Large-Angle, Multifunctional Metagratings Based on Freeform Multimode Geometries,Nano Letters

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Large-Angle, Multifunctional Metagratings Based on Freeform Multimode Geometries
Nano Letters ( IF 9.6 ) Pub Date : 2017-05-01 00:00:00 , DOI: 10.1021/acs.nanolett.7b01082
David Sell ₁ , Jianji Yang ₁ , Sage Doshay ₁ , Rui Yang ₁ , Jonathan A. Fan ₁

Affiliation

We show that silicon-based metagratings capable of large-angle, multifunctional performance can be realized using inverse freeform design. These devices consist of nonintuitive nanoscale patterns and support a large number of spatially overlapping optical modes per unit area. The quantity of modes, in combination with their optimized responses, provides the degrees of freedom required to produce high-efficiency devices. To demonstrate the power and versatility of our approach, we fabricate metagratings that can efficiently deflect light to 75° angles and multifunctional devices that can steer beams to different diffraction orders based on wavelength. A theoretical analysis of the Bloch modes supported by these devices elucidates the spatial mode profiles and coupling dynamics that make high-performance beam deflection possible. This approach represents a new paradigm in nano-optical mode engineering and utilizes different physics from the current state-of-the-art, which is based on the stitching of noninteracting waveguide structures. We envision that inverse design will enable new classes of high-performance photonic systems and new strategies toward the nanoscale control of light fields.

中文翻译：

基于自由形式多模几何的大角度，多功能元光栅

我们证明了使用逆自由形式设计可以实现具有大角度，多功能性能的硅基光栅。这些设备由非直观的纳米级图案组成，并且每单位面积支持大量空间重叠的光学模式。模式的数量以及它们的优化响应，提供了生产高效设备所需的自由度。为了证明我们的方法的强大功能和多功能性，我们制造了可以有效地将光偏转到75°角的偏光镜，以及可以根据波长将光束转向不同衍射级的多功能设备。这些设备支持的Bloch模的理论分析阐明了空间模轮廓和耦合动力学特性，这些特性使高性能的光束偏转成为可能。这种方法代表了纳米光学模式工程学的新范例，并利用了与当前技术不同的物理学，该技术基于非相互作用波导结构的缝合。我们设想逆设计将使新型的高性能光子系统和朝着光场的纳米级控制的新策略成为可能。

更新日期：2017-05-04

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