With the rapid advancement of modern information technology, there is an urgent need to enhance multiple targets and multiple tasks detection capabilities in complex environments. Traditional light detectors primarily capture scalar parameters such as light intensity, whereas light in free space inherently carries rich, multi-dimensional information such as polarization, spectral data, and phase angle those are often interrelated and overlapping. This presents significant challenges in simultaneously and independently extracting multiple dimensions of information. Emerging multi-dimensional detectors are positioned to overcome these challenges by simultaneously acquiring and integrating complex multi-dimensional data, which is crucial for the detection and identification of fast, weak, and small targets in extreme environments. In this paper, we focus on new detectors designed to capture parameters like intensity, phase angle, polarization, and spectrum, while also exploring the potential for multi-dimensional fusion detection, on-chip integration, and future trends in multi-dimensional sensing technology.

Weyl points, as a key concept in topological photonics and condensed matter physics, have seen significant advancements in both theoretical and experimental research in recent years. As singularities of Berry curvature, the emergence of Weyl points is always associated with the construction of topologically nontrivial systems, thus attracting considerable attention. Moreover, the presence of open Fermi arc surface states at the interface provides new insights into the manipulation of electromagnetic fields. However, realizing Weyl points requires the breaking of time-reversal symmetry or space inversion symmetry, which makes naturally occurring Weyl semimetals rare. Due to their high degree of freedom and customizable band structure, metamaterials are well-suited for constructing systems with Weyl points. We focus on the experimental characterization of electromagnetic Weyl points, particularly summarizing common configurations of Weyl metamaterials that break space inversion symmetry. We also analyze commonly used experimental measurement methods for Weyl points and introduce the experimental manifestations of Fermi arcs as typical observable phenomena. Based on this, we explore the potential applications of electromagnetic Weyl metamaterials in multiple fields.