Giant Asymmetric Radiation from an Ultrathin Bianisotropic Metamaterial
arXiv:1803.07903 · doi:10.1002/advs.201700922
Abstract
Unidirectional radiation is of particular interest in high-power lasing and optics. Commonly, however, it is difficult to achieve a unidirectional profile in such a system without breaking reciprocity. Recently, assisted by metamaterials without structural symmetry, antennas that radiate asymmetrically have been developed, hence providing the possibility of achieving unidirectionality. Nevertheless, it has been challenging to achieve extremely high radiation asymmetry in such antennas. Here, we demonstrate that this radiation asymmetry is further enhanced when magnetic plasmons are present in the metamaterials. Experimentally, we show that a thin metamaterial with a thickness of approximately λ_0/8 can exhibit a forward-to-backward emission asymmetry of up to 1:32 without any optimization. Our work paves the way for manipulating asymmetric radiation by means of metamaterials and may have a variety of promising applications, such as directional optical and quantum emitters, lasers, and absorbers.
arXiv comment22pages, 5figures, Journal Article
References in corpus (9)
- A Perfect Metamaterial Absorber
- Dielectric Metasurfaces for Complete Control of Phase and Polarization with Subwavelength Spatial Resolution and High Transmission
- Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
- Aberration-free ultra-thin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces
- Electromagnetic wave analogue of electronic diode
- Ultrathin metasurface with topological transition for manipulating spoof surface plasmon polaritons
- Perfect Single-Sided Radiation and Absorption without Mirrors
- Perfect interference-less absorption at infrared frequencies by a van der Waal's crystal
- Huge local field enhancement in perfect plasmonic absorbers