Abstract

Directional emission of electromagnetic waves plays an essential role in laser radar and free-space communication. For most directional antennas, bandwidth and miniaturization are a pair of contradictions due to their underlying interference mechanism. Connection-type metamaterials exhibit exotic electromagnetic response near zero-frequency, which relies on the global topology of mesh connectivity rather than resonance and thus has a broad working bandwidth. In this Letter, we investigate the broadband orientation-dependent coupling effect of a 3D double mesh metamaterial. Based on this effect, we achieve a broadband directional emission (relative bandwidth of 37.72%) using a compact structure (compared to twice working wavelength). Our work provides a novel, to the best of our knowledge, scheme to manipulate a long-wavelength wave and may pave the way to a miniaturized directional antenna.

© 2024 Optica Publishing Group

Broadband tunable laser and infrared camouflage by wavelength-selective scattering metamaterial with radiative thermal management

Zichen Deng, Wenyuan Hu, Peng Zhou, Linqi Huang, Tao Wang, Xian Wang, and Rongzhou Gong
Opt. Lett. 49(4) 935-938 (2024)

Coherent perfect absorption from asymmetry transmissive Helmholtz resonator metamaterials

Wenbo Liu, Rui Yang, and Donghao Zhao
Opt. Lett. 49(6) 1552-1555 (2024)

Dissipative three-dimensional topological optical solitons with crossed localization of polarization components

Nikolay Veretenov, Sergey Fedorov, and Nikolay Rosanov
Opt. Lett. 49(7) 1761-1764 (2024)

Loading-effect-based three-dimensional microfabrication empowers on-chip Brillouin optomechanics

Peng Lei, Mingyu Xu, Yunhui Bai, Zhangyuan Chen, and Xiaopeng Xie
Opt. Lett. 49(6) 1465-1468 (2024)

Second-harmonic flat-top beam shaping via a three-dimensional nonlinear photonic crystal

Ruonan Wang, Qiang Cao, Xiaoliang Wang, Xiaoyu Tian, and Fengchang Li
Opt. Lett. 49(4) 1097-1100 (2024)