Figi Harry, Jazbinsek Mojca, Hunziker Christoph, Koechlin Manuel, Günter Peter
Nonlinear Optics Laboratory, Institute of Quantum Electronics, ETH Zurich, Zurich, Switzerland.
Opt Express. 2008 Jul 21;16(15):11310-27. doi: 10.1364/oe.16.011310.
Organic nonlinear optical materials have proven to possess high and extremely fast nonlinearities compared to conventional inorganic crystals, allowing for sub-1-V driving voltages and modulation bandwidths of over 100 GHz. Compared to more widely studied poled electro-optic polymers, organic electro-optic crystals exhibit orders of magnitude better thermal and photochemical stability. The lack of available structuring techniques for organic crystals has been the major drawback for exploring their potential for photonic structures. Here we present a new approach to fabricate high-quality electro-optic single crystal waveguides and nanowires of configurationally locked polyene DAT2 (2-(3-(2-(4-dimethylaminophenyl)vinyl)-5,5-dimethylcyclohex-2-enylidene)malononitrile). The high-index-contrast waveguides (delta(n) = 0.54 +/- 0.04) are grown from the melt between two anodically bonded borosilicate glass wafers, which are structured and equipped with electrodes prior to bonding. Electro-optic phase modulation is demonstrated for the first time in the non-centrosymmetric DAT2 single crystalline channel waveguides at a wavelength of 1.55 microm. We also show that this technique in combination with DAT2 material allows for the fabrication of single-crystalline nanostructures inside large-area devices with crystal thicknesses below 30 nm and lengths of above 7 mm.
与传统无机晶体相比，有机非线性光学材料已被证明具有高且极快的非线性特性，可实现低于1伏的驱动电压和超过100吉赫兹的调制带宽。与研究更为广泛的极化电光聚合物相比，有机电光晶体在热稳定性和光化学稳定性方面表现出好几个数量级。缺乏适用于有机晶体的结构化技术一直是探索其在光子结构方面潜力的主要障碍。在此，我们提出一种新方法来制造高质量的电光单晶波导以及构型锁定多烯DAT2（2-(3-(2-(4-二甲基氨基苯基)乙烯基)-5,5-二甲基环己-2-亚基)丙二腈）的纳米线。高折射率对比度的波导（Δn = 0.54 ± 0.04）是在两个阳极键合的硼硅酸盐玻璃晶片之间通过熔体生长而成，这两个晶片在键合之前进行了结构化处理并配备了电极。首次在非中心对称的DAT2单晶通道波导中于1.55微米波长处展示了电光相位调制。我们还表明，这种技术与DAT2材料相结合，能够在大面积器件中制造晶体厚度低于30纳米且长度超过7毫米的单晶纳米结构。
