A liquid crystal (LC) core waveguide has been designed and fabricated using nanocolloid of the nematic liquid crystal 5CB, doped with TiO2 nanoparticles, as the core. Nematic liquid crystals doped with small amount of nanoparticles can have significantly altered electro-optic response. The performance of the fabricated LC core waveguide as an optical-switch has been studied, and the experimental result shows that the threshold voltage for switching is reduced from 1 V to 0.25 V due to TiO2 nanoparticle dopant-concentration of 2.0 wt.%. The overall optimal performance of the waveguide switch, in terms of threshold voltage, extinction ratio, and response time, is achieved for a dopant-concentration of 0.5 wt.%.
- Dielectric anisotropy
- Electro-optical waveguide devices
- Liquid crystal devices
- Optical switching devices
- Titanium dioxide nanoparticles