Xue Jianrong, Li Shuguang, Xiao Yuzhe, Qin Wei, Xin Xujun, Zhu Xingping
Key Laboratory of Metastable Materials Science and Technology, College of Science, Yanshan University, Qinhuangdao 066004, China.
Opt Express. 2013 Jun 3;21(11):13733-40. doi: 10.1364/OE.21.013733.
The polarization filter characters of a gold-coated and liquid-filled photonic crystal fiber are studied using the finite element method. Results show that the resonance strength and wavelengths are different in two polarized directions. Filling liquid of refractive index n=1.33 (purified water) in holes in longitudinal direction can increase the loss of core mode polarized in the y-direction around the resonance peak. The resonance strength is much stronger in y-polarized direction than in x-polarized direction. The resonance strength can achieve 508dB/cm in y-polarized direction at the communication wavelength of 1311nm in one of our structures. Moreover, the full width half maximum is only 20nm. Such a small number makes such photonic crystal fibers promising candidate to filter devices. A liquid filled PCF of the small hole in the fiber core is designed and we find that filling liquid increases the resonance strength peak by thirty eight percent for the y-polarized resonance point.
采用有限元方法研究了涂金填充液体光子晶体光纤的偏振滤波特性。结果表明，两个偏振方向上的共振强度和波长不同。沿纵向孔中填充折射率n = 1.33的液体（纯净水）会增加共振峰附近y方向偏振的纤芯模式损耗。y偏振方向的共振强度比x偏振方向强得多。在我们的一种结构中，在1311nm通信波长下，y偏振方向的共振强度可达508dB/cm。此外，半高宽仅为20nm。如此小的数值使得这种光子晶体光纤有望成为滤波器件的候选者。设计了一种纤芯有小孔的填充液体光子晶体光纤，我们发现对于y偏振共振点，填充液体使共振强度峰值增加了38%。
