Article

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: 3.59). 07/2012; 20(14):15359-76. pp.15359-76
Source: PubMed

ABSTRACT 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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Keywords

DC bias
 
dense integration
 
drive voltage
 
efficient phase shifter
 
LC
 
LC phase shifters
 
optimum operation point
 
phase shift
 
record-low voltage-length product
 
silicon slot waveguide
 
state-of-the-art thermo-optic devices
 
voltage-length product
 

Joerg Pfeifle