Minkovich Vladimir, Villatoro Joel, Monzón-Hernández David, Calixto Sergio, Sotsky Alexander, Sotskaya Ludmila
Opt Express. 2005 Sep 19;13(19):7609-14. doi: 10.1364/opex.13.007609.
The use of large-mode-area tapered holey fibers with collapsed air holes for refractive index sensing is demonstrated. The collapsing of the holes is achieved by tapering the fibers with a "slow-and-hot" method. This non adiabatic process makes the core mode to couple to multiple modes of the solid taper waist. Owing to the beating between the modes the transmission spectra of the tapered holey fibers exhibit several interference peaks. They shift remarkable to longer wavelengths as the external index increases. The multiple peaks, combined with a fitting algorithm, may allow high-accuracy refractometric measurements which can be used for diverse applications.
展示了使用具有塌陷气孔的大模场锥形多孔光纤进行折射率传感。通过“慢热”方法对光纤进行锥形拉伸来实现气孔的塌陷。这种非绝热过程使纤芯模式与固体锥形腰部的多个模式耦合。由于模式之间的拍频，锥形多孔光纤的传输光谱呈现出几个干涉峰。随着外部折射率的增加，它们显著地向更长波长移动。这些多个峰与拟合算法相结合，可能允许进行高精度的折射测量，可用于多种应用。
