Silicon-organic hybrid phase shifter based on a slot waveguide with a liquid-crystal cladding

Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT), Germany.
Optics Express (Impact Factor: 3.49). 07/2012; 20(14):15359-76. DOI: 10.1364/OE.20.015359
Source: PubMed


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.

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    • "Using slot waveguides covered with a nonlinear organic cladding, high-data rate all-optical signal processing has been demonstrated [10], [11]. Also, energy-efficient liquid crystal phase shifters [12] and high-speed modulation exploiting the ultrafast Pockels effect [5]–[8] take advantage of slightly modified so-called Bstriploaded[ slot waveguides [see Fig. 1(c)]. These n-doped strips adjacent to the rails provide an electrical connection to RF transmission lines, "
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