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arXiv 2102.04272physics.opticsphysics.app-ph
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高速等离子体电光束偏转器

High-speed plasmonic electro-optic beam deflectors

Martin Thomaschewski, Christian Wolff, Sergey I. Bozhevolnyi

摘要:

高度集成的有源纳米光子学解决了器件占用空间和操作速度的需求,是下一代光网络的关键技术。等离子体激元系统已被证明是缓解电光器件中的当前性能限制的有力竞争者。在这里,我们展示了一个等离子体光学相控阵列(OPA)组成的两个10- $μ$米长的等离子体移相器,用于控制两个亚波长分离的发射器的远场辐射模式的混叠自由波束转向与$\pm5^\circ$的角度范围和平坦的频率响应高达18 GHz(与1.2太赫兹的潜在带宽)。具有大的空间重叠的极端光场和静电场限制导致高相位调制效率($V_πL=0.24\: \text{Vcm}$)。使用等离子体激元锂酸盐技术进行光束操纵的演示方法提供了无惯性、鲁棒、超紧凑和高速的光束转向。

英文摘要:

Highly integrated active nanophotonics addressing both device footprint and operation speed demands is a key enabling technology for the next generation optical networks. Plasmonic systems have proven to be a serious contender to alleviate current performance limitations in electro-optic devices. Here, we demonstrate a plasmonic optical phased array (OPA) consisting of two 10-$μ$m-long plasmonic phase shifters, utilized to control the far-field radiation pattern of two subwavelength-separated emitters for aliasing-free beam steering with an angular range of $\pm5^\circ$ and flat frequency response up to 18 GHz (with the potential bandwidth of 1.2 THz). Extreme optical and electrostatic field confinement with great spatial overlap results in high phase modulation efficiency ($V_πL=0.24\: \text{Vcm}$). The demonstrated approach of using plasmonic lithium niobate technology for optical beam manipulation offers inertia-free, robust, ultra-compact and high-speed beam steering.

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