Nonlinear Optics in Single Crystal Waveguides of Organic Second and Third Order Optical Materials

该补助金的目标是：（一） 单晶薄膜的制备， 特定的波导微结构 有机二阶和三阶光学 材料，ii）非线性的研究 光学研究将包括相位匹配 二阶光波导与时间 波长分辨非线性 折射率测量第三 订购光波导。 两个人的作用 光子激发增强 三阶非线性将是 详细调查。 特异性缀合的 聚合物如聚二乙炔， 已知具有极大非线性 折射率沿着低 非共振吸收系数 域 如此大的非线性是 只有当聚合物链是 组织成单晶体。 具体 有机分子晶体， 硝基苯胺具有非常大且稳定的 二阶非线性， 在许多应用中使用，（例如，的shg 红外二极管激光器），如果是单晶薄膜 并且可以制备波导。 一 方法（>剪切方法>），我们有 最近建立的将用于 这些单晶膜的制备 光学材料 随后具体 波导微结构将 由电影制作。 非线性 薄膜中的光学测量， 波导将使用 既定程序。 正如最近 测量表明，单晶 聚二乙炔波导是高度 有望在全光学领域应用 开关和逻辑门 在亚皮秒的时间尺度上。 类似地 预期各种其它应用可 有机单晶波导 二阶光学材料 的 建议的研究对于 基本理解本 非线性的机制， 实现这些的实际应用 材料.

The objective of this grant are: (i) preparation of single crystal films and waveguide microstructures of specific organic second and third order optical materials, ii) studies of the off-nonlinear optical studies will include phase matched second order optical waveguides and time and wavelength resolved nonlinear refractive index measurements for the third order optical waveguides. The role of two photon excitation in the enhancement of the third order nonlinearities will be investigated in detail. Specific conjugated polymers such as polydiacetylenes are known to have extremely large nonlinear refrafctive indices along with low absorption coefficients in the off-resonant domain. Such large nonlinearities are obtained only if the polymer chains are organized as a single crystal. Specific organic molecular crystals such as nitroanilines have very large and stable second order nonlinearities which can be utilized in many applications, (e.g., SHG of infrared diode lasers), if single crystal films and waveguides can be prepared. A method (>shear method>) that we have recently established will be utilized for the preparation of single crystal films of these optical materials. Subsequently specific waveguide microstructures will be prepared from the films. The nonlinear optical measurements in the films and waveguides will be performed using established procedures. As recent measurements have shown, single crystal polydiacetylene waveguides are highly promising for applications in all-optical switches and logic gates that will operate at the subpicosecond time scale. Similarly various other applications are expected of single crystal waveguides of organic second order optical materials. The research as proposed is important for fundamental understanding of the mechanisms of the nonlinearities and realizing practical applications of these materials.