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(a) Calculated fundamental mode at the pump wavelength . White lines outline the waveguide’s structure. (b) Calculated fundamental mode at the SHG wavelength . The insets are the measured modes.
Scanning electron microscopy (SEM) image of the fabricated device. The insets are (a) magnified SEM image of the device and (b) a optical microscope image of the fiber coupling to the waveguide.
SHG efficiency vs pump wavelength. The theoretical prediction for 50 grating cycles—blue line, and the experimental results—red line with circles indicating the actual measured points. The inset shows normalized SH efficiency measurements with a similar waveguide without the perturbation.
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