Li Jin-Hong, Chen Jin-Hui, Yan Shao-Cheng, Ruan Ya-Ping, Xu Fei, Lu Yan-Qing
Opt Lett. 2017 Sep 1;42(17):3395-3398. doi: 10.1364/OL.42.003395.
A planar, all-optical fiber polarizer-based device based on a hybrid plasmonic microfiber knot resonator (HPMKR) is demonstrated in this Letter. A microfiber knot resonator (MKR) can be flexibly attached to the gold film, which forms the hybrid plasmonic mode with high propagation loss. Therefore, the device can be used not only as a broadband polarizer, but also as a high-quality resonator by tuning the geometry of the MKR. The polarizer has an extinction ratio of more than 15 dB ranging from 1200 to 1600 nm, and the Q-factor is more than 52,000 for one polarization state. For a chosen polarization, the resonator has an extinction ratio of nearly 15 dB, even though the diameter of the microfiber is more than 5 μm, which is unattainable for a normal MKR. By further optimizing and packaging, the device can be utilized as a weight sensor, with a sensitivity of 18.28 pm/g (51.2 pm/kPa) for the cavity resonant wavelength. Further, a vibration sensor on a HPMKR structure for detecting vibration from tens of hertz to several kilohertz is demonstrated.
本文展示了一种基于混合等离子体微光纤结谐振器（HPMKR）的平面全光纤偏振器装置。微光纤结谐振器（MKR）可以灵活地附着在金膜上，形成具有高传播损耗的混合等离子体模式。因此，该装置不仅可以用作宽带偏振器，还可以通过调整MKR的几何形状用作高质量谐振器。该偏振器在1200至1600纳米范围内的消光比超过15分贝，对于一种偏振态，品质因数超过52000。对于选定的偏振，即使微光纤的直径超过5微米，谐振器的消光比也接近15分贝，这对于普通MKR来说是无法实现的。通过进一步优化和封装，该装置可以用作重量传感器，腔谐振波长的灵敏度为18.28皮米/克（51.2皮米/千帕）。此外，还展示了一种基于HPMKR结构的振动传感器，用于检测几十赫兹到几千赫兹的振动。
