5 papers
Non-Diffracting Beams for Near-Field Millimeter-Wave Communications: Advantage Regimes Under Aperture and Blockage Constraints
Yifeng Qin, Jing Chen, Zhi Hao Jiang +2
Near-field blockage changes the beam-design objective in millimeter-wave links: maximizing the unblocked on-axis gain does not necessarily maximize blocked-link performance. This p…
Pearcey-Inspired Quartic Wavefront Shaping for Obstructed Near-Field Multi-User Communications
Yifeng Qin, Jing Chen, Zhi Hao Jiang
Radiative near-field (RNF) beamforming is vulnerable to blockages that disrupt Fresnel zones. This letter proposes an obstruction-unaware wavefront shaping strategy inspired by cat…
Accelerating Inverse Design of Optical Metasurfaces: Analytic Gradients of Periodic Green's Functions via Quasi-Modular Forms
Mingcan Qin, Yifeng Qin
The inverse design of nonlocal metasurfaces requires the precise optimization of lattice geometry to engineer spatial dispersion and high-Q resonances. However, gradient-based opti…
Airy Beamforming for Radiative Near-Field MU-XL-MIMO: Overcoming Half-Space Blockage
Yifeng Qin, Jing Chen, Zhi Hao Jiang +3
The move to next-generation wireless communications with extremely large-scale antenna arrays (ELAAs) brings the communications into the radiative near-field (RNF) region, where di…
Non-trivial Bifocal and Optical Vortex Generation of DNG Materials Unveiled by Generalized Transfer Matrix Method and Matrix Fourier Optics
Yifeng Qin
The investigation and analysis of exotic physical phenomena facilitated by metamaterials have emerged as a compelling area of interest in physics, material science, and engineering…