The direct interfacing of photonic crystal fiber to a metallic nanoantenna has widespread application in nanoscale imaging, optical lithography, nanoscale lasers, quantum communication, in vivo sensing, and medical surgery. We report on the fabrication of a needle-shaped plasmonic nanoantenna on the end facet of a photonic crystal fiber using electron-beam-induced evaporation of platinum. We demonstrate the coupling of light from the fiber waveguide mode to the subwavelength nanoantenna plasmonic mode focusing down to the apex of the plasmonic needle using a polarization-resolved far-field side-scatter imaging technique. Our work provides an important step toward widespread application of optical fibers in nearfield spectroscopic techniques such as tip-enhanced Raman and fluorescence microscopy, single-photon excitation and quantum sensors, nanoscale optical lithography, and lab-on-fiber devices.

中文翻译：

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光子晶体光纤与金属纳米天线的接口以增强光纳米聚焦

光子晶体光纤与金属纳米天线的直接接口已广泛应用于纳米级成像，光刻，纳米级激光，量子通信，体内感应和医学手术。我们报告使用电子束诱导的铂蒸发在光子晶体光纤的端面上制作针状等离子体纳米天线。我们演示了使用偏振分辨远场侧向散射成像技术将光从光纤波导模式耦合到亚波长纳米天线等离激元模式，聚焦到等离激元针的顶点。我们的工作为光纤在近场光谱技术中的广泛应用迈出了重要的一步，例如尖端拉曼光谱和荧光显微镜，单光子激发和量子传感器，纳米级光学光刻以及光纤实验室设备。