Edge-Coupled Terahertz Photomixer Sources for On-Chip Sensing Applications

The waveguiding properties of a multilayer dielectric slab waveguide structure with applications in edge-coupled terahertz photomixer sources are studied. The structure guides two interfering laser beams, which their central frequency difference falls into the terahertz spectrum. The top layer of the dielectric waveguide structure is made of an ultra-fast photoab-sorbing material, wherein the power of the guided modes are being absorbed and converted into a terahertz signal. The optical field and power distributions inside the waveguide structure are studied for different physical parameters of the dielectric layers. The generated terahertz photocurrent and terahertz power inside the photoabsorbing layer are calculated.