Design of Polymethine Dyes with Large Third-Order Optical Nonlinearities and Loss Figures of Merit
Design of Polymethine Dyes with Large Third-Order Optical Nonlinearities and Loss Figures of Merit
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DOI：
10.1126/science.1185117
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发表时间：
2010-03-19
期刊：
影响因子：
56.9
通讯作者：
Marder, Seth R.
中科院分区：
文献类型：
--
作者：
Hales, Joel M.;Matichak, Jonathan;Marder, Seth R.
全光开关应用要求材料具有大的三阶非线性和低的非线性光学损耗。我们提出了一种设计方法，涉及到提高的真实的部分的三阶极化率（伽马）的菁类分子通过纳入极化硫族元素原子到终端基团，同时控制分子长度，以获得有利的单光子和双光子吸收共振，导致适当的低光损耗和可观的色散增强的真实的部分的伽马。我们实现了这一战略中的可溶性双（硒代吡喃）七甲川染料，表现出的真实的部分的伽马是非常大的整个用于电信的波长范围内，和一个虚部的伽马，非线性损耗的措施，这是小两个数量级。这种组合对于实现低功耗、高对比度光开关至关重要。
All-optical switching applications require materials with large third-order nonlinearities and low nonlinear optical losses. We present a design approach that involves enhancing the real part of the third-order polarizability (gamma) of cyanine-like molecules through incorporation of polarizable chalcogen atoms into terminal groups, while controlling the molecular length to obtain favorable one-and two-photon absorption resonances that lead to suitably low optical loss and appreciable dispersion enhancement of the real part of gamma. We implemented this strategy in a soluble bis(selenopyrylium) heptamethine dye that exhibits a real part of gamma that is exceptionally large throughout the wavelength range used for telecommunications, and an imaginary part of gamma, a measure of nonlinear loss, that is smaller by two orders of magnitude. This combination is critical in enabling low-power, high-contrast optical switching.