.273 pm, which always appears associated with another one located around 0.765 pm. They tentatively assigned these bands to the presence of crystallites in the silica matrix which could not be detected by x-ray analysis. We present here new evidence, from a Raman analysis of fibres, that suggests a different origin for these absorption bands.

All-dielectric nanophotonic devices are promising candidates for future lossless (bio)sensing and telecommunications applications.

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