Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Droulias, Sotiris"'
Future wireless connectivity is envisioned to accommodate functionalities far beyond broadband data transmission over point-to-point direct links, enabling novel scenarios, such as communication behind blockers and around corners, and innovative conc
Externí odkaz:
http://arxiv.org/abs/2410.08099
Localization is expected to play a significant role in future wireless networks as positioning and situational awareness, navigation and tracking, are integral parts of 6G usage scenarios. Nevertheless, in many cases localization requires extra equip
Externí odkaz:
http://arxiv.org/abs/2410.00534
Spatial division multiple access (SDMA), a powerful method routinely applied in multi-user multiple-input multiple-output (MIMO) communications, relies on the angular orthogonality of beams in the far field, to distinguish multiple users at different
Externí odkaz:
http://arxiv.org/abs/2408.13190
The design of Reconfigurable Intelligent Surfaces (RISs) is typically based on treating the RIS as an infinitely large surface that steers incident plane waves toward the desired direction. In practical implementations, however, the RIS has finite si
Externí odkaz:
http://arxiv.org/abs/2408.12205
Autor:
Droulias, Sotiris, Loulakis, Michalis, Papazoglou, Dimitris G., Tzortzakis, Stelios, Chen, Zhigang, Efremidis, Nikolaos K.
We recently introduced a new class of optical beams with a Bessel-like transverse profile and increasing beam width during propagation, akin to an "inverted pin". Owing to their specially engineered distribution, these beams have shown remarkable per
Externí odkaz:
http://arxiv.org/abs/2408.02659
Wireless communications are nowadays shifting to higher operation frequencies with the aim to meet the ever-increasing demand for bandwidth. While reconfigurable intelligent surfaces (RISs) are usually envisioned to restore the line-of-sight of block
Externí odkaz:
http://arxiv.org/abs/2312.01009
Autor:
Droulias, Sotiris, Loulakis, Michalis, Papazoglou, Dimitris G., Tzortzakis, Stelios, Chen, Zhigang, Efremidis, Nikolaos K.
We introduce a new class of optical beams, which feature a spatial profile akin to an ``inverted pin''. In particular, we asymptotically find that close to the axis the transverse amplitude profile of such beams takes the form of a Bessel function wi
Externí odkaz:
http://arxiv.org/abs/2310.01543
The terahertz (THz) frequency band has recently attracted considerable attention in wireless communications as potential candidate for providing the necessary high bandwidth for demanding applications. With increasing frequency, however, the communic
Externí odkaz:
http://arxiv.org/abs/2212.05770
Autor:
Stamatopoulou, P. Elli, Droulias, Sotiris, Acuna, Guillermo P., Mortensen, N. Asger, Tserkezis, Christos
Publikováno v:
Nanoscale 14, 17581 (2022)
We introduce and theoretically analyze the concept of manipulating optical chirality via strong coupling of the optical modes of chiral nanostructures with excitonic transitions in molecular layers or semiconductors. With chirality being omnipresent
Externí odkaz:
http://arxiv.org/abs/2211.08034
Autor:
Droulias, Sotiris, Alexiou, Angeliki
A Reconfigurable Intelligent Surface (RIS) redirects and possibly modifies the properties of incident waves, with the aim to restore non-line-of-sight communication links. Composed of elementary scatterers, the RIS has been so far treated as a collec
Externí odkaz:
http://arxiv.org/abs/2205.08819