Novel Inorganic/Organic Hybrid Photonics Material via Laser Assisted Molecular Beam Deposition

本提案中描述的研究旨在产生用于光子学应用的新型复合材料。提出的无机：有机杂化材料薄膜将通过激光辅助分子束沉积技术制备。将对这些薄膜进行结构、线性和非线性光学表征。该复合材料的微环境将使用有机荧光探针进行研究，其荧光峰、寿命、量子产率和各向异性高度依赖于微环境。通过测量波导损耗来评估光学质量。为了研究可用于光子学中所有光信号处理的三阶非线性光学性质，将利用飞秒激光脉冲进行克尔门、瞬态吸收和简并四波混频的组合。此外，我们还研究了平面光波导结构和法布里-珀罗腔模式下的三阶非线性光学过程。对于二阶非线性光学研究，将通过极化过程在制备的薄膜中引入必要的极性结构。本文将研究二阶非线性光学材料的二次谐波产生和电光调制。当前材料科学的前沿领域是开发新型高性能多功能材料，用于新兴的最先进技术，如光子学，生物光子学和光电子学。本文提出了一种利用激光辅助分子束沉积技术制备新型无机：有机杂化光子学材料薄膜的新方法。该技术制备的新型无机：有机杂化材料将无机物的高光学质量和环境稳定性与有机物的快速和大非线性光学响应相结合。激光辅助分子束沉积制备无机有机复合材料的方法是非常独特的，因为它涉及到有机蒸汽直接低温播种到由激光烧蚀产生的无机氧化物的分子束膨胀中。薄膜直接生长在位于分子束路径下游的所需底物上。＊＊＊

9526024 Prasad The research described in this proposal is designed to generate novel composite materials for photonics applications. Thin films of the proposed inorganic:organic hybrid materials will be fabricated via the laser assisted molecular beam deposition technique. The structural, linear and nonlinear optical characterization of these films will be conducted. The microenvironment of the composite will be investigated using organic fluorescent probes whose fluorescent peak, lifetime, quantum yield and anisotropy are highly dependent on the microenvironment. The optical quality will be evaluated by measuring the waveguide losses. For the investigation of the third-order nonlinear optical properties, which can be used for all optical signal processing in photonics, a combination of Kerr gate, transient absorption and degenerate four-wave mixing will be performed using femtosecond laser pulses. Also, the third- order nonlinear optical processes will be studied in planar optical waveguide configuration and in the Fabry-Perot cavity mode. For second order nonlinear optical investi- gations, necessary polar structure will be introduced in the fabricated films via the poling process. The second-order nonlinear optical materials will be studied using both second harmonic generation and electro-optic modulation. %%% A frontier area of current material science is the development of novel high performance mutifunctional materials for the application of emerging state-of-the-art technologies such as photonics, biophotonics and optoelectronics. A novel approach is presented in this proposal for the fabrication of thin films of a new class of inorganic:organic hybrid materials for photonics via laser assisted molecular beam deposition. The proposed novel inorganic:organic hybrid materials produced by this technique combine the high optical quality and environmental stability of inorganics with the fast and large nonlinear optical response of organics. The laser as sisted molecular beam deposition approach of generating inorganic:organic composites is highly unique in that it involves direct low temperature seeding of an organic vapor into a molecular beam expansion of the inorganic oxide produced by laser ablation. Films are grown directly on a desired substrate which is situated downstream in the path of the molecular beam. ***