A novel coupling device composed of a combination of microlens and pillar having an approximately $8~\mu \text{m}$ diameter and $20~\mu \text{m}$ height and grown from single-mode fiber (SMF) core end is proposed. This device was successfully fabricated by using a self-written waveguide and dipping method with UV-curable resin. Theoretical and experimental studies were done. A high coupling efficiency of more than −0.97dB was obtained for coupling to an ultrahigh numerical aperture (0.41) SMF with a spot diameter of $3.7~\mu \text{m}$ at a $1.55~\mu \text{m}$ wavelength in place of a silicon chip with an integrated spot-size converter. In contrast, it is only −4.0dB by a conventional SMF.

中文翻译：

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用于硅光子学的单模光纤芯柱上的聚合物微透镜

一种由微透镜和柱体组合而成的新型耦合装置，其具有大约 $8~\mu \text{m}$ 直径和 $20~\mu \text{m}$ 提出了从单模光纤 (SMF) 芯端生长的高度。该器件是通过使用自写波导和紫外线固化树脂浸渍方法成功制造的。进行了理论和实验研究。耦合到具有光斑直径的超高数值孔径 (0.41) SMF 时获得了超过 -0.97dB 的高耦合效率 $3.7~\mu \text{m}$ 在一个 $1.55~\mu \text{m}$ 用集成光斑尺寸转换器代替硅芯片。相比之下，传统 SMF 仅为 -4.0dB。