Pfeifle Joerg, Alloatti Luca, Freude Wolfgang, Leuthold Juerg, Koos Christian
Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT), Germany.
Opt Express. 2012 Jul 2;20(14):15359-76. doi: 10.1364/OE.20.015359.
A highly efficient phase shifter based on the silicon-organic hybrid (SOH) platform is theoretically investigated and experimentally tested. The device consists of a silicon slot waveguide covered with an organic liquid-crystal (LC) cladding. A record-low voltage-length product of U(π)L = 0.085 Vmm can be achieved for high-purity materials where an optimum operation point can be set by a DC bias. With standard materials and without a DC bias, we measure a phase shift of 35π with a drive voltage of only 5 V for a 1.7 mm long device corresponding to a voltage-length product of U(π)L = 0.24 Vmm. The power dissipation is about six orders of magnitude smaller than that of state-of-the-art thermo-optic devices, thereby enabling dense integration of LC phase shifters in advanced photonic integrated circuits.
对基于硅有机混合（SOH）平台的高效移相器进行了理论研究和实验测试。该器件由覆盖有有机液晶（LC）包层的硅槽波导组成。对于高纯度材料，可实现创纪录的低电压长度乘积U(π)L = 0.085 V·mm，其中可通过直流偏置设置最佳工作点。使用标准材料且无直流偏置时，对于一个1.7 mm长的器件，在仅5 V的驱动电压下我们测得相移为35π，对应电压长度乘积U(π)L = 0.24 V·mm。其功耗比现有最先进的热光器件小约六个数量级，从而能够在先进光子集成电路中实现液晶移相器的密集集成。
