Vallejo Felipe A, Hayden L Michael
Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA.
Opt Express. 2013 Mar 11;21(5):5842-58. doi: 10.1364/OE.21.005842.
We use coupled mode theory, adequately incorporating optical losses, to model ultra-broadband terahertz (THz) waveguide emitters (0.1-20 THz) based on difference frequency generation of femtosecond infrared (IR) optical pulses. We apply the model to a generic, symmetric, five-layer, metal/cladding/core waveguide structure using transfer matrix theory. We provide a design strategy for an efficient ultra-broadband THz emitter and apply it to polymer waveguides with a nonlinear core composed of a poled guest-host electro-optic polymer composite and pumped by a pulsed fiber laser system operating at 1567 nm. The predicted bandwidths are greater than 15 THz and we find a high conversion efficiency of 1.2 × 10(-4) W(-1) by balancing both the modal phase-matching and effective mode attenuation.
我们使用耦合模理论，并充分考虑光学损耗，来对基于飞秒红外（IR）光脉冲差频产生的超宽带太赫兹（THz）波导发射器（0.1 - 20 THz）进行建模。我们运用转移矩阵理论将该模型应用于一种通用的、对称的五层金属/包层/芯波导结构。我们提供了一种高效超宽带太赫兹发射器的设计策略，并将其应用于具有由极化客体 - 主体电光聚合物复合材料构成的非线性芯且由工作在1567 nm的脉冲光纤激光系统泵浦的聚合物波导。预测带宽大于15 THz，并且通过平衡模态相位匹配和有效模式衰减，我们发现转换效率高达1.2×10⁻⁴ W⁻¹。
