基于微結構光纖的新型功能器件、異質兼容結構與光電子集成2013年度進展報告

劉艷格　張霞　王志　張昊　周文遠

摘 要：該年度的主要研究內容和預期目標，開展了大量的理論和實驗研究工作，該報告中包含的主要研究成果如下：（1）研究了一種簡化空芯微結構光纖的傳導機制和模式特性，揭示了其傳導機理。將熒光（激光）染料填充并復合到了空芯光纖的中心孔中，并結合光纖側面探測技術提出了一種高靈敏度的、空間分辨的熒光探測技術，實現的濃度探測極限達1pM，較傳統方法提高一個數量級以上，為目前報道的光纖基同類技術中的最好值。成果詳見Applied Physics Letters 102，011136（2013）。（2）理論分析了選擇性填充不同折射率的高折射率功能材料以及不同的選擇性填充結構的微結構光纖的模式耦合特性及模式雙折射特性，揭示了纖芯模式與高折射率柱模式的耦合特性對光纖雙折射特性的調控，實現了具有獨特雙折射特性的微結構光纖。實現了不同選擇性填充結構的高折射率功能材料填充的微結構光纖，實驗研究了其Sagnac干涉儀傳輸光譜和傳感特性，揭示了具有不同群雙折射特性的微結構光纖Sagnac干涉儀不同的光譜和傳感特性，以及傳感靈敏度對波長和溫度的強烈依賴性，實現了在56.5 °C時高達-45.8 nm/°C（112，531 nm/RIU）的溫度（折射率）靈敏度，以及19.6 nm/N軸向拉力靈敏度。

關鍵詞：微結構光纖 功能器件 異質兼容結構 光子晶體光纖

Abstract：According to the main research topics and expectations of the mission statement for this year， we carried out a lot of theoretical and experimental studies， the main findings of the report include the following：（1）The conduction mechanism and mode characteristics of a simplified hollow-core microstructure optical fiber have been investigated and revealed. A high efficiency fluorescence measurement technology based on the simplified hollow-core microstructure optical fiber and lateral side detection approach has been demonstrated. A highlighted sensitivity with dye concentrations down to 1 pM is achieved， which is the best value in the reported to our best knowledge.（2）The mode coupling and modal birefringence characteristics of various types of the high-index-filled MOFs with different selective filling configurations and different materials have been theoretically investigated. Sensors with ultrahigh sensitivity based on the Sagnac interferometer using this type of birefringence fiber has been proposed and demonstrated.（3）A twin-resonance-coupling phenomenon in a selectively single-hole fluid-filled microstructure optical fiber have been proposed， demonstrated and investigated. Sensitivities of 290 nm/°C （739，796 nm/RIU） and 591.84 nm/N （701.2 pm/με） are achieved， which are the highest for a fiber-based device to date to our best knowledge.（4）A fluid-filled two-mode photonic crystal fiber （PCF）-based intermodal interferometer have been demonstrated and investigated.（5）We have reported on the fabrication and resonance mechanism of a fiber Bragg grating （FBG） with multiple resonances in a two-dimensional waveguide array microstructured optical fiber. Simultaneous measurement results of curvature and axial strain have also demonstrated.（6）The acousto-optic mode coupling in grapefruit microstructured optical fibers （GMOFs） has been investigated and unequal acoustic modulation is generated， and orthogonal acoustic gratings come into being in the GMOF.（7）We have demonstrated the formation of an acoustic grating in a simplified hollow-core photonic crystal fiber. （8）We have investigated the modal characteristics of a square fiber.An all-fiber twist sensor with low temperature sensitivity and a compact magnetic field sensor have been proposed and fabricated. Additionally， we have also investigated some of nonlinear characteristics in microstructure optical fibers and describe some of the results.

Key Words：Microstructural optical fibers functional devices；Heterogeneous compatible structure；Photonics crystal fibers

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