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Design of a plasmonic-organic hybrid slot waveguide integrated with a bowtie-antenna for terahertz wave detection

机译：一种集成等离子体的等离子体 - 有机混合缝隙波导的设计   用于太赫兹波检测的蝴蝶结天线

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Electromagnetic (EM) wave detection over a large spectrum has recentlyattracted significant amount of attention. Traditional electronic EM wavesensors use large metallic probes which distort the field to be measured andalso have strict limitations on the detectable RF bandwidth. To address theseproblems, integrated photonic EM wave sensors have been developed to providehigh sensitivity and broad bandwidth. Previously we demonstrated a compact,broadband, and sensitive integrated photonic EM wave sensor, consisting of anorganic electro-optic (EO) polymer refilled silicon slot photonic crystalwaveguide (PCW) modulator integrated with a gold bowtie antenna, to detect theX band of the electromagnetic spectrum. However, due to the relative large RCconstant of the silicon PCW, such EM wave sensors can only work up to tens ofGHz. In this work, we present a detailed design and discussion of a newgeneration of EM wave sensors based on EO polymer refilled plasmonic slotwaveguides in conjunction with bowtie antennas to cover a wider electromagneticspectrum from 1 GHz up to 10THz, including the range of microwave, millimeterwave and even terahertz waves. This antenna-coupled plasmonic-organic hybrid(POH) structure is designed to provide an ultra-small RC constant, a largeoverlap between plasmonic mode and RF field, and strong electric fieldenhancement, as well as negligible field perturbation. A taper is designed tobridge silicon strip waveguide to plasmonic slot waveguide. Simulation resultsshow that our device can have an EM wave sensing ability up to 10 THz. To thebest of our knowledge, this is the first POH device for photonic terahertz wavedetection.
机译：大范围的电磁（EM）波检测最近吸引了大量关注。传统的电子EM波传感器使用大型金属探头，这些探头会扭曲待测场，并且对可检测的RF带宽也有严格的限制。为了解决这些问题，已经开发出集成的光子EM波传感器以提供高灵敏度和宽带宽。先前，我们展示了一种紧凑，宽带且灵敏的集成光子EM波传感器，该传感器由与金领结天线集成的有机电光（EO）聚合物填充的硅缝隙光子晶体波导（PCW）调制器组成，可检测电磁频谱的X波段。但是，由于硅PCW的RC常数相对较大，因此此类EM波传感器只能在数十GHz的频率下工作。在这项工作中，我们将对基于EO聚合物填充的等离子缝隙波导与领结天线相结合的新一代EM波传感器进行详细设计和讨论，以覆盖从1 GHz到10THz的更宽的电磁频谱，包括微波，毫米波和甚至太赫兹波。这种天线耦合的等离子-有机混合（POH）结构旨在提供超小的RC常数，等离子波模式与RF场之间的大重叠，强大的电场增强能力以及可忽略不计的场干扰。设计锥度以将硅条波导桥接到等离子缝隙波导。仿真结果表明，我们的设备可以具有高达10 THz的EM波感测能力。据我们所知，这是第一款用于光子太赫兹波检测的POH设备。

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