Lin Tzung-Yi, Hsiao Fu-Chen, Jhang Yao-Wun, Hu Chieh, Tseng Shuo-Yen
Department of Photonics, National Cheng Kung University, Tainan, Taiwan.
Opt Express. 2012 Oct 8;20(21):24085-92. doi: 10.1364/OE.20.024085.
A shortcut to adiabatic mode conversion in multimode waveguides using optical analogy of stimulated Raman adiabatic passage is investigated. The design of mode converters using the shortcut scheme is discussed. Computer-generated planar holograms are used to mimic the shaped pulses used to speed up adiabatic passage in quantum systems based on the transitionless quantum driving algorithm. The mode coupling properties are analyzed using the coupled mode theory and beam propagation simulations. We show reduced device length using the shortcut scheme as compared to the common adiabatic scheme. Modal evolution in the shortened device indeed follows the adiabatic eigenmode exactly amid the violation of adiabatic criterion.
研究了利用受激拉曼绝热通道的光学类比在多模波导中实现绝热模式转换的捷径。讨论了使用该捷径方案的模式转换器的设计。基于无跃迁量子驱动算法，利用计算机生成的平面全息图来模拟用于加速量子系统中绝热通道的成形脉冲。使用耦合模理论和光束传播模拟来分析模式耦合特性。我们表明，与普通绝热方案相比，使用捷径方案可缩短器件长度。在违反绝热准则的情况下，缩短后的器件中的模式演化确实精确地遵循绝热本征模式。
