光子晶体光纤液体传感器过渡区光场传输特性.pdfVIP

28 4 Vol. 28 . 4 2007 4 Journal ofH arb in EngineeringU niversity Apr. 2007 关春颖, 苑立波 (哈尔滨工程大学 理学院, 黑龙江 哈尔滨 1 0001) : , . , , , , . , , ; , , ; . . : ; ; ; : TN2 3 : A : 2007) Characteristics of the transitionlayer of photonic crystal fibers used in liquid sensors GUAN Chunying, YUAN L ibo ( College of Science, H arb in Engineering Un iversity, H arb in 1 0001, China) Abs tract: In th is paper the light transm ission characteristics of total reflection photonic crystal fiber ( PCF) w ere in vestigated using the finite elementmethod, w hich is very mi portant and usefu l for liqu id fiber sensing. The double deck annular structure w as analyzed in photon ic crystal fibers injectedw ith liquid. In order to provide a theoretical mode,l mode field d istributions of PCF w ith different structuresw ere calculated, and the influences of parameters on mode area and energy distribution w ere also exam ined. The resu lts suggested that after PCF w as injected w ith liqu id, the light field of the mode spreaded first, then centralized tow ards the core. In the case of concave liqu id surfaces, themode area and energy d istribution centralized gradually w ith increasing inner- ring radius. How ever, in the case of convex liqu id surfaces, the mode area concentrated faster and the light transm ission characteristics in PCF w ere also influenced by the liqu id. K eyword s: w avegu ide optics; photonic crystal fiber; liqu id sensors; mode area , , !, . , , [ 1]