Toroidal multipole is a special current distribution that has many different characteristics from electric multipole and magnetic multipole distributions. Because of its special properties, the toroidal dipole is a research hotspot in the field of metamaterials and nanophotonics. However, the low scattering of the toroidal dipole moment makes its excitation a challenging task. At present, there are relatively few studies on its specific engineering applications. In this paper, by slotting in the rectangular cavity, the excitation of an equivalent toroidal dipole is successfully achieved over a wide frequency range of 53–58 GHz. Results indicate that under the action of the toroidal dipole, the TE10 mode electromagnetic waves transmitted in the rectangular waveguide are converted into vector beams and are radiated outwards. Further adjusting the spatial distribution of the magnetic dipoles in the toroidal dipoles yields results that indicate that the resonance mode in the slot is still dominated by the magnetic toroidal dipole moment, and the electromagnetic waves radiating outward are vortex beams carrying vector polarization. The scattered energy of each dipole moment inside the antenna is calculated. This calculation verifies that the mass of the vector beam and vector vortex beam is closely related to the toroidal dipole supported by this antenna. The proposed structure can be applied to explorations in vortex filtering, in photon entanglement, and in the photonic spin Hall effect.

设计了一种基于石墨烯的新型可调谐宽带超材料吸收器。该吸收器采用经典夹层结构，包含一个图案化的单层石墨烯超表面、介电层和金属底板。该石墨烯图案的结构由不同尺寸的石墨烯谐振器组成，确保高吸收率的同时能拓宽吸收带宽。研究结果表明，当费米能级Ef为0.9 eV时，吸收器在光源垂直入射条件下能实现2.3~5.2 THz波段90%以上的宽带吸收率，同时通过控制石墨烯的费米能级可以灵活调节吸收器的带宽和吸收性能。此外，基于单元结构的对称设计，吸收器对偏振角度的变化并不敏感，所设计的吸收器结构将促进石墨烯材料在太赫兹波段和新型吸波器件中的广泛应用。

为了提高传统可见光定位算法的定位精度，提出一种基于区域划分的新型自适应可见光定位算法。在对单光源和多光源定位算法的研究基础上，设计基于对称结构接收机的两光源定位算法来弥补边缘区域的定位误差。依据上述三种算法在不同区域的定位误差分布特性，构建公平性函数，并结合朗伯辐射模型，将定位区域划分为多个子区域。在定位阶段，先根据接收信号特征粗略判断接收机所处区域，实现粗定位，再自适应选择性能更优的定位算法实现精准定位。仿真结果表明，在5 m×5 m×3 m的室内环境下，算法的平均定位误差约为2.5 cm，相比单光源、两光源和多光源定位算法分别改善了46%，24%，55%。在室内1.5 m×1.5 m×2 m的环境下搭建可见光定位系统平台并测试算法性能，结果表明，提出的算法在较低的复杂度代价下能够明显改进定位精度。