Frequency dependence of the terahertz power for GaP rib waveguides with widths of 1 mm, , , and . The inset shows SEM photograph of the -wide rib waveguide.
Measured fundamental-mode frequency as a function of waveguide width, . The solid line traces the theoretical value, and the inset shows the calculated results for the modal-dispersion relationships of the propagation mode in the rib waveguides.
The terahertz-wave output power obtained from the 300- and -wide waveguides as a function of the incident beam area, . The experimental results obtained from a bulk GaP crystal are also shown in this figure for comparison.
Conversion efficiency for terahertz-wave generation in rib waveguides with widths of 300 and . The experimental values obtained from GaP slab waveguides and GaP bulk crystal are displayed for reference.
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