Dr Ali Ali

—This paper proposes a novel Integrated Sensing and Communication (ISAC) metasurface designed to operate at 29.5 GHz. It leverages a Reflectarray Antenna (RA) capable of supporting dual functionalities—pencil beamforming for high-speed communication and Orbital Angular Momentum (OAM) beams for precise sensing. The communication aspect employs a pencil beam configuration to achieve high gain focused and directional transmission, while the OAM beam enables enhanced spatial resolution for sensing applications. Extensive simulations and lab measurements validate the superior performance of this single RA system, demonstrating improved gain and OAM beam purity metrics. This ISAC approach has the potential to reduce system complexity by 50% and energy consumption by 80% through a passive antenna design that facilitates both communication and sensing functionalities. Index Terms—6G, integrated sensing and communication, reflectarray antenna, orbital angular momentum.

This paper presents a novel on-chip hybrid plas-monic leaky-wave nanoantenna, enhanced by optical transverse periodic slots, designed for the standard telecommunications wavelength of 1550 nm. By leveraging the combined advantages of hybrid plasmonic waveguides and leaky-wave mechanisms, this nanoantenna achieves superior light confinement and highly directive radiation patterns. The multi-layer structure, featuring InGaAsP, gold, and quartz, ensures minimal propagation loss and efficient mode conversion from guided to radiative modes. Simulation results demonstrate the antenna's performance with a directivity of 18.5 dBi and a gain of 14.3 dBi, while maintaining a low side-lobe level and broad bandwidth. These characteristics make it highly suitable for integrated optical interconnects, beam-steering devices, and enhanced solar cells. The design is fully compatible with standard complementary metal-oxide-semiconductor (CMOS) processes, facilitating seamless integration into opto-electronic circuits. This advancement marks a significant step towards highly efficient, miniaturized optical communication systems and on-chip photonic applications.

—We introduce a novel topological valley photonic crystal antenna, designed on a silicon-on-insulator platform, operating at 193.5 THz with the efficiency of 80%. By lever-aging the unique properties of valley-polarized edge modes, this antenna achieves robust and efficient radiation, exceptional resilience to structural imperfections, and precise control over light propagation. The proposed design exemplifies high-performance capabilities, marking a significant leap forward in the integration of topological photonics. This breakthrough opens new horizons for next-generation optical communication systems, advanced sensing technologies, and other transformative photonic applications.

The proposed intelligent reflective surface (IRS) is presented to compensate for the path loss and enhance the coverage of 5G networks at mm-wave band. A(π) shaped element with variable-sized dipoles, distributed in a certain way to maintain a phase length curve over 340° in the range of 23-27 GHz, is addressed in this work. The proposed structure can be an ideal candidate for 5G mm-wave band n258.