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Numerical and experimental investigation of long-period gratings in photonic crystal fiber for refractive index sensing of gas media

机译:光子晶体光纤中长周期光栅对气体介质折射率的数值和实验研究

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摘要

We have used the finite-difference frequency-domain (FDFD) method to simulate the core mode to cladding mode couplings in long-period gratings (LPGs) in photonic crystal fiber (PCF). Four sets of LPG-PCF have been fabricated with respective periodicities of 590, 540, 515, and 490 (mu)m, resulting in corresponding resonance wavelengths (RWs) of 1241, 1399, 1494, and 1579 nm. We show both theoretically and experimentally that the longer the RW, the more sensitive the LPG-PCF is to the index change in Ar. We demonstrate a robust sensitivity of 517 nm per refractive index unit using the LPG-PCF at 1579 nm RW.
机译:我们已经使用了有限差分频域(FDFD)方法来模拟光子晶体光纤(PCF)中长周期光栅(LPG)中的核心模式到包层模式耦合。已经制造了四组LPG-PCF,其各自的周期分别为590、540、515和490μm,从而产生了1241、1399、1494和1579 nm的相应谐振波长(RW)。我们在理论和实验上都表明,RW越长,LPG-PCF对Ar的指数变化越敏感。我们展示了使用LPG-PCF在1579 nm RW处每折射率单位517 nm的鲁棒灵敏度。

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