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Hyperbolic Meta-Antennas Enable Full Control of Scattering and Absorption of Light

机译：双曲线元天线可以完全控制光的散射和吸收

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摘要

We introduce a novel concept of hybrid metal-dielectric meta-antenna supporting type II hyperbolic dispersion, which enables full control of absorption and scattering of light in the visible/near-infrared spectral range. This ability lies in the different nature of the localized hyperbolic Bloch-like modes excited within the meta-antenna. The experimental evidence is corroborated by a comprehensive theoretical study. In particular, we demonstrate that two main modes, one radiative and one non-radiative, can be excited by direct coupling with the free-space radiation. We show that the scattering is the dominating electromagnetic decay channel, when an electric dipolar mode is induced in the system, whereas a strong absorption process occurs when a magnetic dipole is excited. Also, by varying the geometry of the system, the relative ratio of scattering and absorption, as well as their relative enhancement and/or quenching, can be tuned at will over a broad spectral range, thus enabling full control of the two channels. Importantly, both radiative and nonradiative modes supported by our architecture can be excited directly with far field radiation. This is observed to occur even when the radiative channels (scattering) are almost totally suppressed, thereby making the proposed architecture suitable for practical applications. Finally, the hyperbolic meta-antennas possess both angular and polarization independent structural integrity, unlocking promising applications as hybrid meta-surfaces or as solvable nanostructures.
机译：我们介绍了一种混合金属介质元天线的新颖概念，支持II型双曲分散体，其能够完全控制可见/近红外光谱范围内光的吸收和散射。这种能力在于在元天线内激发的局部双曲线形式的不同性质。实验证据是通过综合理论研究证实的。特别地，我们证明了两个主要模式，一个辐射和一个非辐射，可以通过与自由空间辐射直接耦合来激发。我们表明，当在系统中诱导电偶极模式时，散射是主导的电磁衰减通道，而当磁性偶极子被激发时，发生强的吸收过程。而且，通过改变系统的几何形状，可以在宽频谱范围内调谐散射和吸收和吸收和吸收和/或淬火的相对比，从而能够完全控制两个通道。重要的是，我们的架构支持的辐射和非辐射模式都可以直接与远场辐射直接兴奋。即使当几乎完全抑制辐射通道（散射）时，也观察到这一点，从而使得建议的建筑适用于实际应用。最后，双曲线元天线具有角度和极化独立的结构完整性，将有前途的应用解锁为杂化元表面或可溶性纳米结构。

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