Villatoro Joel, Kreuzer Mark P, Jha Rajan, Minkovich Vladimir P, Finazzi Vittoria, Badenes Gonçal, Pruneri Valerio
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Barcelona, Spain.
Opt Express. 2009 Feb 2;17(3):1447-53. doi: 10.1364/oe.17.001447.
We report an in-reflection photonic crystal fiber (PCF) interferometer which exhibits high sensitivity to different volatile organic compounds (VOCs), without the need of any permeable material. The interferometer is compact, robust, and consists of a stub of PCF spliced to standard optical fiber. In the splice the voids of the PCF are fully collapsed, thus allowing the excitation and recombination of two core modes. The device reflection spectrum exhibits sinusoidal interference pattern which shifts differently when the voids of the PCF are infiltrated with VOC molecules. The volume of voids responsible for the shift is less than 600 picoliters whereas the detectable levels are in the nanomole range.
我们报道了一种反射型光子晶体光纤（PCF）干涉仪，它对不同的挥发性有机化合物（VOCs）具有高灵敏度，且无需任何可渗透材料。该干涉仪结构紧凑、坚固，由一段与标准光纤熔接的光子晶体光纤短截线组成。在熔接处，光子晶体光纤的空隙完全塌陷，从而允许两种纤芯模式的激发和复合。该器件的反射光谱呈现出正弦干涉图样，当光子晶体光纤的空隙被VOC分子渗透时，图样会发生不同的偏移。导致偏移的空隙体积小于600皮升，而可检测水平在纳摩尔范围内。
